The flow and heat transfer characteristics of a complex turbine cooling system were numerically simulated

which was a multi-cavity

multi-inlet and multi-outlet system installed in a typical small turbofan engine.The cooling system includes the cavity behind the high pressure turbine disc

the cavity in front of the low pressure turbine disc

supporting guide vane cavity

bearing cavity

and some connecting cooling air passages.In this study

the computational grids in both fluid domain and solid domain were established together

the heat transfer between the two domains was calculated conjointly.Based on the results

the influence of structural parameters and pneumatic parameters on the temperature distribution of the system

especially for the bearing cavity

was analysed

and then some measures were taken to lower down the temperature of beating cavity.This study shows the potential power of numerical simulation of fluid flow and heat transfer in complex flow system

helping to improve system design.