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-averaged Navier-Stokes computations and pressure measurements in a wind tunnel, using pressure taps and pressure-sensitive paint, have been performed. For experimental investigations, real hot-gas thrusters have been replaced by cold-gas jets using a lower total pressure and a different gas. The uniqueness of this work involved calibrating those cold-gas thrusters in order to reproduce an aerodynamic interference very similar to the hot-gas jets case. This has been achieved by modifying the section ratio of the nozzles in order to control the wave celerity ratio between freestream and jet flows. A good agreement has been obtained between numerical simulations of hot-gas and cold-gas jets flows, as well as between computations and measurements of the pressure coefficient around the body in the wind tunnel. Thus, this method has provided a good approximation for the interaction between hot-gas jets and crossflow by using lower-pressure and lower-temperature jets.