作　　者： ; ; ; ;

机构地区： 西北工业大学动力与能源学院翼型叶栅空气动力学国防科技重点实验室

出　　处： 《西北工业大学学报》 2004年第5期545-549,共5页

摘　　要： 结合定常 CFD技术和超音速非定常气动力工程计算方法——活塞理论 ,发展了一种基于超音速、高超音速定常流场求解非定常气动力的当地流活塞理论。适用于超音速、高超音速飞机颤振中的小振幅非定常气动力计算。通过与非定常 Euler方程求解结果的比较 ,发现在马赫数不太高或大迎角的超音速流动中 ,其精度比原始活塞理论高得多 ,也能够计算超音速、高超音速下大钝头和考虑机身干扰的复杂外形非定常气动力 ,扩大了活塞理论的应用范围。与非定常 Euler方程或N- S方程的数值求解相比 。 This paper aims at providing a good preparation for solving supersonic and hypersonic flutter problems. Flutter calculations require unsteady aerodynamic loads; but, with available methods, either the computation time required is too much or the calculated unsteady loads are not sufficiently accurate. We now propose a method that can calculate unsteady loads accurately and efficiently. Unsteady CFD(computational fluid dynamics)technology can compute accurately unsteady loads but require too much time. Piston theory can calculate unsteady loads efficiently but the accuracy is insufficient. We like the feature of efficiency of piston theory and retain this feature in the local piston theory which we propose and describe in detail in this paper. The local piston theory that we propose is combined with steady flow field to calculate unsteady loads efficiently. This paper describes in detail how to combine local piston theory with steady flow field. We did a rather large amount of calculation for a numerical example and the results show preliminarily that, after a steady flow field is known, the time needed to calculate accurately a 3D dynamic response is no more than one minute.

关 键 词： 当地流活塞理论 超音速 高超音速 非定常气动力 颤振

领　　域： [航空宇航科学与技术] [航空宇航科学技术]