高超声速压缩拐角峰值热流位置预测模型研究

THEORETICAL MODELING FOR THE PREDICTION OF THE LOCATION OF PEAK HEAT FLUX FOR HYPERSONIC COMPRESSION RAMP FLOW

摘要

摘要:旨在通过建立高超声速压缩拐角流动的再附点附近的模型理论来揭示峰值热流的产生机理以及如何可靠预测其位置.首先,分析再附点附近流动特征,提出了基于可压缩斜驻点流动模型来近似该处的局部流动.其次,近似求解了该流动模型,发现边界层厚度存在极小值的特征,从而揭示了再附点后峰值热流的产生机理,并由此得到了再附点和峰值热流点间距离的半解析半数值估算方法.最后,对此结果作了数值验证,并做了讨论.

Abstract:A theoretical model is established to find out why the peak heat flux arises near the reattachment point in hypersonic compression ramp flow and how to predict the location of peak flux.Firstly,the compressible oblique stagnation flow model is set up to describe the nature of flow near reattachment point.Secondly,the approximate solutions of this model reveal that there is a minimum thickness of the boundary layer nearby the reattachment point.Correspondingly,the semi-analytical and semi-numerical method for estimating the location and the magnitude of peak heat flux is presented.Finally,present results are verified by the numerical results,and the extended applications of our theories are discussed.