Effects of Tip Gap Size on the Aerodynamic Performance of a   Cavity-Winglet Tip in a Turbine Cascade

doi:10.1115/1.4036677

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	Effects of Tip Gap Size on the Aerodynamic Performance of a Cavity-Winglet Tip in a Turbine Cascade
	Zhong, Fangpan ; Zhou, Chao
刊名	JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
	2017
关键词	SQUEALER TIP LEAKAGE FLOW HEIGHT
DOI	10.1115/1.4036677
英文摘要	The aerodynamic performance of a cavity-winglet tip is investigated in a high-pressure turbine cascade by experimental and numerical methods. The winglet tip has geometric features of a cavity and a suction side fore-part winglet. A cavity tip is studied as the baseline case. The aerodynamic performances of the two tips are investigated at three tip gaps of 0.8%, 1.7%, and 2.7% chord. At tip gaps of 1.7% and 2.7% chord, the loss near the blade tip is dominated by the tip leakage vortex (TLV) for both tips, and the winglet tip mainly reduces the loss generated by the tip leakage vortex. In the past, it was concerned that at a small tip gap, the winglet tip could introduce extra secondary loss and show little aerodynamic benefits. The winglet tip used in the current study is also found to be able to effectively reduce the loss at the smallest tip gap size of 0.8% chord. This is because at this small tip gap, the tip leakage vortex and the passage vortex (PV) appear simultaneously for the cavity tip. The winglet tip is able to reduce the pitchwise pressure gradient in the blade passage, which tends to suppress the formation of the passage vortex. The effects of the winglet tip on the flow physics and the loss mechanisms are explained in detail.; National Natural Science Foundation of China (NSFC) [51576003]; SCI(E); ARTICLE; 10; 139
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470705]
专题	工学院
推荐引用方式 GB/T 7714	Zhong, Fangpan,Zhou, Chao. Effects of Tip Gap Size on the Aerodynamic Performance of a Cavity-Winglet Tip in a Turbine Cascade[J]. JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME,2017.
APA	Zhong, Fangpan,&Zhou, Chao.(2017).Effects of Tip Gap Size on the Aerodynamic Performance of a Cavity-Winglet Tip in a Turbine Cascade.JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME.
MLA	Zhong, Fangpan,et al."Effects of Tip Gap Size on the Aerodynamic Performance of a Cavity-Winglet Tip in a Turbine Cascade".JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME (2017).