Abstract:

To improve the locally searching ability of a genetic algorithm, the mutation operation is replaced by the process of searching for an optimum using the simplex method. The examples show that using the composite genetic algorithm can effectively improve the search efficiency and approach degree to the optimal objective. For constructing the blade mean camber lines, a third order polynomial and a multi arc curve is used. The blade thickness is distributed also by another third order polynomial. The composite genetic algorithm is combined with 2DNS flow field calculation, for an automatic optimization design of the turbomachinery blade. It is attempted that constructing an objective function by the flow turning angle, total pressure loss and blade area; then the composite genetic algorithm is used to design a compressor blade.

Key words: aerodynamic optimization, blade design, compressor, genetic algorithm, simplex method