Experimental and Numerical Study of Nozzle Plume Impingement on Spacecraft Surfaces
AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
Pagination or Media Count:
An experimental and numerical effort was undertaken to assess the effects of a cold gas To300K nozzle plume impinging on a simulated spacecraft surface. The nozzle flow impingement is investigated experimentally using a nano-Newton resolution force balance and numerically using the Direct Simulation Monte Carlo DSMC numerical technique. The Reynolds number range investigated in this study is from 0.5 to approximately 900 using helium and nitrogen propellants. The thrust produced by the nozzle was first assessed on a force balance to provide a baseline case. Subsequently, an aluminum plate was attached to the same force balance at various angles from 0 degrees parallel to the plume flow to 10 degrees. For low Reynolds number helium flow, a 16.5 decrease in thrust was measured for the plate at 0 degrees relative to the free plume expansion case. For low Reynolds number nitrogen flow, the difference was found to be 12. The thrust degradation was found to decrease at higher Reynolds numbers and larger plate angles.
- Fluid Mechanics
- Statistics and Probability
- Rocket Propellants