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MuItiobjective Optimization Design Method of Transonic Airfoils

Zhong Bowen ;Qiao Zhide(NOrthwestern Polytechnlcal t Unlversity)  
This paper presents an efficient multiobjective optimization design method for the multiple design-point problem of transonic airfoil. The drag coefficients of multiple design-point are considered as objec-tive functions and the hierarchical optimization method is adopted.Inthe optimization process,the objective functions are listed in order of importance. Every Objective function is minimized by the direct search EXTREM method and subjected to the extra constraints to increments of high level objective function.The aerodynamic analysis program is based on the combination of full potential and houndary layer flow which includes the calculation of laminar boundary layer,turbulent bound ary layer,natural or fixed transition prediction and separation predic-tion. By using the multiobjective optimization method in this paper the supercritical airfoils or the conventional low-speed airfoils can be modi-fied to be transonic airfoils Which have lower drag coeffieients at two or more design Mach numbers.The presented method in this paper is very attractive for practical engineering application because of the quick convergence.
【Fund】: 航空科学基金
【CateGory Index】: V224
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