Lateral jet interaction with a supersonic crossflow

摘要

A lateral jet in a supersonic crossflow creates a highly complex three-dimensional flowfield which is not easily predicted. The aim of this research was to assess the use of aRANS based CFD method to simulate a lateral jet in supersonic crossflow interaction bycomparing the performance of available RANS turbulence models.Four turbulence models were trialled in increasingly complex configurations; a flatplate, a body of revolution and a body of revolution at incidence. The results of thisnumerical campaign were compared to existing experimental and numerical data.Overall the Spalart-Allmaras turbulence model provided the best fit to experimentaldata. The performance of the lateral jet as a reaction control system was assed bycalculating the force and moment amplification factors. The predicted flowfieldsurrounding the interaction was analysed in detail and was shown to predict theaccepted shock and vortical structures. The lateral jet interaction flowfield over a bodyof revolution was shown to be qualitatively the same as that over a flat plate.An experimental facility was designed and manufactured allowing the study of thelateral jet interaction in Cranfield University’s 2 ½” x 2 ½” supersonic windtunnel. Theinteraction was studied with a freestream Mach number of 1.8, 2.4 & 3.1 and over arange of pressure ratios (50≤PR≤200). Levels of unsteadiness in the interaction weremeasured using high bandwidth pressure transducers. The level of unsteadiness wasquantified by calculating the OASPL of the pressure signal. OASPL was found toincrease with increasing levels of PR or MPR and to decrease with increases of Machnumber. The levels of unsteadiness found were low with the highest levels founddownstream of the jet.