离心压气机S1流面流场的计算

本文对计算轴流压气机 S1流面的流函数矩阵解法的计算机程序作了修改,使之能适合于计算离心压气机的 S1流面。本方法是引入人工密度,积分运动方程求速度场,而后求密度场,进行迭代求解,计算速度非常迅速。对离心压气机的几个算例表明:只要不发生明显分离,计算结果与实验值是符合的。 

FLOWFIELD MATRIX SOLUTION ON S1 STREAMSURFACE IN A CENTRIFUGAL COMPRESSOR

The existing flowfield matrix solution method on S 1 stream surface for the calculation of flowfield in an axial compressor is extended to calculation of flowfield in a centrifugal compressor.The stream function governing equation of fluid flow has been established with respect to non-orthogonal curvilinear coordinates.By the aid of artificial compressibility method,the discretzation of the partial differential equation is accomplished with the standard central difference formula.The set of linear algebraic equations obtained is solved by means of the direct matrix method.The velocities at grid nodes are first determined by integrating the momentum equation and then the densities are obtained from the energy equation.Nine numerical examples of three types of the centrifugal compressors show that the solution obtained by the present method is in good agreement with experimental data,provided that there is no large flow separation in compressors.