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2021-7-8 · the nozzle with the spray atomization properly. Different turbulent and cavitating conditions inside the injection holes subsequently result in different spray structures and cone angles near the nozzle exit. 1.1. Specific objectives and simulation approach The objective of this paper is to investigate the effect the nozzle geometry has on the
Get Price2019-2-1 · Nozzle geometry does have a significant impact of nozzle performance. Effect of single-phase air flow through a nozzle revealed the effect of different nozzle parameters on nozzle performance. A lower diverging angle and no elongated throat gave the best critical pressure ratio and a low pressure drop.
Get Price2017-8-1 · On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets. UoM ... Increasing the jet velocity increases both the efficiency (in terms of mass flow) and effectiveness. However, as the jet velocity exceeds the speed of sound, shock structures form which cause the jet to separate. ... the usefulness of an adaptive nozzle geometry for ...
Get Price2018-12-1 · A single nozzle was placed below the yarn formation zone andacted in a way similar to the first nozzle used in air-jet spinning. The swirling air flow inside the nozzle was capable of wrapping the protruding hairs around the yarn body, thereby reducing yarn hairiness. Subramaniana et al. used 100% cotton for producing yarn count about 20 Tex.
Get Price2021-8-25 · The result shows that the nozzle core tip's geometry has a significant influence on the internal airflow, affecting the acceleration tube airflow velocity, turbulence intensity, and backflow...
Get Price2015-4-20 · The influence of the nozzle geometry, namely, the nozzle-wall thickness d and the nozzle length L, on the vortex breakdown of compressible, swirling nozzle-jet flows is numerically investigated.The Reynolds number is set to R e = 5000 and the Mach number is M a = 0.6.The nozzle is either in rotation with the mean-flow direction or kept at rest.
Get Price2009-2-9 · Injector Nozzle Hole Parameters and their Influence on Real DI Diesel Performance Mikael Lindström Licentiate thesis Academic thesis, which with the approval of Kungliga Tekniska Högskolan, will be presented for public review in fulfillment of the requirements for a Licentiate of Engineering in Machine Design.
Get Price2020-11-3 · The influence of nozzle structure on SC-CO 2 jet coal breakage was studied and the results indicate that when the inlet pressure is constant, the Laval nozzle has a higher …
Get Price2020-10-13 · predict air-jet pump performance is formulated on the basis of fluid mechanics and a numerical solution is obtained. This model is used to predict the non-dimensional relationship between the motive, suction and discharge flow through an air-jet pump with a given geometry. The predicted performance agrees well with experimental results for
Get Price2020-10-13 · performance. For example, the no appreciable stall regime generally consists of 'well behaved' flow made up of a core surrounded by boundary layers on the walls. A model patterned in this fashion has been applied by Schlichting and Gersten (1961) and Reneau and Johnston (1967) to straight, rotationally
Get Price2017-8-1 · On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets. UoM ... Increasing the jet velocity increases both the efficiency (in terms of mass flow) and effectiveness. However, as the jet velocity exceeds the speed of sound, shock structures form which cause the jet to separate. ... the usefulness of an adaptive nozzle geometry for ...
Get Price2015-4-20 · The influence of the nozzle geometry, namely, the nozzle-wall thickness d and the nozzle length L, on the vortex breakdown of compressible, swirling nozzle-jet flows is numerically investigated.The Reynolds number is set to R e = 5000 and the Mach number is M a = 0.6.The nozzle is either in rotation with the mean-flow direction or kept at rest.
Get PriceIn the current study the effect of variations in pylon geometry on performance parameters such as flammable plume area, fuel jet penetration, mixing efficiency, total pressure loss and streamwise vorticity are investigated for a combustor inlet Mach number of 2.2 which approximates a flight Mach number of 5, at a total pressure of 4bar and ...
Get Price2017-4-14 · increases the pressure of the cooling air. Then a group of high performance finned radiators rejects the heat from coolant, air charge and lubricant. A variable geometry nozzle transforms the added enthalpy into speed and thrust. The nozzle is positioned in a low pressure, high turbulence area.
Get Price2020-10-13 · performance. For example, the no appreciable stall regime generally consists of 'well behaved' flow made up of a core surrounded by boundary layers on the walls. A model patterned in this fashion has been applied by Schlichting and Gersten (1961) …
Get Price2017-10-31 · The technique of deploying chevrons on a nozzle is gaining prominence as a passive device to reduce jet engine exhaust noise. Numerous small scale experiments in research laboratories, as well as full scale flight tests under the Quiet Technology Demonstrator (QTD) program, have established that the implementation of chevrons is an effective method to reduce turbojet engine noise.
