边界条件对有限长正方形棱柱气动力的影响

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (5) : 39-46.

论文

边界条件对有限长正方形棱柱气动力的影响

王汉封1，2、杨帆1、邹超1

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Effects of boundary layer conditions on the aerodynamic forces of a finite-length square cylinder

Wang Hanfeng1,2, Yang fan1, Zou chao1

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摘要

通过风洞实验研究了均匀流与湍流边界层中一端固定于壁面、另一端为自由端的有限长正方形棱柱气动力特性。实验模型宽度d = 200mm，高宽比H/d = 5。基于自由流风速U∞与d的雷诺数Red = 0.68×105~5.47 × 105。研究发现，均匀流与湍流边界内有限长正方形柱气动力均不存在明显的雷诺数效应。棱柱局部时均阻力系数、脉动阻力系数和脉动升力系数沿展向存在明显差异。湍流边界层会增大与。且均匀流中脉动风压与气动力的双稳态现象在湍流边界层内基本消失。经POD分析，确定了对称与反对称等两种典型风压分布状态对脉动风压的贡献率。均匀流中，柱体两端附近风压脉动由对称或准对称风压分布所控制；而柱体中部则由反对称风压分布控制。湍流边界层中所有高度风压脉动均由反对称风压分布控制。两种边界条件下，仅反对称形态的POD模态具有明显周期性并对柱体气动力周期性起支配作用。尽管对称风压POD模态在某些位置占支配地位，但其无明显周期性。

Abstract

The effects of boundary layer conditions on the aerodynamic forces of a finite-length square cylinder were experimentally investigated in wind tunnel. The width of the tested model d = 200 mm, and the aspect ration H/d = 5. The tested Reynolds number based on oncoming flow velocity (U∞) and d ranged from 0.68×105~5.47 ×105. It was found that the Reynolds number has no obvious effects on the aerodynamic forces of finite-length square cylinder in both uniform flow and turbulent boundary layer. The local aerodynamic forces coefficients , and are significantly different along cylinder span. Both and are remarkably increased in the turbulence boundary layer relative to those in uniform flow. The bi-stable phenomenon of the fluctuation pressure and aerodynamic forces observed in uniform flow disappears completely in turbulent boundary layer. Contributions from the symmetrical and anti-symmetrical pressure distribution modes to the pressure fluctuation are qualified based POD analysis. In uniform flow, pressure fluctuation near both ends of the cylinder is dominated by symmetrical pressure mode, while that at cylinder mid-span is dominated by anti-symmetrical pressure mode. In turbulent boundary layer, anti-symmetrical pressure distribution is prevalent at all spansiwe positions. For both boundary layer conditions, only the anti-symmetrical POD mode bears remarkable periodicity, which determines the periodicity of the aerodynamic forces. No obvious periodicity is observed for the symmetrical POD mode, though it is dominant at some spanwise positions.

关键词

有限长棱柱 / 气动力 / 边界层条件 / 双稳态 / POD

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王汉封1，2、杨帆1、邹超1. 边界条件对有限长正方形棱柱气动力的影响[J]. 振动与冲击, 2016, 35(5): 39-46

Wang Hanfeng1,2, Yang fan1, Zou chao1. Effects of boundary layer conditions on the aerodynamic forces of a finite-length square cylinder[J]. Journal of Vibration and Shock, 2016, 35(5): 39-46

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