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Flow Development through HP&LP Turbines,PartⅠ:Inward Rotating Cavity Flow with superimposed throughflow

Journal of Thermal Science 2017年第4期26卷 297-307页

作者： GAO Jinhai DU Qiang LIU Jun LIU Guang WANG Pei LIU Hongrui DU Meimei Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China Petroleum Production Engineering Research Institute ofHuabei Oilfield Company Renqiu Hebei 062550China

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.

关键词： Turbines Inward rotating cavity flow superimposed throughflow Flow pattern

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