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Showing 1 to 20 of 23 for “"converging-diverging nozzle"”.
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Dense gas effects in a converging-diverging nozzle
… for the solution of steady inviscid flows in a converging-diverging nozzle are presented for a general fluid. The main emphasis is placed on Bethe-Zel'dovich-Thompson fluids, i.e., those having specific heats so large that the fundamental derivative of gasdynamic is negative over a finite range …
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Characterization of microparticle velocities in converging-diverging nozzle systems
… utilizes an experimental system incorporating a converging-diverging nozzle to accelerate well characterized particles to high speeds via aerodynamic drag force on the particle and measures the resulting velocities. Velocity measurements in the range of 0.3 - 1 km s-1 were taken for singularly …
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Experimental investigation of cavitation using refrigerant in a two-phase flow system
… a special test section containing a unique converging-diverging nozzle system designed for this investigation. In the end, cavitation was achieved by flowing the test fluid through a converging-diverging nozzle. As the fluid flows through the nozzle throat, the velocity increases while the …
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An application of relaxation methods to transonic nozzle flow
… 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 potential …
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Flow visualization of cavitation
… loop utilizes water flowing through a nozzle, initiating cavitation. Cavitation is generally defined as creating vapor from liquid, not through adding heat, but by decreasing the pressure. In a converging/ diverging nozzle, as the cross sectional area is constricted, the velocity of the …
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Development of an Experimental System to Generate and Characterize Supersonic Aerosol Particles Using Laser Doppler Velocimetry
… generator and accelerate the particles using a converging-diverging nozzle with both air and helium. The particle velocity is measured using a laser doppler velocimeter at various positions between the exit of the nozzle and the surface of a metal substrate and found to have a maximum mean …
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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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Transported snapshot model order reduction approach for parametric, steady-state fluid flows containing parameter dependent shocks
… to the reduction of a parametric 1-D flow in a converging-diverging nozzle, a parametric 2-D supersonic flow over a forward facing step and a parametric 2-D jet diffusion flame in a combustor.
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The effect of departure from ideality of a multiply ionized monatomic gas on the performance of rocket engines
… in solving the quasi-one-dimensional flow in a converging-diverging nozzle for the equilibrium, frozen, and nonequilibrium cases. Numerical examples, using argon as the working substance, are discussed and the results presented graphically. The results of these calculations indicate that, for …
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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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Validation of Conjugate Heat-Transfer Capability for Water- Cooled High-Speed Flows
… tunnel experiments: i) Air Force high-enthalpy nozzle test which recorded the increase in water coolant temperature, ii) Jet Propulsion Lab converging-diverging nozzle test for which nozzle and run-up were well-instrumented with thermocouples, iii) NASA Glenn Research Center experiment on a …
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Experimental assessment of the internal flow behavior of supercritical carbon dioxide
… was developed with the capability of operating a converging-diverging nozzle with a wide range of charge conditions. The test-rig demonstrated repeatable results with relative errors of less than 1 percent. An innovative method to measure the speed of sound through the use of Helmholtz resonators …
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Laser engine simulation using pressure based navier-stokes solver
… flat plate and to a flow in an axisymmetric converging-diverging nozzle. Next, the PBNS code is used to analyze the flowfield and performance of a laser thruster. The physical/numerical model includes the geometric ray tracing for the laser beam, beam power absorption, plasma radiation …
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Microjet based noise control of supersonic jets on carrier decks
… Mach 1.5, impinging jet was determined. Using a converging-diverging nozzle with a design Mach number of 1.5, the jet was operated at temperatures ranging from 60 to 1700°F. Six microjets were installed in the ground plane in a circular configuration at a radial spacing of 1.53 nozzle diameters, …
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A qualitative assessment and optimization of URANS modelling for unsteady cavitating flows
… modelling to simulate cavitating flow in a converging-diverging nozzle.
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Extension of the finite volume method to laminar and turbulent flow
… in the calculations. Transonic viscous flow in a converging diverging nozzle is calculated with the method; the Mach number upstream of the shock is approximately 1.25. The agreement between the calculated and measured shock strength and total pressure losses is good. Essentially incompressible …
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The Design and Implementation of a Supersonic Indraft Tube Wind Tunnel for the Demonstration of Supersonic Flows
… and moderate cost required for driver tube and nozzle hardware can make it difficult to implement for many non-research universities.</p> <p>In this thesis, a new supersonic test system architecture is conceived, designed, implemented, and validated for the purpose of making supersonic …
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The Effect of Thermal Non-Uniformity on Coherent Structures in Supersonic Free Jets
… with little modification to the engine and nozzle. Prior work has shown that total temperature non-uniformity is a noise reduction technique which introduces a stream of cold flow into the heated jet. This method has been shown to cause changes in the exhaust plume and result in a 2±0.5 dB …
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Rayleigh Flow of Two-Phase Nitrous Oxide as a Hybrid Rocket Nozzle Coolant
… routed around the throat of the hybrid rocket’s converging-diverging nozzle as a coolant. While this coolant system has proven effective empirically in previous tests, the physics behind the flow of the two-phase mixture is largely unexplained. This thesis provides a method for predicting some of …
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Kavitující proudění v konvergentně-divergentní trysce
Diplomová práce se zabývá kavitujícím prouděním vyvolaným rotací kapaliny v konvergentně-divergentní trysce, která simuluje vírový cop za oběžným kolem vodní turbíny. Je provedeno měření na experimentální trati v laboratoři. Výsledky z experimentálního měření jsou srovnávány s CFD výpočty při …
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