Effect of Flow Induced Acoustic Resonance on Vortex Shedding from Staggered Tube Banks
Effect of Flow Induced Acoustic Resonance on Vortex Shedding from Staggered Tube Banks
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DOI：
10.1299/jsmeb.49.142
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
H. Hamakawa;T. Fukano;E. Nishida;H. Ishida
中科院分区：
文献类型：
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作者：
H. Hamakawa;T. Fukano;E. Nishida;H. Ishida
本文主要研究了交错管组中涡流脱落现象与声共振的关系。结果表明，在无共振情况下，存在三种不同类型的涡脱落，其Strouhal数（St）分别为0.29、0.22和0.19。当间隙速度为39.2m/s时，在风管固有频率342.5Hz处产生共振时，在管组内部发现了两种不同频率的涡脱落，主要为342.5Hz （St=0.29）和262.5Hz （St=0.22）左右。旋涡脱落的速度波动和周期性在第二排管排尾迹处表现得最为强烈。如果将短挡板安装在速度波动和旋涡脱落周期性最强烈的位置，可以有效地防止横向模态声共振的产生。
In the present paper, attention was focused on the relation between vortex shedding phenomena and acoustic resonance in staggered tube banks. As a result, three types of vortex shedding were found with different Strouhal numbers (St), 0.29, 0.22, and 0.19, in cases without resonance. When resonance was generated at the natural frequency of the duct, 342.5Hz, at a gap velocity of 39.2m/s, two types of vortex shedding were found with different frequencies, mainly about 342.5Hz (St=0.29) and 262.5Hz (St=0.22), inside the tube banks. The velocity fluctuation and periodicity of the vortex shedding were the most intense in the wake of the second row of tube banks. A short baffle plates was effective for preventing the generation of acoustic resonance of the transverse mode if it was installed at the correct place where velocity fluctuation and periodicity of vortex shedding were most intense.