Get Price2017-2-8 · nozzle jet ejector and is as follows A. Experimental set up 1. The experimental Setup for industry scale jet ejector is shown schematically in Figure 2. concentration and gas concentration. The results are compiled. Fig. 1 Detail of the jet ejector used in experimental setup These experiments were conducted on industrial stage
Get Price2021-3-12 · performance of an engine in a freejet test facility is - a difficult task due in part to the difficulty in determining how much air the engine is ingesting and the spillage, friction and base drag of …
Get PricePreview Abstract. In this work, the surface properties of Mg–Al–Zn (AZ91D) alloy such as surface morphology, hardness and electrochemical corrosion were studied after copper ions (Cu +) irradiation at different energies (0.8, 1.5, 2.5 and 3.5 MeV) while keeping the ion dose constant at …
Get Price2014-11-12 · The mean and fluctuating velocities of the orifice air jet were also measured using a single hot-wire and the effects of CR on them were demonstrated. It is found that the normalized centerline maximum velocity could be expressed by u c /u m = 1.9 CR 3 – 3.55 CR 2 + 1.38CR + 1.53, showing a maximum value of 1.7 at CR =0.27.
Get Pricesimple geometry jet pump was designed, developed and tested. ... system made up of several bars was designed, manufactured ... air stream nozzle diameter, shown in Fig. 1.
Get PriceIn the current study the effect of variations in pylon geometry on performance parameters such as flammable plume area, fuel jet penetration, mixing efficiency, total pressure loss and streamwise vorticity are investigated for a combustor inlet Mach number of 2.2 which approximates a flight Mach number of 5, at a total pressure of 4bar and ...
Get Price2020-7-6 · Liquid jet refers to the discharge of fluid flow from a nozzle mixing with the surrounding air after the free control of the solid boundary. Liquid jets play an important role in engineering and nature (Zare-Behtash et al., 2011 35.Zare-Behtash, H., Gongora-Orozco, N., and Kontis, K., “ Effect of primary jet geometry on ejector performance: A cold-flow investigation,” Int. J. Heat Fluid ...
Get Price2020-10-13 · performance. For example, the no appreciable stall regime generally consists of 'well behaved' flow made up of a core surrounded by boundary layers on the walls. A model patterned in this fashion has been applied by Schlichting and Gersten (1961) …
Get PriceThe shape of the nozzle geometry is increasingly attractive in heating, ventilation and air conditioning applications. The objective of the present work is to simulate and …
Get Price2009-5-13 · abrasive flow that made it possible to cut carbide efficiently was 135 g min ‐1. With increase in jet pressure the surface becomes smoother due to higher kinetic energy of the abrasives. But the surface near the jet entrance is smoother and the surface gradually becomes
Get PriceThe nozzles of moist-mix shotcrete are the key parts of forming a steady jet flow field and ensuring the uniform mixing of water and other ingredients. In this paper, for optimizing the nozzle of moist-mix shotcrete, both the internal and external field of a variety of spray nozzles were simulated and analyzed by adopting orthogonal test method with Fluent simulation software combined.
Get Price2014-6-24 · In this paper we study two cold atmospheric pressure plasma jets, operating in Ar + 2% air, with a different electrode geometry but with the same power dissipated in the plasma. The density profiles of the biomedically active NO and O species throughout the plasma jet, previously obtained by laser diagnostics, are calculated by means of a zero ...
Get Price2021-6-28 · The air jet is 1/2 the ID of the nozzle and as the air stream is passed through both, it creates a low pressure which sucks the media from the hopper into the air stream. The media acceleration distance is very short ( from the nozzle to the workpiece-approximately 4 to 14”).
Get Price2020-8-19 · The over-pressure in air boxes is 880 Pa for 8 mm glass and 7000 Pa for 4 mm glass. The distribution of the heat transfer coefficients is solved with OpenFOAM CFD (Computational Fluid Dynamics) software as in ref. [12]. The ratio of the nozzle-to-plate distance and nozzle …
Get Price2014-6-24 · In this paper we study two cold atmospheric pressure plasma jets, operating in Ar + 2% air, with a different electrode geometry but with the same power dissipated in the plasma. The density profiles of the biomedically active NO and O species throughout the plasma jet, previously obtained by laser diagnostics, are calculated by means of a zero ...
