循环水温对液环泵性能的影响机理分析OA

To analyze the influence mechanism of the internal circulating water temperature on the per-formance of a liquid ring pump,an experimental platform for testing its fluid-thermal characteristics was established,and the fluid-thermal characteristics of the liquid ring pump were analyzed based on the fluid-thermal coupling numerical simulation method.Results of the analysis show that after the 2BEA-202 liquid ring pump is started during the tests,its inlet vacuum degree,shaft power,and suc-tion capacity gradually reach a stable state after running for about 55 seconds at different circulating water temperatures,but it takes about 560 seconds to reach a thermal equilibrium state.As the circu-lating water temperature increases,the shaft power,suction capacity,and efficiency of the liquid ring pump all show a gradual decreasing trend.When the circulating water temperature increases from 15℃to 60℃,it causes a 5.7%decrease in the suction capacity of the liquid ring pump,and a 2.9%decrease in efficiency.Numerical simulation analysis shows that the gas is continuously compressed from the pump inlet to the outlet,and the specific volume gradually decreases.As the circulating water tempera-ture rises,the p-v curve gradually shifts upward,and the gas gradually expands.Under the condition that the working chamber volume of the liquid ring pump remains unchange,its suction capacity gra-dually decreases.As the circulating water temperature rises,the sum of dissipation work and compression work in the liquid ring pump shows a gradual upward trend,and the pump efficiency gradually decreases.