Study on coupling optimization design of aspirated compressor airfoil based on two different parameterization methods

This paper focuses on creating a new design method optimizing both aspirated compressor airfoil and the aspiration scheme simultaneously. The optimization design method is established on the basis of the improved artificial bee colony algorithm. In the process of optimization design, two different parameterization methods (CLSTD and CST method) are used. A high-load aspirated airfoil is designed to demonstrate the complete process and to verify the effectiveness of the new coupling method. The results show that the total pressure losses of airfoils obtained using CLSTD, CST and Mix method decrease by 23%, 8% and 33% respectively, and the static pressure ratios of the optimized airfoils have a slight improvement. The improved artificial bee colony algorithm indicates a satisfying applicability in aspirated airfoil optimization design, and without affecting the solution precision, the IABC algorithm has a great advantage over standard ABC algorithm in terms of calculation convergence rate. For the high-load aspirated airfoil, the designed leading edge should avoid large spikes in the pressure distribution, and the maximum Mach number in the leading edge needs to be limited. The design that improves the load in the forepart of the aspirated airfoil appropriately, and controls the boundary layer by aspiration is optimum. Although CLSTD method and CST method both perform well, the Mix method which combines CLSTD method with CST method is the optimal in the process of the high-load aspirated airfoil design.