Get PriceThe nozzles of moist-mix shotcrete are the key parts of forming a steady jet flow field and ensuring the uniform mixing of water and other ingredients. In this paper, for optimizing the nozzle of moist-mix shotcrete, both the internal and external field of a variety of spray nozzles were simulated and analyzed by adopting orthogonal test method with Fluent simulation software combined.
Get Price2021-6-28 · The air jet is 1/2 the ID of the nozzle and as the air stream is passed through both, it creates a low pressure which sucks the media from the hopper into the air stream. The media acceleration distance is very short ( from the nozzle to the workpiece-approximately 4 to 14”).
Get Price2019-12-17 · expanded sootblower jet in recovery boilers. The air pressure at the nozzle inlet was 5.5Mpa. The peak impact pressure (PIP) of the jet as a function of distance between the nozzle and the deposit surface was pre-determined using a Pitot tube. It was also calculated based on the air pressure and the nozzle geometry.
Get Price2021-1-25 · In the present paper, an efficient optimization method based on Bayesian updating strategy is developed for the design of a spark-ignition engine equipped with pre-chamber. 3D computational fluid dynamics (CFD) simulation coupled with strategies including design of experiment, genetic algorithm, and machine learning methods is used to optimize the pre-chamber with desired combustion phasing.
Get Price2014-12-18 · field was made possible using polished acrylic windows as the sidewalls and an 8mm nozzle width used to minimise the influence of the wall on the flowfield. Flow through the system was provided from G size gas bottles filled with instrument grade air at a maximum pressure of 220 bar. The pressure ratio (PR)
Get Price2009-5-13 · abrasive flow that made it possible to cut carbide efficiently was 135 g min ‐1. With increase in jet pressure the surface becomes smoother due to higher kinetic energy of the abrasives. But the surface near the jet entrance is smoother and the surface gradually becomes
Get PricePreview Abstract. In this work, the surface properties of Mg–Al–Zn (AZ91D) alloy such as surface morphology, hardness and electrochemical corrosion were studied after copper ions (Cu +) irradiation at different energies (0.8, 1.5, 2.5 and 3.5 MeV) while keeping the ion dose constant at …
Get Price2019-10-4 · The length of this region depends on jet and air stream velocity as well as the viscosity of the solution. Within this region, the jet diameter is almost constant and only thinned by the loss of ...
Get Price2021-3-12 · performance of an engine in a freejet test facility is - a difficult task due in part to the difficulty in determining how much air the engine is ingesting and the spillage, friction and base drag of …
Get Price2015-10-12 · The fundamentals of these processes haven been long studied by the diesel spray community from both experimental and numerical perspectives. However, certain topics, such as the influence of nozzle geometry over the spray atomization, mixing, and combustion process, are still not completely well understood and predicted by numerical models.
Get PriceThis study investigates the influence of the nozzle geometry on the mean flow field of an annular swirling jet. The nozzle geometry consists of a sudden expansion with step size s followed by a divergent with opening angle and axial length L. The inner dimensions of the nozzle are changed via s, L and and in total 87 different nozzle geometries ...
Get PriceThe effect of nozzle geometry on the structure of a supersonic free jet is investigated both experimentally and numerically for three simple nozzle geometries. In the experiments, the relation between the Mach disk height and diameter and the nozzle pressure ratio are investigated using the schlieren method. In contrast to results obtained in previous studies, our experimental results show ...
Get Price2003-2-1 · Influences of nozzle flow and nozzle geometry on the shape and size of an air core in a hollow cone swirl nozzle M R Halder, S K Dash, and S K Som Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 2003 217 : 2 , 207-217
Get Price2019-11-10 · Influence of Nozzle Orifice Geometry and Fuel Properties on Flow and Cavitation Characteristics of a Diesel Injector 115 where p, pb, pv are the local pressure, back pressure, and vapor pressure, respectively. This criterion has been extensively used in the cavitation modeling community.
Get Price2018-10-19 · In order to determine the significance and importance order of the jet performance caused by fan nozzle's geometric parameters of aero-engine online cleaning equipment, the orthogonal experiment method, standard k–ɛ turbulence model and volume of fluid (VOF) two-phase flow algorithm are used to research the jet of fan nozzle. The sensitivity of nozzle contraction angle, nozzle area ratio ...
Get Price2019-10-10 · Investigating the influence of the jet from three nozzle and spear design configurations on Pelton runner performance by numerical simulation To cite this article: S Petley et al 2019 IOP Conf. Ser.: Earth Environ. Sci. 240 022004 View the article online for updates and enhancements.
