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Showing 1 to 20 of 24 for “"Nozzle flow"”.
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Nozzle Flow with Vibrational Nonequilibrium
<p>Flow of nitrogen gas through a converging-diverging nozzle is simulated. The flow is modeled using the Navier-Stokes equations that have been modified for vibrational nonequilibrium. The energy equation is replaced by two equations. One equation accounts for energy effects due to the …
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An application of relaxation methods to transonic nozzle flow
… techniques to the solution of transonic flow in a converging - diverging nozzle is presented. The assumptions of steady, isentropic flow of a perfect gas were made. Successive line relaxation, similar to that of Garabedian and Korn, was employed in a transformed computational plane. The …
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A relaxation method for the solution of rotational transonic nozzle flow
… pressure gradients in evaluating propulsion nozzle performance. In fact, in the cases considered here inlet flow nonuniformities produced effects greater than those which resulted from a consideration of just the two-dimensionality of the flow. For the hyperbolic nozzle and the turbofan …
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Investigation of in-nozzle flow characteristics of fuel injectors of IC engines
… some form of cavitation within their nozzle under different operating conditions. In-nozzle cavitation initiates in various forms and directly influences the emerging spray. Experimental studies have shown that cavitation in diesel injectors leads to smaller droplet formation, …
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A Study of Nozzle-Flow Problems by the Method of Integral Relations
Made available in DSpace on 2014-12-10T22:48:16Z (GMT). No. of bitstreams: 1 7309951.pdf: 2590367 bytes, checksum: fe7a890ed053d0e60500316222e5f4a2 (MD5) Previous issue date: 1972
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Multihole injectors for direct-injection gasoline engines
High-pressure multi-hole nozzles, carrying a Diesel-derived technology, are believed to be promising Fuel Injection Equipment (FIE) for Direct-Injection (DI) Spark Ignition (SI) gasoline engines. Having explored thoroughly swirl pressure atomisers and their spray behaviour, multi-hole nozzles …
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Automatic Control of Chemical Application Rate With Soil Organic Matter and Travel Speed as Inputs (Microprocessor, Digital Control)
… matter content and sprayer ground speed. Bypass nozzles were used to maintain uniform spray characteristics over a wide range of flow rates. The application rate was controlled by regulating the pressure of the bypass line with a pressure relief valve controlled by a step motor. The major …
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A CFD Investigation of Axisymmetric Microthruster Nozzles for Use on Nano-Satellites
<p>The performance of microthruster nozzles (^ 0.1 N thrust) depending on nozzle contour, propellant and surroundings, destined for use in nanosatellite missions, is investigated via a numerical approach using the Wind-US flow solver. An experimental apparatus designed to measure microthruster …
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Vortex control of two-phase refrigerant flow in nozzles and its application in ejector vapor compression cycles
… is a novel two-phase convergent-divergent nozzle restrictiveness control mechanism which achieves flow control by adjustable nozzle inlet vortex strength. The nozzle can become more restrictive with increasing inlet vortex strength. Vortex control can potentially provide flow control with …
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A theoretical study of the performance of resistojet nozzles
… of four computer models of resistojet nozzle performance is reported. Five main energy loss processes are accounted for; these are (i) frozen chemical rate processes, (ii) finite rate vibrational relaxation, (iii) incomplete expansion, (iv) viscous flow and (v) radial flow.<br/><br/>The …
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Measurement of the efficiency of a flashing flow nozzle
The efficiency of a flashing flow converging-diverging nozzle was measured. The primary motivation for measurement of nozzle efficiency in this work was to improve the performance of an ejector as a refrigerant expander; previous experimentation has suggested that motive nozzle efficiency is poor. …
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Conceptual evaluation of hydrogen hybrid combustion for heavy-duty engines using CFD modelling
… focusing on parameters such as the number and flow area of pre-chamber nozzles, pre-chamber volume, and the implementation of a dual injector setup. A simplified valveless model and a detailed single-cylinder model were used to analyse flow and combustion characteristics at a fixed engine …
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Characterization and Analysis of Supersonic Flow Through De Laval Nozzles at Varied Design Conditions
… experimental investigation of supersonic planar nozzles under different design conditions has been conducted. Supersonic planar nozzles are common geometries observed in supersonic wind tunnels and aircraft or rocket engines. For the important role they play in wind tunnel testing and aircraft …
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Modeling, simulation, and fabrication of a PZT valveless micropump
… solutions with particles. Diffuser and nozzle elements direction dependent flow characteristics are quantitatively studied and summarized. From diffuser and nozzle flow characteristics, the working principle of the valveless micropump is presented. Based on fluidic mechanics and solid …
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New efficient contact discontinuity capturing techniques in supersonic flow simulations
… problem, triple point problem and underexpanded nozzle flow. Underexpanded nozzle flow involves complex interaction of free surface, shock waves and slip lines. Traditional high-order schemes smear the contact surfaces preventing accurate definition of the flow structure inside the jet. However, …
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Simulations And Experiments Of Fuel Injection, Mixing And Combustion In Di Gasoline Engines
… system, such as air-fuel mixing, in-cylinder flow development, surface wetting, and turbulence intensity. The characterizations of the internal nozzle flow of DI injector are first studied using the multidimensional computational fluid dynamic (CFD) simulation. In the meanwhile the numerical …
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Computational modeling of fiber reinforced composites melt flow in nozzle extrudate for polymer deposition additive manufacturing.
… finite element method is applied to solve the flow kinematics and free surface shape of the nozzle-extrudate polymer melt that is defined by generalized Newtonian and viscoelastic flow models. The Folgar-Tucker Isotropic Rotary Diffusion (IRD) model and the Reduced Strain Closure (RSC) model …
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Maintaining Functionality of Biological Materials during Fluid–based Manufacturing
… ancillary equipment, printhead choice, nozzle flow, droplet formation and drying are examined in isolation. Techniques that are more controlled than previously reported are used to determine protein activity losses for each element to assess the contribution from each stage of printing. …
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The development of dedicated CFD solver for aerodynamic analysis on internal and external flow
… one has to solve an internal or an external flow problem. The design of flying vehicles such as aircraft, helicopter, missiles are examples which the ability to solve an external flow problem will determine the success in designing such flying vehicles. While for the case of flows pass …
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Comprehensive throughflow method for steam turbine development
Wetness formation in condensing nozzle flow has been well researched and very good agreement has been achieved between theory and experimental measurements. However, condensation in steam turbines is much more complex and optical measurements show a much broader droplet spectrum than in nozzles and …
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