Gasdynamic approach to small plumes computation
- Israel Atomic Energy Commission, Soreq Nuclear Research Centre, Yavne (Israel) Technion - Israel Inst. of Technology, Haifa (Israel)
The semi-inverse marching characteristics scheme SIMA was extended to treat rotational flows; it is applied to computation of free plumes, starting out from non-uniform nozzle exit flow that reflects substantial viscous effects. For lack of measurements of exit flow in small nozzles, the exit plane flow is approximated by introducing a Power Law Interpolation (PLI) between the exit plane center and lip values. Exit plane flow variables thus approximated, are Mach number, pressure, flow angle and stagnation temperature. This choice is guided by gasdynamic considerations of exhaust flow from small nozzles into vacuum. The PLI is adjusted so as to obtain a match between computations and measurements at intermediate range from the nozzle. Computed plumes were found to be in good agreement with five different sets of small plume experiments. Comparative computations were performed using two alternate methods: the Boynton-Simons point-source approximation, and SIMA computation that started out from a uniform exit flow. It is demonstrated that for small nozzles having an exit flow dominated by viscous effects, the combined SIMA/PLI computational method is reasonably accurate and is dearly superior to either of the two alternate methods. 14 refs.
- OSTI ID:
- 5929534
- Report Number(s):
- AIAA-Paper-93-2799; CONF-930714-
- Resource Relation:
- Conference: 11. international computational fluid dynamics conference, 28th thermophysics conference and 24th fluid dynamics, plasma dynamics and laser conference, Orlando, FL (United States), 5-7 Jul 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FLUID FLOW
COMPUTERIZED SIMULATION
NOZZLES
GAS FLOW
MACH NUMBER
NUMERICAL SOLUTION
PLUMES
VISCOUS FLOW
SIMULATION
VELOCITY
420400* - Engineering- Heat Transfer & Fluid Flow
990200 - Mathematics & Computers