关键词: 波瓣喷管;引射喷管;排气引射系统;气动性能;数值仿真

Abstract: The fundamental equations were derived in the body fitted nonorthogonal coordinates from cylindrical coordinates for the circularly lobed nozzle with/without a cone in the center of the lobe. These equations were solved using SIMPLEC and a kind of complete pressure corrections algorithm in the nonstaggered and severe skewed grids. Better agreements were observed between the numerical results and the experimental values. The numerical results show that the streamwise vortices form quickly in the cylindrical mixer and the low temperature contour lines can reach the central line of the cylindrical mixer in the guide of the wall of the cone.There are better agreements between the calculated and measured axial velocity and temperature distributions in the exit section of the cylindrical mixer.

Key words: Lobed nozzle;Shrouded nozzle;Exhaust ejector system;Aerodynamic performance;Numerical simulation