منابع مشابه
Instability of supersonic compression ramp flow.
The instability of supersonic compression ramp flow is investigated. It is assumed that the Reynolds number is large and that the governing equations are the unsteady triple-deck equations. The mean flow is first calculated by solving the steady equations for various scaled ramp angles α, and the numerical results suggest that there is no singularity for increasing ramp angles. The stability of...
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A numerical analysis is carried out to determine the flowfield and starting characteristics of a straight cylindrical supersonic exhaust diffuser of a high-altitude simulation of a high expansion ratio rocket nozzle. The flow field inside the high-altitude facility is analyzed for a conical nozzle of expansion ratio of 25, diffuser inlet-to-nozzle throat area ratio of 28.9, and diffuser length-...
متن کاملSimulation of Supersonic Flow in an Ejector Diffuser Using the JPVM
The ejectors are used commonly to extract gases in the petroleum industry where it is not possible to use an electric bomb due the explosion risk because the gases are flammable. The steam ejector is important in creating and holding a vacuum system. The goal of this job is to develop an object oriented parallel numerical code to investigate the unsteady behavior of the supersonic flow in the e...
متن کاملInstability of supersonic ramp flow with intermittent transition to turbulence
This paper investigates the global instability of supersonic ramp flow at Mach number 4.8 at different Reynolds numbers through direct numerical simulations. It is found that a critical Reynolds number exist for the flow to become globally unstable. Transition to turbulent happens downstream of the ramp with strong intermittency and is due to the breakdown of streaky structures fed by instabili...
متن کاملDesign of Pneumatic Diffuser System
During non-generation periods, leakage through the wicket gates of a hydroturbine often results in very poor quality water (low or zero dissolved oxygen) in the tailrace of the hydropower facility. Generally, the leakage rate is relatively small, usually about 5-10 cfs per turbine. A bottom-mounted diffuser system was designed based on laboratory-measured and manufacturer-supplied specification...
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ژورنال
عنوان ژورنال: Journal of the Aeronautical Sciences
سال: 1955
ISSN: 1936-9956
DOI: 10.2514/8.3452