邵林媛, 孙一飞, 常幸, 韩鹏, 王仰雪, 刘庆宽. 斜拉索气动特性的雷诺数效应试验研究[J]. 工程力学, 2023, 40(S): 120-125. DOI: 10.6052/j.issn.1000-4750.2022.06.S034
引用本文: 邵林媛, 孙一飞, 常幸, 韩鹏, 王仰雪, 刘庆宽. 斜拉索气动特性的雷诺数效应试验研究[J]. 工程力学, 2023, 40(S): 120-125. DOI: 10.6052/j.issn.1000-4750.2022.06.S034
SHAO Lin-yuan, SUN Yi-fei, CHANG Xing, HAN Peng, WANG Yang-xue, LIU Qing-kuan. EXPERIMENTAL STUDY ON REYNOLDS NUMBER EFFECT OF AERODYNAMIC CHARACTERISTICS OF STAY CABLES[J]. Engineering Mechanics, 2023, 40(S): 120-125. DOI: 10.6052/j.issn.1000-4750.2022.06.S034
Citation: SHAO Lin-yuan, SUN Yi-fei, CHANG Xing, HAN Peng, WANG Yang-xue, LIU Qing-kuan. EXPERIMENTAL STUDY ON REYNOLDS NUMBER EFFECT OF AERODYNAMIC CHARACTERISTICS OF STAY CABLES[J]. Engineering Mechanics, 2023, 40(S): 120-125. DOI: 10.6052/j.issn.1000-4750.2022.06.S034

斜拉索气动特性的雷诺数效应试验研究

EXPERIMENTAL STUDY ON REYNOLDS NUMBER EFFECT OF AERODYNAMIC CHARACTERISTICS OF STAY CABLES

  • 摘要: 斜拉索是斜拉桥的主要受力构件,其气动特性研究是整体结构气动特性研究的基础。为探究表面光滑斜拉索气动特性的雷诺数效应,在均匀来流中进行了不同风速下的斜拉索节段模型风洞测压试验,得到了斜拉索气动力系数和平均风压系数随雷诺数的变化规律。结果表明:表面光滑斜拉索的平均气动力系数在不同雷诺数区有不同的表现,平均阻力系数在亚临界雷诺数区和超临界雷诺数区分别稳定在1.2和0.6附近,而平均升力系数为0,临界雷诺数区平均阻力系数迅速减小,对应地,平均升力系数从0增加到最大值又降低到0;对于脉动气动力系数,处于亚临界雷诺数区的脉动升力值远大于脉动阻力,意味着斜拉索横风向激励远大于顺风向;平均风压系数分布随雷诺数的增大经历了对称−不对称−对称的变化过程,体现了层流分离−单侧湍流分离−双侧湍流分离的变化规律,是平均升力系数变化趋势的定性响应,而斜拉索背压处平均基压系数绝对值的变化趋势与平均阻力系数一致。

     

    Abstract: The stay cable is one of the main force members of cable-stayed bridges, and the study of its aerodynamic characteristics is the basis for the study of the aerodynamic characteristics of the overall structure. In order to explore the Reynolds number effect of aerodynamic force of stay cable with smooth surface, the wind tunnel pressure measurement test of stay cable section model under different wind speeds was carried out under uniform incoming flow, and the variation law of mean drag coefficient and mean wind pressure coefficient of cable-stay with Reynolds number was obtained. The results show that the mean aerodynamic coefficient of the stay cable with smooth surface has different performance in different Reynolds number regions. The mean drag is stable at 1.2 and 0.6 in the subcritical Reynolds number region and the supercritical Reynolds number region, respectively. The mean lift coefficient is 0. The mean drag coefficient decreases rapidly in the critical Reynolds number region. Correspondingly, the mean lift coefficient increases from 0 to the maximum and then decreases to 0. For the fluctuating aerodynamic force, the value of the fluctuating lift in the subcritical Reynolds number region is much larger than the fluctuating drag, which means that the cross-wind excitation of the stay cable is much larger than the along-wind excitation. The distribution of the mean wind pressure coefficient experienced a symmetric-asymmetric-symmetric variation process with the increase of Reynolds number, which reflected the variation law of laminar separation, unilateral turbulent separation and bilateral turbulent separation, and was a qualitative response to the variation trend of the mean lift coefficient. The variation trend of the absolute value of the mean base pressure coefficient at the back pressure of the stay cable was consistent with the mean drag coefficient.

     

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