自由射流试验中进气道上斜板结构影响仿真评估

Simulation evaluation of influence of the inlet upper inclined plate in free jet test

为准确掌握组合动力冲压发动机自由射流试验方法,分析有限设备能力条件下超声速进气道波系试验结果的有效性,采用数值仿真方法对截去和未截去超声速进气道上斜板的冲压发动机自由射流试验布局进行了对比分析。结果表明,超声速进气道上斜板附面层的发展将影响进气道内的气流角,且气流角的改变对冲压发动机燃烧室进口截面气动参数影响明显;截去超声速进气道上斜板的自由射流试验,可采用调整气流角的方法考虑上斜板附面层造成的影响,进而减小模拟偏差。

To accurately grasp free jet test method for the ramjet of combination cycle engine,and analyze validity of the supersonic inlet test results under constrained test condition,comparison between ramjet engine free jet test layout for supersonic inlet with and without inclined plate was carried out using numerical simulation method.Results show that the boundary layer development of supersonic inlet inclined plate has influence on intake flow angle,and flow angle variance has obvious impact on the aerodynamic parameters of ramjet combustor inlet section.For the free jet test of supersonic inlet without inclined plate,method of adjusting flow angle which considers the influence of boundary layer on inclined plate can be used to reduce simulation deviation