Thermal-hydraulic analysis of the HL-2M divertor using an homogeneous equilibrium model

The heat flux of the HL-2M divertor would reach 10 MW m^-2 or more at the local area when the device operates at high parameters. Subcooled boiling could occur at high thermal load, which would be simulated based on the homogeneous equilibrium model. The results show that the current design of the HL-2M divertor could withstand the local heat flux 10 MW m^-2 at a plasma pulse duration of 5 s, inlet coolant pressure of 1.5 MPa and flow velocity of 4 m s^-1. The pulse duration that the HL-2M divertor could withstand is closely related to the coolant velocity. In addition, at the time of 2 min after plasma discharge, the flow velocity decreased from 4 m s^-1 to 1m s^-1, and the divertor could also be cooled to the initial temperature before the next plasma discharge commences.