후류가 아음속 디퓨저의 압력회복에 미치는 영향에 관한 연구

The present study addresses a computational work to investigate the influence of a turbulent wake flow on the pressure recovery of a subsonic diffuser. The turbulent wake is generated by a cylinder with a small diameter, which is installed at the inlet of a 2-dimensional diffuser. Computations are applied to the twodimensional, Navier-Stokes Equations. The fully implicit finite volume scheme is used to discretize the governing equations. Several kinds of turbulence models and wall functions are employed to validate the computational predictions. Realizable κ- e turbulent model with the Non-equilibrium wall function is well compared to the experimental results. The results show that the pressure recovery of the subsonic diffuser is dependent on the diameter and location of cylinder. It is found that a certain diameter and location of the cylinder to generate the turbulent wake gives a better pressure recovery, compared with no cylinder flow.