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.