Flow Development through HP&LP Turbines,PartⅠ:Inward Rotating Cavity Flow with Superimposed Throughflow

作     者：GAO Jinhai DU Qiang LIU Jun LIU Guang WANG Pei LIU Hongrui DU Meimei 

作者机构：Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of SciencesBeijing 100049China Petroleum Production Engineering Research Institute ofHuabei Oilfield CompanyRenqiu Hebei 062550China 

基　　金：the National Natural Science Foundation of China for sponsoring the research described in the current paper(No.51406204) 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2017年第26卷第4期

页      码：297-307页

摘      要：With the aid of numerical method, both flow field and its accompanied loss mechanism within the rotating cavity are investigated in detail in the 1^(st) part of the two parts paper. For ease of comparison, rotating cavity is further classified as the rotor-stator cavity case and the rotor-rotor cavity case. Results indicate that flow within both kinds of the cavity act as the inviscid flow except that the flow near walls, neighboring the lower G region and in the vicinity of the rotating orifices. In the regions except such inviscid-flow-dominate domains, the theoretical core rotation factor can be safely used to predict the swirl ratio within the cavity. When detailed flow pattern is considered, Ekman-type flow exists near periphery of the surface s boundary layer where viscous effect is non-negligible. However, due to the complex profile of the simulated cavity case, vortices structure is varied within the cavity. By comparison, swirl ratio can be used to predict the magnitude of loss. Due to the relatively evident rotating effects of the rotor-rotor cavity, swirl ratio even increases to 1.4 in the current model, which means that flow is moving faster than the surrounding disc. Further investigation finds that this kind of highly rotating flow is accompanied with serious undesirable pressure loss. Parenthetically, unlike its counterpart, swirl ratio above 1.0 doesn t happen when fluid passes through the rotor-stator cavity. So it is suggested that rotor-rotor flow cavity with the superimposed inward throughflow should be avoided in the engine design or certain measurements should be provided when such structure design is unavoidable. Simulation done in the current paper is meaningful since these dimensional parameters are typical in the design of state-of-art. Relatively lower range of Re_φ and C_w is not considered in the current two parts paper.

主 题 词：内旋转 低压涡轮 叠加 无粘流动 压力损失 发动机设计 涡流比 损耗机理 

学科分类：080703[080703] 08[工学] 0807[工学-电子信息类] 0805[工学-能源动力学] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1007/s11630.017.0942.7

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