摘要
应用同位网格下的压力校正算法和滑移网格技术 ,在贴体曲线坐标系下 ,对离心式压气机模型级内部由于叶轮与叶片扩压器相互作用引起的三维非定常湍流流场进行了数值模拟。计算结果表明 ,在设计工况下 ,由于叶轮与叶片扩压器的相互作用引起的非定常干涉流动 ,对整级内部流动有非定常影响。速度场的非定常特性主要表现在叶轮与叶片扩压器间的径向间隙范围内和扩压器的入口处 ,在叶轮和扩压器叶道内部衰减很快。而压力脉动同时向流道的上下游传播 ,在叶轮和扩压器内部流动仍具有显著的压力非定常脉动。
Using the technique of collocated grid scheme and sliding mesh,coupled with standard k ε turbulence model,the computation of the unsteady flow in a centrifugal compressor stage model due to impeller/diffuser interaction is performed by a pressure based algorithm under the general curvilinear coordinate system.The computation results show that,the impeller/diffuser interaction has unsteady effect on the whole flow field of the stage.The unsteady component of the velocity is marked in the gap between the impeller and diffuser,while vanishes quickly in the blade channels of the impeller and diffuser.However,the pressure unsteadiness due to the impeller/diffuser interaction remains obviously throughout the blade channels.The results simulate the impingement of the flow from the impeller on the diffuser blades adjacent downstream,and,the transportation of the vortex series at the diffuser inlet and its interaction with the diffuser blades,which may result in noise.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2002年第1期58-64,共7页
Journal of Aerospace Power
基金
国家自然科学基金资助项目 ( 5 98760 2 8)
