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为了明确混合排气系统内涵进气预旋角对环形混合器混合排气系统气动热力性能的影响,采用基于Navier-Stokes方程组的三维流场数值仿真方法对某环形混合器混合排气系统在不同进气预旋角工况下的流场进行了分析,并将结果同轴向进气的情况进行了对比.结果表明:内、外涵之间剪切层的厚度以及剪切层的扭曲程度随进气预旋角的增加而增大.在环形混合器混合排气系统出口处,随着进气预旋角的增加,热混合效率小幅升高,其中30°进气预旋角模型热混合效率为轴向进气模型的1.36倍;总压恢复系数和环形混合器混合排气系统推力逐渐降低,较轴向进气模型,30°进气预旋角模型总压恢复系数降低了0.003 4,而相对推力下降了0.081.
In order to clarify the influence of the pre-rotation angle of the intake of the hybrid exhaust system on the aerodynamic performance of the hybrid exhaust system, a three-dimensional flow field numerical simulation method based on the Navier-Stokes equations was used to simulate the hybrid exhaust system The results show that the thickness of the shear layer between the inner and outer layers and the distortion of the shear layer The degree increases with the increase of inlet pre-rotation angle.With the increase of inlet pre-rotation angle, the efficiency of heat-mixing increases slightly at the outlet of annular mixer mixing and exhaust system, and the pre-rotation angle of 30 ° The heat mixing efficiency is 1.36 times of the axial air intake model. The total pressure recovery coefficient and the thrust of the hybrid mixer exhaust system decrease gradually. Compared with the axial air intake model and the 30 ° pre-rotation air intake model, the total pressure recovery coefficient decreases 0.003 4, while the relative thrust decreased by 0.081.