钝尾物体底部压力计算

CALCULATION OF THE BASE PRESSURE FOR BODY WITH BLUNT-TAIL

提出了一种简便可靠的计算钝尾物体表面压力分布及底部压力的方法。将钝尾物体绕流流场分为无粘区、边界层区和分离区。无粘区和边界层区分别用位流理论和边界层理论计算。分离区由根据尾流函数等建立的替代模型模拟。利用奇点法解出整个模型的压力分布。计算釆用迭代法进行。对Vanwagenen模型和鲁尔大学模型进行了计算,结果表明该方法是成功的。

The purpose of this work is to provide a simpler and thriftier method to be used for calculations of the pressure distribution for body with blunt-tail. According to method of multicomponent-type, the flowfield is divided into three principal domains as follows: the inviscid, the boundary layer and the dead water. The calculations for the inviscid external flow and the boundary layer are carried out by applying potential theory and boundary layer theory, respectively. Imaginary body simulated layer wake region behind the model can be computed by the wakefunction. Thus we obtain a whole calculations model, which cosists of a practical model connected in series with a supplemental one.A singularity method is used for calculation of the pressure for whole model. The inviscid-viscous fluid are coupled by iteration method. The calculation of base pressure for model of Vanwagenen gives good results. We proceed to calculate for Ruhr-Uni model. Ruhr-Uni model was tested in 1500 mm X 1200 mm wind tunnel of Ruhr University. Good agreement of results between calculations and experiments is obtained.