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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。
Applying the technique of surface layer suction and the optimal design method of leaf, a double row numerical simulation of axial flow compressor is designed to guide the next experimental research. Near the point of asthma, there was a severe air separation phenomenon at the tip of the primary outlet guide vane (OGV). After optimized design, the airflow accelerates gently at the leading edge of the blade, and the proportion of recirculation zone in the channel decreases obviously. The total pressure loss coefficient decreases by 38.4% and the isentropic efficiency of the compressor increases by 0.3% on 70% OGV. A 1 mm wide suction groove was provided at the end wall of the 66% chord rim of the rotor 2 (R2) tip, and the load level at the R2 tip improved significantly when the relative mass suction was 1% The isentropic efficiency above 65% on the leaf is increased by an average of 10%. The improvement of the tip flow field has a positive effect on the downstream OGV. The reconstruction of the velocity triangle constrains the corner separation at the rim wall to a very small extent. The total pressure loss coefficient above 85% The average reduction of 25%. Through suction, compressor isentropic efficiency obtained another 0.5% of the proceeds.