中间压力对往复式液氢泵容积效率的影响

Influence of intermediate pressure on volumetric efficiency of reciprocating liquid hydrogen pump

通过理论计算研究了压缩过程绝热系数、中间压力对双级往复式液氢泵第二级容积效率的影响。计算结果表明,当无中间压力,入口压力为0.3 MPa,出口压力为45 MPa和90 MPa时,可能会出现容积效率为0,液氢泵呈现空转的现象。根据理论计算与分析得出结论,通过降低绝热系数、提高中间压力有助于提高容积效率,防止余隙容积内残余液氢在气缸吸液过程中汽化,更高的出口压力需要更高的中间压力以提高容积效率。

The influence of adiabatic coefficient and intermediate pressure on the volumetric efficiency of the second stage of the two-stage reciprocating liquid hydrogen pump was studied through theoretical calculations.The calculation results show that when the outlet pressure is 45 MPa and 90 MPa without intermediate pressure,and the inlet pressure is 0.3 MPa,the volumetric efficiency turned to be zero and the liquid hydrogen pump may not work.Reducing the adiabatic coefficient and increasing the intermediate pressure can improve the volumetric efficiency and prevent the residual liquid hydrogen in the clearance volume vaporizing during the piston retreat.Higher outlet pressures require higher intermediate pressures to increase volumetric efficiency.