Numerical simulations were carried out to study the flow and heat transfer characteristics inside co-rotating disc cavity.The RNGturbulence model was applied to investigate the pressure loss across the disc cavity and the influences of non-dimensional mass flow coefficient

rotational Reynolds number and turbulent flow parameter on the flow and heat transfer.Results show that flow structure inside the cavity is mainly decided by turbulence flow parameter;under a constant value of rotational Reynolds number and the variation of flow rate

the pressure drop exhibits an "S-curve" behavior in which there are three different values of flow rate for each value of pressure drop;the pressure drop across the cavity can be effectively reduced with the use of de-swirled nozzles;the Nusselt number rises with the increase of non-dimensional mass flow coefficient and rotational Reynolds number.