Heat transfer characteristics of axi-symmetrical nozzle and RS nozzle

To understand and compare different heat transfer characteristics of regenerative cooling in axi-symmetrical nozzle and round to square nozzle (RS nozzle), computational models of axi-symmetrical nozzle (thrust chamber) and RS nozzle (thrust chamber) were established. Numerical simulation was employed to investigate and compare fluid field, wall temperature, heat flux, coolant heat pick-up and pressure loss in the cooling circuit of axi-symmetrical nozzle and RS nozzle. The results show: In case of RS nozzle, because its contour is not continuous, peak values of wall temperature and heat flux exist at the location next to shape transformation, which leads to non-uniform temperature and heat flux distribution along the wall circumference.