回转体头部压力分布规律及其对转捩点的影响

以圆头回转体为研究对象,头部线型采用双参数椭圆曲线,利用面元法求解绕流势流流场,利用F.W.Scholkemeier的积分方法,确定该压力分布下的层流边界层,利用P.S.Granville方法求解边界层转捩点.通过变换头部线型参数,以最小压力系数绝对值的下降方向为搜索方向,研究不同头型压力分布的变化规律及其对转捩点的影响.结果表明:最小压力系数绝对值越小的头型其最小压力点离头部驻点的距离越近;不同头型的转捩点不光与其压力分布有关,而且还与其头部长径比有关.

The Pressure Distribution Rule and Its Effect on Transitional Point of a Head Part of Revolution

Based on bodies of revolution, the dual-parameter elliptic curve is used for head line-type, the potential flow is calculated by using surface-element method, and the laminar boundary layer is determined by using integral method of F. W. Scholkemeier. The corresponding value of transitional point is determined by using the method of P. S. Granville. Through varying the parameter of head line-type, the drop direction of the absolute value of minimal pressure is adopted as the search direction, the change rul...