不同圆角率的方形断面气动特性的雷诺数效应

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (4) : 150-156.

论文

杨群1,2，刘庆宽2,3，韩瑞1，刘小兵2,3

作者信息 +

Reynolds number effect of aerodynamic characteristics of square prism with different rounded corner ratios

YANG Qun1,2，LIU Qingkuan2,3，HAN Rui1，LIU Xiaobing2,3

Author information +

文章历史 +

摘要

通过刚性模型测压风洞试验，在均匀流场中测试了标准方形断面及圆角率分别为0.1，0.2，0.3和0.4时的方形断面在雷诺数Re=0.8×105~3.8×105内的气动特性。结果表明：在试验雷诺数范围内，标准方形断面的平均阻力系数、平均升力系数及斯特罗哈数基本不受雷诺数的影响，但脉动升力系数受雷诺数的影响比较明显；圆角率为0.1的方形断面的平均阻力系数、平均升力系数及斯特罗哈数随雷诺数有一定变化，脉动升力系数随雷诺数的变化明显；圆角率为0.2，0.3和0.4的方形断面的平均阻力系数、平均升力系数及斯特罗哈数对雷诺数非常敏感，其在临界雷诺数附近均产生了明显的跳跃现象，但脉动升力系数受雷诺数的影响相对不大。

Abstract

Aerodynamic characteristics of standard square prisms and square prisms with rounded corner ratio 0.1, 0.2, 0.3 and 0.4 were tested through rigid model pressure-measured wind tunnel tests in a uniform wind filed.The Reynolds number Re ranges from 0.8×105 to 3.8×105.The results show that for standard square prisms, the Reynolds number effect is very weak for mean drag coefficient, mean lift coefficient, Strouhal number, and obvious for fluctuating value of lift coefficient.For square prisms with rounded corner ratio 0.1, the Reynolds number effect is slight for mean drag coefficient, mean lift coefficient, Strouhal number, and obvious for fluctuating value of lift coefficient.For square prisms with rounded corner ratio 0.2, 0.3 and 0.4, the Reynolds number effect is significant for mean drag coefficient, mean lift coefficient, Strouhal number and weak for fluctuating value of lift coefficient.Around critical Reynolds number, mean drag coefficient, mean lift coefficient, and Strouhal number change dramatically.

导出引用

杨群1,2，刘庆宽2,3，韩瑞1，刘小兵2,3. 不同圆角率的方形断面气动特性的雷诺数效应[J]. 振动与冲击, 2020, 39(4): 150-156

YANG Qun1,2，LIU Qingkuan2,3，HAN Rui1，LIU Xiaobing2,3. Reynolds number effect of aerodynamic characteristics of square prism with different rounded corner ratios[J]. Journal of Vibration and Shock, 2020, 39(4): 150-156

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