一种背负式无附面层隔道进气道的数值模拟研究与实验验证

 采用CFD方法对背负式无隔道进气道/机身一体化流场进行了研究。主要分析了机身上表面附面层的发展情况、进气道进口鼓包排除附面层气流的特性以及进气道内部的流动特征,并将所得到的结果与实验数据进行了对比,比较了两种不同网格的计算准确度。研究发现进口鼓包能够有效地隔除机身上表面的附面层气流,进口段横向压力梯度是导致附面层气流"溢出"进气道的主要驱动力,另外进气道的流量系数对排除附面层气流的效果有着显著影响。

Numerical Simulation Investigation and Experimental Validation of a Top-mounted Diverterless Inlet and Its Validation

To get a good knowledge of the top-mounted diverterless inlet advanced in Ref.1], the integrated flow field of inlet/fuselage is numerically studied. The investigation is mainly focused on the development of the boundary layer of the upper fuselage, the bump's capability in deviating the coming boundary flow and the characteristics of the inner flow. Compared with experimental data, the accuracy of the results obtained by two different grids is also analyzed. Results indicate that the 3-D bump studied here is efficient in deviating the coming boundary flow,especially the lower part.The transverse pressure gradient is the main impetus that deviates the boundary flow.The mass flow ratio has a remarkable influence on the performance of the bump.The ingested low energy flow decreases evidently with the decline of the mass flow ratio.