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Numerical Optimization on Aerodynamic/Stealth Characteristics of Airfoil Based on CFD/CEM Coupling Method 被引量:3
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作者 Jiang Xiangwen Zhao Qijun +1 位作者 Zhao Guoqing Meng Chen 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2016年第3期274-284,共11页
Based on computational fluid dynamics (CFD)/computational eleetromagnetics method (CEM) coupling method and surrogate model optimization techniques, an integration design method about aerodynamic/stealth character... Based on computational fluid dynamics (CFD)/computational eleetromagnetics method (CEM) coupling method and surrogate model optimization techniques, an integration design method about aerodynamic/stealth characteristics of airfoil is established. The O-type body-fitted and orthogonal grid around airfoil is first generated by using the Poisson equations, in which the points per wave and the normal range satisfy the aerodynamic and electromagnetic calculation accuracy requirement. Then the aerodynamic performance of airfoil is calculated by sol- ving the Navier-Stokes (N-S) equations with Baldwin-Lomax (B-L) turbulence model. The stealth characteristics of airfoil are simulated by using finite volume time domain (FVTD) method based on the Maxwell's equations, Steger-Warming flux splitting and the third-order MUSCL scheme. In addition, based upon the surrogate model optimization technique with full factorial design (FFD) and radial basis function (RBF), an integration design about aerodynamic/stealth characteristics of rotor airfoil is conducted by employing the CFD/CEM coupling meth- od. The aerodynamic/stealth characteristics of NACA series airfoils with different maximum thickness and camber combinations are discussed. Finally, by choosing suitable lift-to-drag ratio and radar cross section (RCS) ampli- tudes of rotor airfoil in four important scattering regions as the objective function and constraint, the compromised airfoil with high lift-to-drag ratio and low scattering characteristics is designed via systemic and comprehensive ana- lyses. 展开更多
关键词 rotor airfoil aerodynamic characteristics stealth characteristics CFD/CEM coupling surrogate modle
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Integrated optimization analyses of aerodynamic/stealth characteristics of helicopter rotor based on surrogate model 被引量:14
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作者 Jiang Xiangwen Zhao Qijun +1 位作者 Zhao Guoqing Li Peng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第3期737-748,共12页
Abstract Based on computational fluid dynamics (CFD) method, electromagnetic high-frequency method and surrogate model optimization techniques, an integration design method about aerody- namic/stealth has been estab... Abstract Based on computational fluid dynamics (CFD) method, electromagnetic high-frequency method and surrogate model optimization techniques, an integration design method about aerody- namic/stealth has been established for helicopter rotor. The developed integration design method is composed of three modules: integrated grids generation (the moving-embedded grids for CFD sol- ver and the blade grids for radar cross section (RCS) solver are generated by solving Poisson equa- tions and folding approach), aerodynamic/stealth solver (the aerodynamic characteristics are simulated by CFD method based upon NavieStokes equations and Spalart-Allmaras (S-A) tur- bulence model), and the stealth characteristics are calculated by using a panel edge method combining the method of physical optics (PO), equivalent currents (MEC) and quasi-stationary (MQS), and integrated optimization analysis (based upon the surrogate model optimization technique with full factorial design (FFD) and radial basis function (RBF), an integrated optimization analyses on aerodynamic/stealth characteristics of rotor are conducted. Firstly, the scattering characteristics of the rotor with different blade-tip swept and twist angles have been carried out, then timfrequency domain grayscale with strong scattering regions of rotor have been given. Meanwhile, the effects of swept-tip and twist angles on the aerodynamic characteristic of rotor have been performed. Furthermore, by choosing suitable object function and constraint condition, the compromised design about swept and twist combinations of rotor with high aerodynamic performances and low scattering characteristics has been given at last. 展开更多
关键词 Aerodynamic characteristicsEquivalent currents Physical optics Quasi stationary ROTOR Radar cross section stealth characteristics Surrogate model
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