Study to the performance of the fuel diffusion in ascramjet combustion chamber with struts

In the present paper, the internal flow fields of scram jet combustion chamber with struts have been simulated numerically by using the Favre-Averaged Navier-Stokes equations with the Baldwin-Lomax algebraic turbulence model. In the computing to the flowfields in the combustor, the effects of the strut injector number and the fuel-injecting angle on the fuel/air mixing process are studied comparatively. During the simulations, the second order H. C. Yee's TVD scheme and M. S. Liou's AUSMPW scheme are used for the inviscid flux terms and a central difference is used for the diffusion terms. Furthermore, using the local integral of the nonequlibrium source terms within local fluid time step and the LU factorization technique, an implicit LU-SSOR hybrid arithmetic without computing the inversion of the iteration matrix is established, guaranteeing the high efficiency of the method in simulating nonequlibrium flowfields. The results demonstrate that increasing the strut injector number and the fuel-injecting angle can enhance the fuel/air mixing.