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均匀流中箱梁非定常风压的频域特征和空间相关性

, PP. 68-76

Keywords: 桥梁工程,箱梁,大涡模拟,漩涡脱落,脉动压力,相干分析

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Abstract:

?为研究箱梁脉动风压的频域特征和空间相关性,采用大涡方法模拟了箱梁在0°风攻角和雷诺数为1.27×105下的绕流场,获得了主梁表面脉动压力分布和统计特征,开展了脉动压力时程的频域和空间相干性分析,解释了脉动压力的流动机理。研究结果表明:主梁尾迹的主脱落漩涡主导了主梁表面脉动压力,且涡脱存在频率带宽分布和展向不同步特征;主梁下表面脉动压力同相相关,但顶板脉动压力受分离再附流的干扰,上游风嘴及附近的脉动压力漂移了180°相位,导致上表面前、后风嘴上的脉动压力反相,且流动平均再附点后较大区域,脉动压力相干性小且相位杂乱。

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