Investigation of mixed convection of supercritical pressure RP-3 in vertical round tube
JIA Zhouxia, XU Guoqiang, WEN Jie, LONG Xiaodong, WANG Yue
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Abstract：The mixed convection research of supercritical pressure hydrocarbon aviation fuel RP-3 in vertical tube was conducted and the effects of buoyancy and thermophysical properties on convection was investigated. The wall heat fluxes (200-500 kW/m2), inlet pressure (3-5 MPa) and inlet Reynolds number (5 000-10 500) were maintained in the experiments. The study shows that heat transfer impairment occurrs in inlet region for all upward flow conditions due to buoyancy effects, which is not observed in the downward flow. The heat transfer coefficient increases as the fluid bulk temperature increased as a result of comprehensive effects of thermophysical properties. At lower inlet Reynolds number (5 700), the radial velocity profile changes in downward flow conditions leading to heat transfer enhancement due to buoyancy effects. The buoyancy effects are also significant for higher inlet Reynolds number (10 500). The criterion equation (Bo* < 5.6×10-7) failed to evaluate buoyancy effects on hydrocarbon fuel heat transfer.
贾洲侠, 徐国强, 闻洁, 龙晓东, 王越. 超临界压力RP-3在竖直细圆管内混合对流研究[J]. 北京航空航天大学学报, 2016, 42(1): 152-157.
JIA Zhouxia, XU Guoqiang, WEN Jie, LONG Xiaodong, WANG Yue. Investigation of mixed convection of supercritical pressure RP-3 in vertical round tube. JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2016, 42(1): 152-157.
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2016, Vol. 42 
