轴向通流旋转盘腔换热特性

Targeting the flow structure and heat transfer of the aero-engine compressor rotating cavity,an isothermal rotating cavity with axial throughflow was investigated experimentally. By comparing the changes of the local Nusselt number and average Nusselt number in different working conditions, the effects of various forces in a rotating system on the flow structure and heat transfer were analyzed, and correlations of the Nusselt number and non-dimensional parameters were obtained.The results showed that the flow structure and heat transfer were mainly affected by the inertia force, centrifugal force and Coriolis force. The rotating cavity can be divided into two zones: the inertial convection zone located in the low radius cavity where the inertia force occupies the leading position and the rotational convection zone located in the high radius cavity where the Coriolis force occupies the leading position.The inertia force rises with the mainstream rate and the Coriolis force rises with the angular speed.Heat transfer is enhanced with increase of the inertia force and coriolis force respectively.These two forces' effects on heat transfer suppress each other.With the coaction of these two forces,heat transfer changes with various working conditions and radius. The changes of average Nusselt number and local Nusselt number are consistent with the variation of variables.