合成射流抑制方柱绕流载荷的试验研究  

Experimental Research on Suppression of Flow Load Around a Square Cylinder by Synthetic Jet

作　　者：周吉慧 刘明月[1,2] 肖龙飞[1,2] 代燚[1] 程紫媛 ZHOU Jihui;LIU Mingyue;XIAO Longfei;DAI Yi;CHENG Ziyuan(State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University,Shanghai 200240,China;SJTU YaZhou Bay Institute of Deepsea SCI-TECH,Sanya 572024,Hainan,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]上海交通大学三亚崖州湾深海科技研究院海,海南三亚572024

出　　处：《船舶工程》2022年第10期149-156,共8页Ship Engineering

基　　金：国家自然科学基金青年科学基金项目(51909158)。

摘　　要：海洋平台的涡激运动会对其系泊系统及立管造成疲劳损害,积极探索涡激运动的抑制方法具有重要意义。合成射流作为一种全新高效的主动式流场控制方法,能够控制流动分离、增大/减小升、阻力。文章采用自主研制的活塞式合成射流激励器,在循环水槽(Re=2.2×10^(4))开展实验来探究不同关键参数的合成射流(动量系数、频率、射流出口方位角)对方柱升、阻力的抑制作用。结果表明,合成射流会破坏方柱泄涡脱落的周期性,进而起到减升减阻的作用。当它恰好作用于流动分离点处时,对方柱升、阻力的抑制效果最佳,升力系数下降率最大可达61%,相应地,阻力系数下降率为12%。The vortex-induced motion(VIM) of an offshore platform cause fatigue damage to mooring system and riser, it’s of great significance to explore methods to suppress VIM. As a novel and efficient active flow control method, synthetic jet can control flow separation and increase/decrease drag and lift fluctuations. A synthetic jet actuator with piston system is developed. The experiments are conducted to suppress the drag and lift fluctuations on a square cylinder by means of synthetic jets with different key parameters(momentum coefficient, frequency, jet exit azimuth) in the circulating water channel at Re=2.2×10^(4). The results show that the synthetic jet can reduce drag and lift fluctuations by destroying the periodicity of the vortex shedding behind a square cylinder. When synthetic jets just locates on the separation point, the suppression effects are the best. The maximum reduction rate of the lift coefficient can reach 61%, and correspondingly, the drag coefficient reduction rate is 12%.

关 键 词：流场控制 合成射流 方柱绕流 减升减阻 

分 类 号：U674[交通运输工程—船舶及航道工程]