Abstract: Aiming at the complex fluid thermal coupling problem in the working process of the liquid ring pump, the flow and heat transfer characteristics of the liquid ring pump were studied by combining numerical simulation and experimental tests. The experimental tests of thermodynamic characteristics for the liquid ring pump were built, and the temperature of the liquid ring and the outlet were monitored using a thermocouple temperature measuring system. The heat balance behaviors during pump startup were analyzed, and the thermodynamic characteristics under varying cooling water flow rates and operating conditions were studied. Based on the experimental result, the transient simulation for the couple of flow and thermal was carried out. The analysis results show that the system reaches thermal equilibrium about 300 seconds after the pump starts, with outlet gas and water temperatures stabilizing. With the increase of cooling water flow rate, the temperature of each monitoring point in the pump chamber gradually decreases. With the increase of suction flow rate, both outlet air temperature and water temperature of the pump decrease gradually, while the temperature of the liquid ring decreases first and then increases. With the increase of suction flow rate, the heat loss power also decreases first and then increases, which is consistent with the trend of liquid ring temperature. The distribution of compression power in a liquid ring pump is basically consistent with that of the temperature field in a liquid pump.

Key words: liquid ring pump, fluid thermal coupling, thermodynamic characteristics, heat balance temperature, compression power