谢潇潇1,及春宁2,John Williams3.低雷诺数下不同顶角三棱柱体绕流受力和尾涡脱落机制[J].水电能源科学,2018,36(6):73-76
低雷诺数下不同顶角三棱柱体绕流受力和尾涡脱落机制
Hydrodynamic Forces and Vortex shedding Mechanism of Low Re Flow around Triangular Prism with Different Apex Angles
  
DOI:
中文关键词:  低雷诺数  顶角  三棱柱绕流  卡门涡街  临界点  尾涡脱落
英文关键词:low Reynolds number  vertex angle  flow around triangular prism  Karman vortex street  critical point  vortex shedding
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作者单位
谢潇潇1,及春宁2,John Williams3 1. 四川大学 水利水电学院四川 成都 6100652. 天津大学 水利工程仿真与安全国家重点实验室天津 3000723. 伦敦玛丽皇后学院 工程材料学院 英国 伦敦 E14NS 
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中文摘要:
      为研究三棱柱体绕流特性,采用直接数值模拟方法,对雷诺数为100时顶角为15°~165°的三棱柱的二维绕流问题进行了数值模拟,并与经典的圆柱绕流进行对比分析。结果表明,随着顶角度数的增大,三棱柱体受到的时均阻力不断增大,而升力均方值先增大后减小,在顶角为60°时达到最大值(0.31);随着顶角度数的增大,尾涡强度逐渐增大,泄涡频率先增大后减小,在顶角为60°时,泄涡频率最大;前尾涡脱落产生的中心点与鞍点随新尾涡的产生依次消失,而新的尾涡的中心点与鞍点同时逐渐形成。
英文摘要:
      The direct numerical simulation method was used to simulate two dimensional flow of triangular prism with a Reynolds number of 100 and the vertex angles varying from 15° to 165°. The results show that with the increase of the vertex angle, the mean resistance of the cylinder increases while the mean square value of lift force increases first and then decreases, and it reaches the maximum value of 0.31 at the vertex angle of 60°. In addition, with the increase of the vertex angle, the wake vortex intensity increases gradually, the discharge vortex frequency increases first and then decreases, and the discharge vortex frequency reaches the maximum value when the vertex angle is 60°. The center point and Saddle Point of the trailing vortex shedding disappears with the new wake vortex, while the center point of the new wake vortex and the saddle point generate simultaneously.
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