| A numerical study of segmented cooling-stream injection in supersonic film cooling |
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| 作者姓名： | Hang NI Mingjun WANG Peixue JIANG Wei PENG Yinhai ZHU |
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| 作者单位： | 1. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University;2. School of Nuclear Science and Technology, Xi'an Jiaotong University;3. Department of Energy and Power Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University;4. Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology, Tsinghua University |
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| 基金项目： | co-supported by the National Key R&D Program of China (No. 2018YFB1900500)；;the National S&T Major Project of China (No. J2019-Ⅲ-0019-0063)； |
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| 摘 要： | The present study proposes a segmented cooling-stream injection structure based on a certain coolant mass flow rate, and numerically investigates the effect of segmented cooling-stream injection on supersonic film cooling. The results indicate that without shock-wave impingement and with helium as the coolant, segmented cooling-stream injection can reduce the mixing between the mainstream and the cooling stream to produce better cooling performance than single injection, especially at larger coo...
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| 收稿时间： | 4 February 2021 |
A numerical study of segmented cooling-stream injection in supersonic film cooling |
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| Hang NI,Mingjun WANG,Peixue JIANG,Wei PENG,Yinhai ZHU.A numerical study of segmented cooling-stream injection in supersonic film cooling[J].Chinese Journal of Aeronautics,2022,35(6):156-171. |
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| Institution: | 1. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China;2. School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi''an 710049, China;3. Department of Energy and Power Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;4. Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology, Tsinghua University, Beijing 100084, China |
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| Abstract: | The present study proposes a segmented cooling-stream injection structure based on a certain coolant mass flow rate, and numerically investigates the effect of segmented cooling-stream injection on supersonic film cooling. The results indicate that without shock-wave impingement and with helium as the coolant, segmented cooling-stream injection can reduce the mixing between the mainstream and the cooling stream to produce better cooling performance than single injection, especially at larger coolant Mach numbers. However, with nitrogen as the coolant, the cooling effect of the segmented-injection system is very close to that of the single-injection system. Mixing at the impinging region is enhanced significantly when there is an incident shock wave. When the shock wave impinges between the two coolant inlets, segmented cooling-stream injection improves film cooling effectiveness in the midstream and downstream regions more than single injection because only part of the cooling stream undergoes the enhanced mixing effect of the shock wave. The advantage of segmented injection is reduced when the impinging region is behind the second coolant inlet. The further downstream the impinging region, the smaller the associated advantage. |
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| Keywords: | Film cooling Mach number Segmented injection Shock wave Supersonic flow |
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