NUMERICAL SIMULATION OF HIGH-SPEED FLOWS OVER VEHICLES WITH EXTENDED EXHAUST PLUMES

摘要

Aircraft, launch vehicles and missiles thatrntravel at high altitudes have been observed tornexperience a phenomenon called Plume Induced FlowrnSeparation (PIFS) during some portion of their flightrnpath. Under certain flow conditions the exhaust plumernfrom these vehicles will cause the external flow tornseparate from the vehicle’s surface, allowing hotrnexhaust gases to recirculate into the separated regionsrnwere they were not intended, like near enginerncomponents and vehicle surfaces. As a result, vehiclernperformance can be greatly affected. A study ofrnphenomenon requires the vehicle to be operating underrnconditions that result in PIFS occurring, so that thernresulting flowfield and thermal environment about thernvehicle configuration can be observed and recorded forrnanalysis. However, methods for analytically predictingrnPIFS in this manner are not available and are greatlyrnneeded. To investigate the effects of PIFS on an AtlasrnIIIA Launch Vehicle a numerical simulation of thernvehicle during a portion of its flight when PIFS is mostrnlikely to occur has been performed. The PIFS flowfieldrnand thermal environment captured by the simulationrnwill be used to predict the occurrence, extent, andrneffects of the phenomenon on the geometry of an AtlasrnIIIA vehicle.