Get PriceThe effect of nozzle configuration on the jet flow field is discussed with predicted mean flow and turbulent flow data. Near field of multiple jets shows non-linear behavior. Multiple jets show better performance in the near field based on entrainment, secondary flows and area averaged turbulent kinetic energy.
Get Price2017-3-31 · Due to having more complicated inner structural features and obvious influence on the air-jet performance arising from the acceleration tube, the structural optimization of the main nozzle for an air-jet loom is still a difficult problem. Naturally, traditional design method for the nozzle will still prolong the time of type approval and increase the design cost.
Get PriceThe characterization of flow through Pelton hydro turbines allows the optimization of their operation and maximization of energy performance. The flow in the injector of Pelton turbines and in the free jet area (the area from the injector outlet surface to the runner bucket inlet surface) is influenced by several parameters: the geometry of injector components (nozzle and injector spear), the ...
Get PriceThe sodium-cooled fast nuclear reactor (SFR) is one of the most promising designs of the fourth generation (Gen IV) nuclear power reactors. Sodium-gas heat exchangers (SGHE) using nitrogen is being investigated as an alternative to improve operational safety associated with the use of steam Rankine cycles. This alternative eliminates the potential risk of chemical reactions.
Get PriceThe influence of torch nozzle geometry on plasma jet properties is investigated using a non-equilibrium model. A code is developed to numerically solve the conservation equations of mass, momentum and energies by means of finite difference method. The distributions of pressure, temperatures, electron density and velocities are studied for different angles and lengths of plasma torch nozzle and ...
Get Price2019-10-10 · Investigating the influence of the jet from three nozzle and spear design configurations on Pelton runner performance by numerical simulation To cite this article: S Petley et al 2019 IOP Conf. Ser.: Earth Environ. Sci. 240 022004 View the article online for updates and enhancements.
Get PriceGas injectors with of different geometries and injector orifice diameters were used to spray water into air at normal atmospheric pressure and temperature to investigate the effect of gas-injector geometry on spray characteristics. It is found that, over the range of diameters from 0.8 to 2.4 mm, the injector orifice size has little effect on atomization quality.
Get Price2017-3-31 · Due to having more complicated inner structural features and obvious influence on the air-jet performance arising from the acceleration tube, the structural optimization of the main nozzle for an air-jet loom is still a difficult problem. Naturally, traditional design method for the nozzle will still prolong the time of type approval and increase the design cost.
Get PriceThe present paper describes an experimental investigation of the various parameters affecting the operation of industrial pneumatic controllers based on the jet nozzle principle. A test rig was built to monitor supply pressure, air temperature, airflow characteristics, and the static pressure distribution over the flat plate on which the jet impinges. The results demonstrate the existence of a ...
Get Price2018-6-10 · (2014). Effects of injection timing, injector opening pressure and nozzle geometry on the performance of cottonseed oil methyl ester-fuelled diesel engine. International Journal of Sustainable Engineering: Vol. 7, No. 1, pp. 82-92.
Get Price2014-12-25 · Injection Strategies: Nozzle Geometry The behaviour of fuel once it is injected in to the combustion chamber and its subsequent interaction with air is important. This is in turn helps to achieve homogeneous air-fuel mixture available for combustion. It is well known that nozzle geometry and cavitations strongly affect
Get Price2020-10-13 · performance. For example, the no appreciable stall regime generally consists of 'well behaved' flow made up of a core surrounded by boundary layers on the walls. A model patterned in this fashion has been applied by Schlichting and Gersten (1961) …
Get Price2009-5-13 · abrasive flow that made it possible to cut carbide efficiently was 135 g min ‐1. With increase in jet pressure the surface becomes smoother due to higher kinetic energy of the abrasives. But the surface near the jet entrance is smoother and the surface gradually becomes
Get Price2012-8-22 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500
Get Pricethe cooling ability of the gas jet is very important in nozzle design. However, because many factors such as the nozzle shape, arrangement, distance, header pressure and radiation influence the cooling ability, accurate prediction is difficult. Effect of Nozzle Geometry and Distance on Cooling Performance of …
Get Price2016-7-19 · pipe geometry. Only the energy saving nozzle used around 10% less mass flow and is the best solution to reduce compressed air consumption without losing performance. INTRODUCTION Compressed air is a common energy medium. In Europe 10% of …
Get PriceThe paper reports an investigation of the influence of geometric profile of a long slot nozzle on the statistical properties of a plane jet discharging into a large space. The nozzle-exit profile was varied by changing orifice-plates with different
Get Price2021-8-26 · Compatibility of the nozzle geometry (NG) and combustion chamber shape (CCS) were optimized for increased engine performance. The optimized CCS matched with an increased number of injector nozzle holes in NG showed reasonably improved brake thermal efficiency (BTE), reduced emissions of smoke, HC, and CO, respectively, while NOx increased.
