论文标题
悬崖体流中的基本压力的估计
Estimation of the Base Pressure in Bluff Body Flows
论文作者
论文摘要
提出了一种估计悬崖体流中基本压力的方法。该估计使用伯诺利方程在分离边缘处使用速度来计算基本压力。假设这是当流场中的速度波动减少时将接近的基本压力。沿分离的自由流线的恒定速度 - 如二维虚张声势在用分离板中唤醒的速度 - 是允许使用该方法的一种。建议的方法在带有和不带分离板的二维流动设置中应用于虚张声势。通过降低速度波动，估计在没有分离板的二维流动中，据估计，在二维流中，估计的基本压力高达58％，并在分离板的情况下高达42％。将没有分离板的二维流量的估计基本压力与具有主动流控制的情况进行了比较。在这种情况下，由Kármán涡流街引起的速度波动降低。比较表明可以实现基本压力的估计。
A method for estimating the base pressure in bluff body flows is proposed. The estimation uses the velocity at the separation edge with the Bernoulli equation to compute the base pressure. The assumption is that this is the base pressure that will be approached when velocity fluctuations in the flow field are reduced. A constant velocity along the separating free streamline - as in two-dimensional bluff body wakes with a splitter plate - is a requirement to permit the application of the method. The suggested method is applied to a bluff body in a two-dimensional flow setup with and without a splitter plate. By reducing the velocity fluctuations, there are estimated increases in the base pressure of up to 58 % for the bluff body in two-dimensional flow without a splitter plate and up to 42 % with a splitter plate. The estimated base pressure of the two-dimensional flow without a splitter plate is compared to a case with active flow control. In this case, the velocity fluctuations caused by the Kármán vortex street are reduced. The comparison shows that the estimation of the base pressure can be achieved.
