流向振荡柱体尾流控制研究进展

详细介绍了近几年采用尾部喷射、隔离板和小窄条控制件等3 种方法对流向振荡柱体绕流旋涡脱落的抑制情况. 在研究范围内存在非锁频和3种锁频旋涡脱落模式. 风洞实验表明, 尾部喷射对这4 种模式都有抑制效果,窄条控制件对非锁频和2种锁频模式具有抑制效果, 而隔离板仅对非锁频和1 种锁频模式有效. 在不同流动和振荡条件下找出了每种方法的有效控制区, 研究了减阻和减少脉动力的效果, 并探讨了控制机理. 

Advances in the control of wakes behind an in-line oscillating cylinder

The methods of base blowing, splitter-plate and small strip-element are used to suppress vortex shedding from a circular cylinder oscillating in line with an on-coming uniform stream. The non-lock-on mode and three lock-on modes of vortex shedding are found in the test ranges of Reynolds number and cylinder oscillation frequency. Wind tunnel experiment results show that, the base blowing is effective for all the modes of vortex suppression, the strip element is effective for the non-lock-on and two lock-on modes, and splitter plate for only the non-lock-on and one lock-on modes. The effective zones for every method are found out at different flow and oscillation conditions, the reductions of mean drag and fluctuating lift are investigated, and the control mechanism is discussed.