CFD Tools for Design and Simulation of Transient Flows in Hypersonic Facilities
QUEENSLAND UNIV BRISBANE (AUSTRALIA)
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Shock tunnels and expansion tubes are our tools of choice for producing high-enthalpy flows in aerothermodynamic studies relevant to hypersonic flight. The detailed flow in these machines turns out to be quite complex and computer models are needed to completely and accurately describe the experimental flow properties and to diagnose the gas dynamic behaviour of the machine when developing new operating conditions. We describe a couple of the flow simulation codes that we have written to assist us in our experimental work. The first is a quasi-one-dimensional flow code that is capable of modelling entire free-piston driven facilities, albeit with some significant limitations. The second is a finite-volume flow code that can more accurately capture the strong viscous and thermochemical interactions that affect strongly expanding flows that are an operating characteristic of expansion tube facilities. Some application studies are then described.