Numerical investigation of radial inflow in the impeller rear cavity with and without baffle
文献类型：期刊论文
| 作者 | Liu Guang1,2; Du Qiang1; Liu Jun1,2; Wang Pei1; Zhu JunQiang1 |
| 刊名 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
 |
| 出版日期 | 2016-03-01 |
| 卷号 | 59期号:3页码:456-467 |
| 关键词 | impeller rear cavity de-swirling device baffle Batchelor's Model Vortex Model |
| 英文摘要 | 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标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Multidisciplinary ; Materials Science, Multidisciplinary |
| 研究领域[WOS] | Engineering ; Materials Science |
| 关键词[WOS] | FLOW |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000371642800013 |
| 源URL | [http://ir.etp.ac.cn/handle/311046/112440]  |
| 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.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Guang,Du Qiang,Liu Jun,et al. Numerical investigation of radial inflow in the impeller rear cavity with and without baffle[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2016,59(3):456-467. |
| APA | Liu Guang,Du Qiang,Liu Jun,Wang Pei,&Zhu JunQiang.(2016).Numerical investigation of radial inflow in the impeller rear cavity with and without baffle.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,59(3),456-467. |
| MLA | Liu Guang,et al."Numerical investigation of radial inflow in the impeller rear cavity with and without baffle".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 59.3(2016):456-467. |
入库方式： OAI收割
来源：工程热物理研究所
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