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发展了一种进口型线水平投影可控的三维变截面内收缩进气道设计方法。基于反正切马赫数分布基准流场,在指定进口型线水平投影为椭圆和出口为圆的条件下,结合流线追踪和截面渐变技术设计了光滑过渡的内收缩进气道。在设计点(M_(ai)=5.4)和接力点(M_(ai)=4.0)对其进行数值仿真,计算结果表明,设计点时进气道的主要流动特性与基准流场基本一致,无黏时可以捕获98%的自由来流,喉道性能与基准流场基本相等。相对椭圆进口进气道,截面渐变的椭圆转圆进气道流场结构相似且性能下降较小,有黏条件下设计点和接力点时喉道总压恢复系数分别降低了2.9%和1.2%。此外,该进气道表现出良好的总体性能,接力点的流量系数达0.82。
A design method of three-dimensional variable cross-section deflator inlet with controllable horizontal projection of imported line is developed. Based on the flow field of arc tangent Mach number distribution, a smoothly transitioned internal convergent inlet was designed by combining the streamline tracing and the cross-section gradation with the horizontal projection of the specified inlet line being elliptical and the outlet being round. Numerical simulations were carried out at the design point (M ai = 5.4) and the relay point (M ai = 4.0). The calculation results show that the main flow characteristics of the inlet port at the design point are basically the same as the reference flow field. Viscous can capture 98% of the free flow, the throat performance and the basic flow field is basically equal. Relatively elliptical inlet air intake and cross-section elliptic circular inlet flow field have similar structure and small decrease in performance, and the total pressure recovery coefficient decreases by 2.9% and 1.2% respectively at the design point and the relay point under the viscous condition. . In addition, the inlet showed good overall performance with a flow coefficient of 0.82 at the relay point.