桥梁断面表面压力分布及Strouhal数的雷诺数效应

刘健新;崔欣;李加武

振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 146-149.

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PDF(1525 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 146-149.
论文

桥梁断面表面压力分布及Strouhal数的雷诺数效应

  • 刘健新;崔欣;李加武
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Reynolds Number Effect on Surface Pressure Distribution and Strouhal Number of Typical Bridge Deck Section

  • Liu Jianxin;Cui Xin;Li Jiawu
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摘要



为了研究桥梁断面Strouhal数的雷诺数效应,通过调节试验风速来改变雷诺数,并在模型表面布置测压点,进行风洞试验。测量了不同雷诺数下各测点的风压时程,分析了压力梯度及压力系数功率谱及涡脱频率的随雷诺数变化规律,研究了Strouhal数的雷诺数效应。研究发现桥梁断面的压力梯度及压力系数功率谱具有明显的雷诺数效应,高雷诺数下,通过风压频谱寻找涡脱频率的方法不可行。研究表明,桥梁断面的Strouhal数具有较为明显的雷诺数效应。





Abstract

In order to study the Reynolds number effect of the Strouhal number of bridge deck section, Reynolds number was changed by adjusting wind speed and pressure taps were set on the surface of model. Wind pressure time history was recorded at different Reynolds numbers. The pressure gradient 、pressure coefficient power spectrum and frequency of vortex shedding were also studied in the same range of Reynolds numbers . Reynolds number effect of Strouhal number was studied too. The investigation indicates that Reynolds number effect of bridge deck pressure gradient and the pressure coefficient power spectrum are considerable, and it is difficulty to identify vortex shedding by use of the frequency spectrum of pressure time-history record at high Reynolds number. Studies show it is clear that Reynolds number effect of Strouhal number exists in bridge deck section.

关键词

桥梁工程 / 雷诺数效应 / Strouhal数 / 风压系数

Key words

Bridge Engineering / Reynolds Number Effect / Strouhal Number / Pressure Coefficient

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刘健新;崔欣;李加武 . 桥梁断面表面压力分布及Strouhal数的雷诺数效应[J]. 振动与冲击, 2010, 29(4): 146-149
Liu Jianxin;Cui Xin;Li Jiawu. Reynolds Number Effect on Surface Pressure Distribution and Strouhal Number of Typical Bridge Deck Section[J]. Journal of Vibration and Shock, 2010, 29(4): 146-149

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