Numerical analysis on the flow characteristics of rotating axial orifices under non-rotation method

As an important throttling component in the engine internal cooling system, rotating orifices are widely used in rotating parts like turbine disks, drums, shafts and so on. Considering the difficulty in carrying out the experiment and measurement, a non-rotation method to measure the discharge coefficient of an rotating axial orifice was presented in this paper. Numerical simulation was conducted to study the difference of flow characteristics between rotation method and non-rotation method as well as the influence of the incidence angle in the range of 0°-70°. Results show that: within the range of parameters studied, the distributions of relative total velocity and relative total pressure using non-rotation method are quite similar to those under rotation method. The deviation of relative total velocity between the two methods is less than 5%. The deviation of relative total pressure is less than 0.5%, and that of discharge coefficient is less than 3.54%.