标题：
Numerical Study on Laminar Separation Control Using Dynamic Hump in High-Loaded Low Pressure Turbine Cascade at Low-Reynolds Number
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所属单位：
能源与动力学院
发表刊物：
Tuijin Jishu
摘要：
To alleviate the laminar separation on high loaded low pressure turbine cascade of PAKB that operating at low Reynolds number of 2.5×104, a dynamic hump was arranged on the suction surface of the blade for active flow control. The hump, shaped as half sinusoidal, vibrated normal to the blade surface in sine wave, with maximum amplitude of 1 mm and frequency of 200Hz. The effects of hump location and width on cascade performance were studied through unsteady numerical simulation. The cascade with dynamic hump located upstream and close to the peak velocity point has the lowest total pressure loss coefficient, which is reduced by 28.8% compared with uncontrolled cascade. When the hump is placed downstream of separation point or far upstream of peak velocity point, the cascade performance grows worsen. It is also revealed that the effects of hump width on cascade performance are small when putting the hump at the optimum location. The flow control mechanism of laminar separation comes from the continuous small laminar vortices that are detached from the dynamic hump and attached to the suction surface. Continuous vortices confine the low-energy fluid near the suction surface by energy exchange between the free flow and near-wall flow, which suppress the large-scale flow separation. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.
ISSN号：
1001-4055
是否译文：
否
发表时间：
2019-02-01
合写作者：
Xu, Kun,Zhong, Dong-Dong,葛宁
通讯作者：
杨荣菲
发表时间：
2019-02-01
学位：工学博士学位
职称：讲师
所在单位：能源与动力学院