Numerical investigation on internal flow field of a transonic, low-aspect ratio and axial-flow fan rotor

A code to solve three dimensional Navier-Stokes equation has been developed, which has been used to predict the flow field of a transonic, low-aspect ratio and axial-flow fan rotor. The code was based on an explicit, time-marching and finite volume method. The independent variables of equations were stored at the corners of contorl volume. Turbulence was modeled by Baldwin-Lomax eddy viscosity model. Two step Runge-Kutta method was implemented to solve the algebraic equations. Some accelerating convergence techniques such as multi-grid and local time step method were employed. Performance maps at design rotationg speed were calculated by the code. The emphasis of the paper is on the calculation of flow field at choked point, near stall point and at peak efficiency point. Comparation of predicted data with experimental result illustrates that the code can simulate a transonic, low-aspect ratio and axial-flow fan rotor.