Study of turbulent heat transfer of aviation kerosene flows in a curved pipe at supercritical pressure |
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| Authors: | Xunfeng Li Fengquan Zhong Xuejun Fan Xiulan Huai Jun Cai |
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| Affiliation: | 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100190, China;2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Collaborative Innovation Center of Advanced Aero-Engine, School of Energy and Power Engineering, Beihang University, Beijing 100191, People’s Republic of China;2. AVIC Academy of Aeronautic Propulsion Technology, Beijing 103400, People’s Republic of China;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Science and Technology on Scramjet Laboratory, The 31st Research Institute of CASIC, Beijing 10074, China;1. School of Marine Science and Technology, Northwestern Polytechnical University, P.O. Box 24, Xi''an 710072, China;2. School of Mechanical Engineering, Northwestern Polytechnical Univerisity, P.O. Box 552, Xi''an 710072, China;3. Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden;4. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, Guangdong, China |
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| Abstract: | The flow and heat transfer characteristics of China No. 3 aviation kerosene in a heated curved tube under supercritical pressure are numerically investigated by a finite volume method. A two-layer turbulence model, consisting of the RNG k–ε two-equation model and the Wolfstein one-equation model, is used for the simulation of turbulence. A 10-species kerosene surrogate model and the NIST Supertrapp software are applied to obtain the thermophysical and transport properties of the kerosene at various temperature under a supercritical pressure of 4 MPa. The large variation of thermophysical properties of the kerosene at the supercritical pressure make the flow and heat transfer more complicated, especially under the effects of buoyancy and centrifugal force. The centrifugal force enhances the heat transfer, but also increases the friction factors. The rise of the velocity caused by the variation of the density does not enhance the effects of the centrifugal force when the curvature ratios are less than 0.05. On the contrary, the variation of the density increases the effects of the buoyancy. |
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