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积分尺度对矩形迎风面脉动风压特性的影响

杜树碧 李明水 杨雄伟

杜树碧, 李明水, 杨雄伟. 积分尺度对矩形迎风面脉动风压特性的影响[J]. 西南交通大学学报, 2021, 56(4): 769-776. doi: 10.3969/j.issn.0258-2724.20190677
引用本文: 杜树碧, 李明水, 杨雄伟. 积分尺度对矩形迎风面脉动风压特性的影响[J]. 西南交通大学学报, 2021, 56(4): 769-776. doi: 10.3969/j.issn.0258-2724.20190677
DU Shubi, LI Mingshui, YANG Xiongwei. Effect of Turbulence Integral Scale on Fluctuating Wind Pressure and Its Distribution Characteristics on Rectangular Upwind Surface[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 769-776. doi: 10.3969/j.issn.0258-2724.20190677
Citation: DU Shubi, LI Mingshui, YANG Xiongwei. Effect of Turbulence Integral Scale on Fluctuating Wind Pressure and Its Distribution Characteristics on Rectangular Upwind Surface[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 769-776. doi: 10.3969/j.issn.0258-2724.20190677

积分尺度对矩形迎风面脉动风压特性的影响

doi: 10.3969/j.issn.0258-2724.20190677
基金项目: 国家自然科学基金(51878580)
详细信息
    作者简介:

    杜树碧(1986—),女,讲师,研究方向为桥梁与结构风工程,E-mail:dus_rcwe@swjtu.edu.cn

    通讯作者:

    李明水(1966—),男,教授,研究方向为桥梁与结构风工程,E-mail:lms_rcwe@126.com

  • 中图分类号: U448.11

Effect of Turbulence Integral Scale on Fluctuating Wind Pressure and Its Distribution Characteristics on Rectangular Upwind Surface

  • 摘要: 为了研究来流紊流积分尺度对矩形断面高层建筑迎风面脉动风压及其分布特性的影响,选取2∶1和1∶2矩形为对象,通过风洞测压试验,对不同积分尺度紊流场中矩形迎风面的平均风压系数及脉动风压均方根系数、脉动风压相关函数和相干函数、脉动风压功率谱进行了对比分析. 研究结果表明:对于矩形同一高度处,脉动风压功率谱在低频区始终受准定常效应控制,而在高频区脉动风压功率谱随积分尺度的增大而增大;风压的相关性高于风的相关性,风压的相关函数与相干函数也随积分尺度的增大而增大,但相关宽度随积分尺度的增大而减小;脉动风压均方根系数随积分尺度的增大而增大;对于同一流场中矩形不同测点处,离驻点越远,风压相关函数和相干函数越小,脉动风压均方根系数越大;来流紊流积分尺度对平均风压系数的影响较小.

     

  • 图 1  模型测点分布

    Figure 1.  Distribution of pressure-measuring taps

    图 2  测压条带分布

    Figure 2.  Distribution of pressure strips

    图 3  格栅紊流场参数

    Figure 3.  Parameters of grid-generated turbulent flow fields

    图 4  测点脉动风压功率谱

    Figure 4.  Fluctuating wind pressure power spectra

    图 5  相关系数

    Figure 5.  Correlation coefficients of wind pressure

    图 6  1∶2矩形在格栅Ⅳ流场的相关系数

    Figure 6.  Correlation coefficients of wind pressure of rectangular model in grid Ⅳ-generated flow feild

    图 7  不同流场中30 mm间距下的相干函数

    Figure 7.  Coherence function with 30 mm spacing in different turbulent flow fields

    图 8  同一流场中30 mm间距下的相干函数

    Figure 8.  Coherence function with 30 mm spacing in the same flow feild

    图 9  脉动风压相关宽度与来流纵向脉动风速相关宽度之比

    Figure 9.  Ratio of the correlation width of fluctuating wind pressure to that of longitudinal fluctuating wind speed

    图 10  平均风压系数

    Figure 10.  Mean wind pressure coefficients

    图 11  脉动压力均方根系数

    Figure 11.  Root mean square coefficients of fluctuating wind pressure

    表  1  试验工况

    Table  1.   Test conditions

    工况格栅编号格栅网格尺寸/m格栅杆件尺寸/mm测量点与格栅间距离 x/m来流风速U/(m•s−1
    10.08202.59.5
    20.16253.09.5
    30.33704.29.5
    40.45854.29.5
    下载: 导出CSV

    表  2  格栅紊流场参数

    Table  2.   Parameters of grid-generated turbulent flow fields

    工况$L_{\rm{u} }/{\rm{m}}$$L_{\rm{v} }/{\rm{m}}$$L_{\rm{w} }/{\rm{m}}$IuIvIw
    1 0.024 0.009 0.014 0.066 0.056 0.061
    2 0.047 0.019 0.020 0.044 0.037 0.039
    3 0.103 0.037 0.036 0.081 0.070 0.070
    4 0.116 0.045 0.045 0.112 0.099 0.100
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-07-16
  • 修回日期:  2019-10-01
  • 网络出版日期:  2019-10-21
  • 刊出日期:  2021-08-15

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