| 孔间距和前倾角对进出口扩张形气膜孔流量系数的影响(英文) |
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| 引用本文： | Li Guangchao,Zhu Huiren,Fan Huiming Department of Aeroengines,Northwestern Polytechnical University,Xi’an ,China.孔间距和前倾角对进出口扩张形气膜孔流量系数的影响(英文)[J].中国航空学报,2008,21(5):385-392. |
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| 作者姓名： | Li Guangchao Zhu Huiren Fan Huiming |
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| 作者单位： | Department of Aeroengines, Northwestern Polytechnical University, Xi ＇an 710072, China |
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| 基金项目： | Acknowledgment This study is sponsored by Rolls-Royce Company of UK. The authors wish to acknowledge the fruitful collaboration with their partners within this project and their permission to publish this article. |
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| 摘 要： | Discharge coefficients of 3-in-1 hole of three inclination angles and three spacing between holes are presented which described the discharge behavior of a row of holes. The inlet and outlet of the 3-in-1 hole both have a 15° lateral expansion. The flow conditions considered are mainstream turbulence intensities and density ratios of secondary flow to mainstream. The momentum flux ratios varied in the range from 1 to 4. The comparison is made of the discharge coefficients of three shaped holes to find an optimal hole with low flow loss. The results show that the discharge coefficients of 3-in- 1 hole are highest in three shaped holes and therefore this article is focused on the measurements of discharge coefficients of 3-in-1 hole for various geometries and aerodynamic parameters. The measured results of 3-in-1 hole indicate that turbulence intensities, density ratios and momentum flux ratios have weak influence on discharge coefficients for inclination angle of 20°. The high turbulence intensity yields the small discharge coefficients for inclination angle of 45° and 90°. The increased both momentum flux ratios and density ratios lead to the increased discharge coefficients for inclination angle of 45° and 90°. The increased inclination angle causes the rapidly increased discharge coefficients. There is a weak dependence of discharge coefficients on hole pitches.
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| 关 键 词： | 航空推进系统 燃气涡轮 薄膜冷却孔 流量系数 |
| 收稿时间： | 30 October 2007 |
Discharge Coefficient of 3-in-1 Hole with Various Inclination Angle and Hole Pitch |
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| Li Guangchao,Zhu Huiren,Fan Huiming.Discharge Coefficient of 3-in-1 Hole with Various Inclination Angle and Hole Pitch[J].Chinese Journal of Aeronautics,2008,21(5):385-392. |
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| Authors: | Li Guangchao Zhu Huiren Fan Huiming |
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| Institution: | Department of Aeroengines, Northwestern Polytechnical University, Xi ＇an 710072, China |
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| Abstract: | Discharge coefficients of 3-in-1 hole of three inclination angles and three spacing between holes are presented which described the discharge behavior of a row of holes. The inlet and outlet of the 3-in-1 hole both have a 15° lateral expansion. The flow conditions considered are mainstream turbulence intensities and density ratios of secondary flow to mainstream. The momentum flux ratios varied in the range from 1 to 4. The comparison is made of the discharge coefficients of three shaped holes to find an optimal hole with low flow loss. The results show that the discharge coefficients of 3-in-1 hole are highest in three shaped holes and therefore this article is focused on the measurements of discharge coefficients of 3-in-1 hole for various geometries and aerodynamic parameters. The measured results of 3-in-1 hole indicate that turbulence intensities, density ratios and momentum flux ratios have weak influence on discharge coefficients for inclination angle of 20°. The high turbulence intensity yields the small discharge coefficients for inclination angle of 45° and 90°. The increased both momentum flux ratios and density ratios lead to the increased discharge coefficients for inclination angle of 45° and 90°. The increased inclination angle causes the rapidly increased discharge coefficients. There is a weak dependence of discharge coefficients on hole pitches. |
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| Keywords: | aerospace propulsion system gas turbine film cooling hole discharge coefficient |
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