The calculation of the axisymmetrical subsonic viscous flow field of annular diffusers with prewhirling current at the inlets

The calculation of this class of diffusers was solved. From the momentum e.g., in the circumferential direction it is proven that the angular momentum component rC, is constant along the streamline. By using this momentum eq. directly to the streamline iteration procedure for solving the main flow the difficulty that the stream surface should be correctly given in advance as done in the positive S sub 2 stream surface problem is overcome. The difference equs. of the quasi three dimensional B. L. equs. was obtained and solved by the three dimensional eddy viscosity model established by ceberi, T. and the simple elimination of the other column elements with the main column element. The separation condition and the calculation of a class of energy dissipation coefficient for design of high performance diffusers is presented.