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Title: Numerical investigation of radial inflow in the impeller rear cavity with and without baffle
Author: Liu Guang1, 2; Du Qiang1; Liu Jun1, 2; Wang Pei1; Zhu JunQiang1
Source: SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Issued Date: 2016-03-01
Volume: 59, Issue:3, Pages:456-467
Keyword: impeller rear cavity ; de-swirling device ; baffle ; Batchelor's Model ; Vortex Model
DOI: 10.1007/s11431-015-5972-3
DOC Type: Article
English Abstract: In typical small engines, the cooling air for high pressure turbine (HPT) in a gas turbine engine is commonly bled off from the main flow at the tip of the centrifugal impeller. The pressurized air flow is drawn radially inwards through the impeller rear cavity. The centripetal air flow creates a strong vortex because of high inlet tangential velocity, which results in significant pressure losses. This not only restricts the mass flow rate, but also reduces the cooling air pressure for down-stream hot components. The present study is devoted to the numerical modeling of flow in an impeller rear cavity. The simulations are carried out with axisymmetric and 3-D sector models for various inlet swirl ratio beta (0) (0-0.6), turbulent flow parameter lambda (T) (0.028-0.280) with and without baffle. The baffle is a thin plate attached to the stationary wall of the cavity, and is proved to be useful in reducing the pressure loss of centripetal flow in the impeller rear cavity in the current paper. Further flow details in impeller rear cavity with and without baffle are displayed using CFD techniques. The CFD results show that for any specified geometry, the outlet pressure coefficient of impeller rear cavity with or without baffle depends only on the inlet swirl ratio and turbulent flow parameter. Meanwhile, the outlet pressure coefficient of the cavity with baffle is indeed smaller than that of cavity without baffle, especially for the cases with high inlet swirl ratio. The suppression of the effect of centrifugal pumping and the mixing beween the main air which is downstream of the baffle and the recirculating flow of the vortex in the stationary cavity, which are caused by the use of baffle, are the underlying reasons that lead to the reduction of outlet pressure loss.
WOS Headings: Science & Technology ; Technology
WOS Subject: Engineering, Multidisciplinary ; Materials Science, Multidisciplinary
WOS Subject Extended: Engineering ; Materials Science
WOS Keyword Plus: FLOW
Indexed Type: SCI
Funder: National Natural Science Foundation of China(51306177)
Language: 英语
WOS ID: WOS:000371642800013
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112440
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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