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为了研究某半埋入式S弯进气道出口畸变对其后风扇级性能的影响,分别将其原型及优化后模型与风扇级对接进行进气道加风扇级全流道数值研究。结果表明:全周畸变条件下,风扇级效率及增压比相比均匀进气工况明显下降,堵塞流量下降约1.20%,最高效率下降约3.77%;优化后风扇稳定工作范围有较大幅度提升,堵塞流量增加约0.19%,效率最大值增加约0.23%;受动叶旋转影响,进气道出口截面底部显著低能流体区在发展至动叶前缘的过程中逐渐减小,畸变流体与非畸变流体出现相互掺杂趋势,且这一现象在进气道优化前后始终存在。
In order to study the effect of outlet distortion of a semi-embedded S-bend inlet on the performance of the subsequent fan-stage, the numerical simulation of the full-flow inlet-fan-stage system was carried out with the prototype and the optimized model connected to the fan stage respectively. The results show that under the condition of full-week distortion, the fan-stage efficiency and turbocharger ratio are significantly lower than those under uniform air-intake condition, the clogging flow rate decreases about 1.20% and the maximum efficiency decreases about 3.77% The flow rate increased by about 0.19% and the maximum efficiency increased by about 0.23%. Affected by the rotation of the impeller, the significant low-energy fluid zone at the bottom of the inlet cross-section decreased gradually to the leading edge of the moving blade. Non-distorting fluids appear to be interdoping with each other, and this phenomenon always exists before and after the inlet optimization.