Investigation of Center Body Diffuser for Testing Rocket Engines by Computational Fluid Dynamics
This paper reports Computational Fluid Dynamics (CFD) studies which test the effect of different centre bodies on the performance of testing a 50 N thrust rocket engine at space condition. Mach contours are obtained for various operating conditions. The flow is supersonic at the exit of the nozzle and the exit plane pressure is below atmospheric pressure. Centre body designed with different cylindrical diameter and cone angle were analyzed to determine which performed better. The CFD results show that the length of the centre body also has significant effects on the diffuser performance. The diffuser with the shortest concentric centre body gives the highest static pressure recovery coefficient, the lowest loss of total pressure and the most uniform outlet flow speed, while the longest concentric centre body gives worse diffuser performance. Furthermore, the diffuser without centre body gives the worst diffuser performance among all diffusers with centre body.
CFD, Diffuser, Concentric Centre Body, Thrust rocket, Supersonic speed.