To study the formation mechanism of thermal stratification in cooling channel and its effects on the flow and heat transfer

three dimensional turbulent fluid flow and heat transfer in a regenerative-cooling channel of liquid rocket engine were numerically investigated with Reynolds stress model(RSM) model

and the coolant was hydrogen

whose thermophysical properties varied with both temperature and pressure.The results show that thermal stratification occurs at non-flow direction

the extent of thermal stratification becomes increasingly significant as the extent of heating increases

and the thermal stratification of coolant is weakened for the existence of secondary flow in throat region;the thermal stratification has little effect on the bulk temperature increase and hydrodynamic losses of hydrogen

but has significant effect on the calculation of the wall heat fluxes and temperature.