Study on flow and heat transfer characteristics of a closed rotating static system disk cavity with axial temperature difference
The flow and heat transfer characteristics of closed rotor-stator system cavity with axial temperature difference were investigated using numerical simulation.The flow structure,temperature distribution and radial distribution function of Nusselt number of rotor and stator in the disc cavity under different working conditions were investigated by changing the thermal Rossby number.The results showed that the closed rotor-stator system cavity with axial temperature difference was consistent with the basic flow structure of the isothermal closed rotor-stator system cavity,belonging to the typical Batchelor flow pattern,and consists of the boundary layer on the rotor-stator surface and the rotating core in the middle;Compared with the isothermal closed rotor-stator system cavity,the rotation ratio in the core area increased,and with the increase of the thermal Rossby number,the rotation ratio in the core area gradually increased,and the dimensionless circumferential velocity of the fluid in the rotor-stator boundary layer increased;With the axial temperature difference,the temperature distribution of the disk cavity changed,and the temperature gradually decreased along the radial direction,and first decreased along the axial direction.The temperature in the core area remained unchanged,and continued to decrease near the side of the rotor;When the thermal Rossby number was constant,the Nusselt number of the rotor and stator gradually increased radially.As the thermal Rossby number increased,the Nusselt number of the rotor and stator decreased.
axial temperature differenceclosed rotor-stator disk cavitythermal Rossby numberflow structurethe Nusselt number
NETL
NSTL
万方数据
