Experimental and numerical investigation of periodic downstream potential flow on the behavior of boundary layer of high-lift low-pressure turbine blade

Sun Shuang; Wu Xingshuang; Huang ZhenHu XizhuoZhang PengKong Qingguo

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Experimental and numerical investigation of periodic downstream potential flow on the behavior of boundary layer of high-lift low-pressure turbine blade

机译：Experimental and numerical investigation of periodic downstream potential flow on the behavior of boundary layer of high-lift low-pressure turbine blade

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A high-lift and compact design can reduce the weight of low-pressure Turbine (LPT), but increase the complexity of the boundary layer flow of LPT, which affects the LPT blade profile loss. This study experimentally and numerically investigates the boundary layer of a high lift low-pressure turbine blade with a periodic downstream pressure field. The investigations are conducted at inflow Reynolds numbers of 87000. Experiments are performed on a low-speed cascade test rig, and CFD simulations are used to create a time-averaged and instantaneous flow field. With a downstream potential flow field, the velocity field and pressure field of the boundary layer are found to fluctuate periodically. Due to the viscous free shear layer, the velocity at the edge of the shear layer and the wall shear stress also exhibit a phase difference. By decomposing and reconstructing the instantaneous flow field, the downstream potential flow is shown to destabilize the separation bubble and induce the vortex-shedding earlier, causing transition to occur earlier, increasing profile losses. The disturbance energy distribution of the boundary layer is more broadened and migrates into smaller scale vortices. However, the downstream potential flow does not change the dominant role of K-H instability affecting transition. (c) 2022 Elsevier Masson SAS. All rights reserved.

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《Aerospace science and technology》 |2022年第4期|107453.1-107453.13|共13页
作者
Sun Shuang; Wu Xingshuang; Huang ZhenHu XizhuoZhang PengKong Qingguo;
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作者单位

Civil Aviat Univ China, Dept Aviat Engn, 2898 Jinbei Rd, Tianjin 300300, Peoples R China|CARDC, State Key Lab Aerodynam, 6,South Sect,Second Ring Rd, Mianyang 621000, Sichuan, Peoples R China;

Civil Aviat Univ China, Dept Aviat Engn, 2898 Jinbei Rd, Tianjin 300300, Peoples R China;

Civil Aviat Univ China, Sino European Inst Aviat Engn, 2898 Jinbei Rd, Tianjin 300300, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
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正文语种英语
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Experimental and numerical investigation of periodic downstream potential flow on the behavior of boundary layer of high-lift low-pressure turbine blade

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