地面效应对反推状态下发动机进口流场影响数值研究

Numerical Study of Influence of Ground Effect on Flow Field of Engine Inlet in Reverse State

为分析与评估地面效应对反推状态下大涵道比涡扇发动机进口流场影响,对某型大涵道比涡扇发动机台架试验的5个状态点开展反推状态下的数值模拟研究,通过与试验数据对比,验证数值方法的准确性。在此基础上,进行反推状态下单台发动机三维流场细节的研究,通过对比固定地面和移动地面以及不同离地高度时的计算结果,获取反推扰流流场中大涵道比涡扇发动机进口AIP截面周向稳态总压畸变指数,总结地面效应对反推状态下大涵道比涡扇发动机进口流场影响特性。

In order to analyze and evaluate the influence of ground effect on the inlet flow field of high bypass ratio turbofan engine in the reverse thrust state,a numerical simulation study of the reverser flow field was carried out for five state points of high bypass ratio turbofan engine bench test.Comparision with the experimental thrust values was conducted to verify the accuracy of the numerical method and to determine the mesh quantities and turbulence models.Based on this,the research on the reverser flow field under different relative incoming was undertaken.By means of comparison with the calculation results of the fixed and the moving grounds and different ground cleance heights,the AIP cross section of the steady-state total pressure distortion index of the turbofan engine inlet in the reverse-turbulent flow field was abtained and the effect of the ground effect on the turbofan engine inlet flow field in the reverse-thrust state was summarized.