Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades

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	Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades
	Tan, C. Q.1; Zhang, H. L.1; Chen, H. S.1; Yamamoto, A.2
刊名	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
	2011
卷号	225 期号:A1 页码:131-140
关键词	ultra-highly loaded turbine cascade bowed blade loss
英文摘要	For the first time, a systematic experimental investigation on flow fields and losses of an ultra-highly loaded turbine cascade with bowed blades has been conducted. Flow patterns, secondary flow vortices and vectors, losses, and yaw angles at the downstream outlet have been analysed based on the measurements. The results show that the flow fields downstream of the cascade are characterized by a complicated vortex structure including passage vortices (PVs), trailing edge vortices (TVs), and corner vortices (CVs). The high-loss cores at the cascade outlet roughly correspond to the high-vorticity regions. A-20 degrees bow angle gives the optimal aerodynamic performance under the conditions of this work, but the overall improvement is not significant. Appropriate negative blade bowing weakens the PVs and TVs and prevents the meeting and mixing of the PVs at the midspan, hence improving the flow fields and reducing the overall losses. However, negative blade bowing also increases the flow separation in corner regions, and enhances the CVs and the accumulation of low-energy air flow. This partially counteracts the beneficial effects, making the overall improvement not significant. The pitch-averaged yaw angle at the outlet of the cascade varies dramatically over the whole span. Negative blade bowing can improve the uniformity of the yaw angle distribution at the outlet. On the contrary, positive blade bowing degrades the aerodynamic performance of the cascade.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Mechanical
研究领域[WOS]	Engineering
关键词[WOS]	AERODYNAMIC PERFORMANCE ; PROFILED ENDWALLS ; VORTEX STRUCTURES ; SECONDARY FLOWS ; TOPOLOGY ; DESIGN
收录类别	SCI
语种	英语
WOS记录号	WOS:000287689500014
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/106545]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 2.Japan Aerosp Explorat Agcy, Aircraft Prop Res Ctr, Tokyo, Japan
推荐引用方式 GB/T 7714	Tan, C. Q.,Zhang, H. L.,Chen, H. S.,et al. Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades[J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,2011,225(A1):131-140.
APA	Tan, C. Q.,Zhang, H. L.,Chen, H. S.,&Yamamoto, A..(2011).Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,225(A1),131-140.
MLA	Tan, C. Q.,et al."Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 225.A1(2011):131-140.