Get Price2013-12-24 · Keywords: Jet Pump; Nozzle-Throat Interface; Driving Air Pressure . 1. Introduction . The jet pump is a low-pressure high volume flow rate pump. Simplicity of design, absence of any moving parts, ability to handle muddy water, reliability, ruggedness, and low cost, more than compensate for the relatively poor efficiency of the pump.
Get Price2017-3-15 · uses air as an atomizing medium in the “outside-in” gas injection configuration. Several design parameters are modified: size and number of aerator holes, their location and diameter of the mixing chamber. Influence of these parameters on the spray performance is studied at atomizing pressures 0.1, 0.3 and 0.5 MPa and GLR of
Get PriceCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract. The shape of the nozzle geometry is increasingly attractive in heating, ventilation and air conditioning applications. However an important consideration in the design of nozzle geometry is its effect on the dynamics of near flow field jet and to minimise the manufacturing cost for practical applications.
Get PriceInvestigation of Influence of Injector Opening Pressure and Nozzle Geometry on the Performance and Emission Characteristics of DI Diesel Engine with CAOME . Varun Kumar Reddy N 1,2, S. G. Sangashetty 3, Nagaraj Ramalingayya Banapurmath 4* 1 Assistant Professor, REVA University, INDIA
Get Price2014-12-25 · Injection Strategies: Nozzle Geometry The behaviour of fuel once it is injected in to the combustion chamber and its subsequent interaction with air is important. This is in turn helps to achieve homogeneous air-fuel mixture available for combustion. It is well known that nozzle geometry and cavitations strongly affect
Get Price2012-8-2 · Reynold's number of jet, nozzle to plate spacing, the presence of a confining wall, the ambient air temperature relative to the jet temperature, and jet diameter [2, 3]. The geometry of the nozzle has considerable effect on the heat transfer between the impinging jet and the plate. The nozzle geometry …
Get Price2020-9-15 · The nozzle geometry of fuel injectors has a strong influence on turbulences and pressure gradients within the nozzle flow. The flow situation at the nozzle outlet determines the spray propagation into the ambient atmosphere. This spray penetration is critical for gasoline direct injection (GDI) syst
Get PriceWe applied a stagnation pressure upstream of the crack of 180 bar while the nozzle pressure ratio (NPR) ranged from 6.0 to 9.2. We were able to identify the link between the nozzle geometry and the Mach disk diameter and its localization. The vorticity distribution at the nozzle can be used to explain the structure of the jets and the entrainment.
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Get Price2016-6-10 · Moreover, the cavitation erosion ability of the jet can be largely enhanced around the optimum standoff distance, depending on the type of area discontinuity and nozzle geometry. A preliminary analysis of the influence of area discontinuity on the disturbance waves in the flow is also performed.
Get Price2017-3-15 · uses air as an atomizing medium in the “outside-in” gas injection configuration. Several design parameters are modified: size and number of aerator holes, their location and diameter of the mixing chamber. Influence of these parameters on the spray performance is studied at …
Get PriceHowever, it was only in 2009 that the effects of a real jet on the cutting process of a complete single-injector and rotating Pelton turbine, including both the penstock and casing, were analyzed by Santolin et al. 18 Even though this analysis was able to simulate an entire working cycle of …
Get Price1997-9-1 · A test rig was built to monitor supply pressure, air temperature, airflow characteristics, and the static pressure distribution over the flat plate on which the jet impinges. The results demonstrate the existence of a low pressure, separated flow zone, subject to fouling, which subsequently was eliminated by appropriate changes of the injection ...
Get PriceThe nozzles of moist-mix shotcrete are the key parts of forming a steady jet flow field and ensuring the uniform mixing of water and other ingredients. In this paper, for optimizing the nozzle of moist-mix shotcrete, both the internal and external field of a variety of spray nozzles were simulated and analyzed by adopting orthogonal test method with Fluent simulation software combined.
Get Price2011-9-26 · In order to enhance the aggressive intensity of a cavitating jet for practical applications, the effect of the geometry of the nozzle through which the jet is driven on the aggressive intensity was investigated. The nozzle under test was cylindrical and consisted of a plate and a cap with a hole bored through it.
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