基于小生境遗传算法和RANS方程的平面叶栅气动优化设计舒信伟.pdf

22 1 V ol. 22 N o. 1 2007 1 Journal of AerospacePower Jan . 2007 : 1000- 8055 ( 2007) 01-004 8- 0 6 RA N S 舒信伟, 谷传纲, 杨 波, 王 彤 ( , 2000 30) : R A NS . , Bezier , . Bezier , , , . 8 . 3% . : : V 23 11 3 : A Aerodynamic optimization for cascade blade based on Niche GAs and RANS equation S H U X in- w ei, GU Chuan- gang, Y A N G Bo, WA N G T ong ( School of Mech anical Engineering, Sh angh ai Jiaotong U niversity, Shanghai 200030, China) Abstract: A g lob al opt im ization m et hod f or cascade blade based on N iche GA s ( N iche genet ic algo rithm s) co upled w ith RA N S ( Reynolds- A veraged N avier- St okes) equ at ion h as been present ed . In order to meet t he search t heo ry of GA s and the aerodynamic p er for mances of cascade blade, Bezier curve is adopt ed t o paramet eriz e t he cascade blade prof ile in t his method , and a fit nes s f unct ion pert aining t o optim iz at ion is designed . T he desig n variables ar e t he cont rol po int s. ordinat es of Bezier curve representing t he cascade blade prof ile the object funct ion is t he maximum lif t- drag r at io of the cascade t he co nstr aint condit ion s t ake acco unt of t he leading and t railing edge m et al ang le, and t he st rengt h and aer ody namic p er- f orm er s of cascade blade and t he tr eat ment met hod o f t he con st raint condit ion s is t he f lex i- ble p enalt y funct io n. T he lif t- drag rat io of opt imized cascade is 8. 3 p ercent hig her t h an t hat