上游切角对串列双方柱气动性能影响研究

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摘要串列双方柱气动干扰效应与方柱本身的绕流特征有很大的关系，方柱角部局部外形变化将对串列双方柱的气动干扰效应产生明显的影响，相关的研究仍较少。采用基于雷诺平均SST k-ω湍流模型的二维非定常绕流数值模拟方法，研究了上游方柱无、有切角（切角率10%）对串列双方柱气动性能的影响，通过间距比为2.0时无切角工况的数值模拟结果与文献试验结果的对比，验证了模拟方法及参数设置的有效性；根据升、阻力系数的对比分析，确定了上游无、有切角时串列双方柱的气动力突变临界间距比分别为4.6和4.1；对两临界间距比情况的无、有切角串列双方柱，分别进行了基于空间平均的三维非定常绕流大涡模拟，从风压分布角度详细分析了上游方柱切角处理对串列双方柱气动性能的影响，从方柱周围的时均和瞬态流场角度进行了机理分析。上游方柱切角后，在剪切层发生分离再附，尾流变窄，旋涡脱落更趋复杂，引起流场流态的变化，风压分布受到影响，方柱升、阻力系数降低，临界间距缩短。

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	郑德乾
	祝瑜哲
	刘帅永
	马文勇
	方平治

关键词 ：串列双方柱, 切角处理, 数值模拟, 临界间距, 气动性能, 流场机理

Abstract：There is a close relationship between aerodynamic interference effect of two tandem square cylinders and characteristics of flow around square cylinder. The local shape change of corner of square cylinder can significantly affect aerodynamic interference effect of two square columns in series. Until now, the related studies are very few. Here, the 2-D unsteady numerical simulation method based on Reynolds average SST k-ω turbulence model was adopted to study effects of no corner cut and corner cut (10%) on aerodynamic performance of the two tandem square cylinders. Comparing the numerical simulation results under conditions of no corner cut and the spacing ratio of 2.0 with test results in literature verified the effectiveness of the simulation method and parameter setting. Then, according to the contrastive analysis of lift and drag coefficients, critical spacing ratios of the two square columns in series without and with corner cut in upstream were determined to be 4.6 and 4.1, respectively. Finally, the 3-D unsteady flow around the two cylinders without and with corner cut was simulated using the spatially averaged large eddy simulation
to analyze effects of upstream corner cutting on aerodynamic performance of the two cylinder in detail from the angle of wind pressure distribution. The mechanism analysis was performed in the aspect of time averaged and transient flow fields around the two cylinders. It was shown that after corner cutting of the upstream square cylinder, the flow separates and reattaches in, wake flow becomes narrow, and vortex shedding becomes more complex to cause flow field’s state varying, wind pressure distribution being affected, square cylinder’s lift and drag coefficients dropping, and critical spacing being shortened.

Key words： two tandem square cylinders corner cutting numerical simulation critical spacing aerodynamic performance flow field mechanism

收稿日期: 2020-11-02 出版日期: 2021-08-15

引用本文:

郑德乾，祝瑜哲，刘帅永，马文勇，方平治. 上游切角对串列双方柱气动性能影响研究[J]. 振动与冲击, 2021, 40(15): 216-223 .
ZHENG Deqian, ZHU Yuzhe, LIU Shuaiyong, MA Wenyong, FANG Pingzhi4. Effects of upstream corner cut on aerodynamic performance of two tandem square cylinders. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 216-223 .

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I15/216

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