Substitution of Hot-Gas Lateral Jets by Cold-Gas Jets in Supersonic Flows

摘要

The supersonic flow around a rocket piloted by thrusters has been investigated. Steady Reynolds-averagednNavier–Stokes computations and pressure measurements in a wind tunnel, using pressure taps and pressure-nsensitive paint, have been performed. For experimental investigations, real hot-gas thrusters have been replaced byncold-gas jets using a lower total pressure and a different gas. The uniqueness of this work involved calibrating thosencold-gas thrusters in order to reproduce an aerodynamic interference very similar to the hot-gas jets case. This hasnbeen achieved by modifying the section ratio of the nozzles in order to control the wave celerity ratio betweennfreestreamand jet flows.Agood agreement has been obtained between numerical simulations of hot-gas and cold-gasnjets flows, aswell as between computations andmeasurements of the pressure coefficient around the body in thewindntunnel. Thus, thismethod has provided a good approximation for the interaction between hot-gas jets and crossflownby using lower-pressure and lower-temperature jets.