论文部分内容阅读
为了改善内转式进气道的性能,采用数值仿真的方法研究了内转式进气道的流动特征及流场控制技术。研究表明:在近壁面唇罩激波诱发了二次流,进而发展形成流向涡,造成低能流堆积,流场分布不均,消弱了进气道的抗反压能力。采用型面流场控制技术,重构进气道肩部压力与边界层分布,能够有效抑制流向涡的强度,减小流动损失,改善隔离段出口流场均匀度,提高其抗反压能力。与原方案相比,在设计状态流场控制方案隔离段出口总压恢复系数提高20%;最大抗反压能力提高28.4%;总阻力增大9.0%,进气道自起动马赫数由原方案4.2下降到该方案3.8。
In order to improve the performance of the internal transhipment air intake, numerical simulation is used to study the flow characteristics and flow field control technology of the internal transhipment air intake. The research shows that the lip shock near the wall induces the secondary flow, and then develops the flow vortex, resulting in the accumulation of low energy flow and the uneven distribution of the flow field, which weakens the anti-backpressure capability of the inlet port. The use of profile flow control technology to reconstruct the shoulder pressure and the boundary layer distribution in the inlet can effectively reduce the strength of the flow vortices, reduce the flow loss, improve the flow field uniformity at the outlet of the isolation section and improve its anti-backpressure capability. Compared with the original scheme, the total pressure recovery coefficient at the exit of the isolated section of the flow field control scheme in the design state increased by 20%, the maximum anti-pressure capability increased by 28.4%, the total resistance increased by 9.0%, and the inlet self-starting Mach number increased from original plan 4.2 dropped to the program 3.8.