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细长圆锥体表面压力分布与当地侧力联系特性

发表时间:2013-08-15  浏览量:1242  下载量:303
全部作者: 孟宣市,高超,罗时钧,刘锋
作者单位: 西北工业大学翼型叶栅空气动力学国家级重点实验室;美国加州大学尔湾分校机械与宇航工程系
摘 要: 对半顶角为10°的圆锥-圆柱组合模型在3.0 m×1.6 m低速低湍流度风洞进行表面压力分布测量。基于圆锥底面直径的雷诺数为0.1×106~0.9×106,迎角0~35°,包含所有的滚转角,以9°为等间隔。对雷诺数为0.3×106的结果进行分析研究,当地侧力由表面压力分布计算得到。结果表明:侧力系数随滚转角的变化曲线在25~30°迎角范围内呈现出连续波曲线特性,在35°迎角下呈现出近似方波曲线特性。并首次在侧力系数随滚转角的变化呈现连续波曲线的迎角范围内,对当地侧力与对应滚转角下截面圆周上的压力分布进行比较分析,结果表明:当地侧力值相等时,对应滚转角下截面圆周上压力分布相同,当地侧力与截面圆周上压力分布一一对应的关系与滚转角无关。这种对应关系对于具有几何相似的细长圆锥体,在侧力出现的迎角范围内,沿模型轴向在任何横截面上均成立。
关 键 词: 流体力学;大迎角;细长圆锥体;表面压力分布;当地侧力
Title: Characteristics of association of local side force with surface pressure distribution over a slender circular cone
Author: MENG Xuanshi, GAO Chao, LUO Shijun, LIU Feng
Organization: National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwestern Polytechnical University; Mechanical and Aerospace Engineering Department, University of California, Irvine
Abstract: A pressure distribution measurement was performed on a circular cone cylinder model in the low-turbulence 3.0 m�.6 m low-speed wind tunnel at angles of attack of 0-35� The semi-apex angle of the cone is 10� The Reynolds number range based on the base diameter of the circular cone is from 0.1 to 0.9 million, and the tests encompassed a complete coverage of roll orientations in 9�intervals. The test data at 0.3 million Reynolds number is analyzed in this paper, and the local side forces over the cone are calculated from the measured pressure over nine stations. The local side force coefficient versus roll angle is a continuous-wave curve at angles of attack from 25�to 30� and nearly a square-wave curve at 35�angle of attack. It is found for the first time that local side force is associated with a characteristic pressure distribution for all asymmetries, which is independent of roll angle and thus generally applicable to cone of the same geometry specifications.
Key words: fluid mechanics; high angle of attack; slender circular cone; surface pressure distribution; local side force
发表期数: 2013年8月第15期
引用格式: 孟宣市,高超,罗时钧,等. 细长圆锥体表面压力分布与当地侧力联系特性[J]. 中国科技论文在线精品论文,2013,6(15):1428-1437.
 
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