结合吸附技术的对转压气机改型设计

Redesign of Counter-rotating Compressor with Boundary Layer Suction

应用附面层抽吸技术和叶型优化设计方法对某双排对转轴流压气机进行了改型设计数值研究,旨在指导下一步的实验研究。近喘点时,原始出口导流叶片(OGV)尖部叶型存在着严重的气流分离现象。优化设计后,气流在叶型前缘加速平缓,通道内回流区所占比例明显降低,OGV 70%叶展以上的总压损失系数平均降低了38.4%,压气机等熵效率提高了0.3%。在转子2(R2)尖部叶型66%弦长轮缘端壁处开设1mm宽抽吸槽,当近喘点的相对质量抽吸量为1%时,R2尖部的负荷水平改善明显,65%叶展以上等熵效率平均提高了10%。尖部流场的改善对于下游OGV产生了积极的效应,速度三角形的重构使轮缘端壁处的角区分离被限制在了很小的范围内,85%叶展以上的总压损失系数平均降低了25%。通过抽吸,压气机等熵效率又获得了0.5%的收益。

Boundary layer suction and blade optimization are employed in the redesign of a dual-stage counter-rotating compressor with numerical simulation.Further experimental research will be carried out according to the numerical results.At near stall point,there is serious flow separation at the tip region of the original outlet guide vane （OGV）.Airfoil optimization makes smooth acceleration at the leading edge,and decreases the recirculation zone in the blade passage.Up to 70％ spanwise of OGV,total pressure loss coefficient has a 38.4％ drop in average.Isentropic efficiency of the compressor is improved by 0.3％.An axisymmetric suction slot located at 66％ chordwise of Rotor 2 （R2） tip region with 1 mm width is designed at the shroud case.1％ comparative mass flow at near stall point can optimize the loading level of R2 tip region,bringing a 10％improvement in average on R2 isentropic efficiency in higher spanwise from 65％.These result in a positive effect on the flow condition of the OGV：corner separation is limited to a smaller region,total pressure loss coefficient has a 25％ drop in average in the region up to 85％ spanwise,and the isentropic efficiency of the compressor is further improved by 0.5％.