采用排间界面静压约束伴随方法的多级压气机叶片优化

为解决伴随优化应用在多级压气机中出现的优化工况点漂移问题,在前期薄层N-S方程伴随方法基础上,对目标函数——出口熵增不仅施以质量流量、总压比约束,还添加排间界面静压展向分布作为新的约束条件.以某5级压气机为对象,对其中第1级转、静叶分别在首1.5级和全5级压气机环境下进行了优化.结果表明,施加排间界面静压展向分布约束能够显著解决优化工作点漂移问题,优化后5级压气机的效率提高0.4个百分点. 

Blade shape optimization of multistage compressor using adjoint method with static pressure constraint at interfaces between rows

To solve the problem with the drift of operation condition during the optimization procedure when adjoint method applied in multistage compressor, based on the previous development work of multistage compressor blades optimization design using adjoint method and thin shear-layer N-S equations, the entropy production was selected as the objective function with given mass flow rate and total pressure ratio as imposed constraints, a new constraint was introduced, namely, the spanwise static pressure distribution at the interfaces between rows was imposed. Taking one 5 stage compressor as a test case, the new method was applied at inter-row interfaces behind the rotor and the stator of the first stage in environment of the first 1.5 stage and the whole 5 stage compressor. The results show that the drift problem of the operation condition during optimization procedure is resolved successfully by applying the constraint on spanwise static pressure distribution at the interfaces between rows and the efficiency of 5 stage compressor is got 0.4% improving.