Abstract：The most important influence factor of ejecting performance for eject pump is area proportion. Experiment was carried out to research the relationship between area proportion and ejecting performance of jet pumps under different system pressure. The water quantity, ejecting air quantity and ejecting coefficient of the jet pumps with different nozzle sizes and area proportions were tested through experiment under the condition of different access water pressure, and the experimental values of ejecting air of eject pumps with different structure parameters in different conditions were obtained. The experimental results showed that the maximum value of quantity of water and ejecting air were 1 940 L/h and 1 090 L/h of the jet pump with 5.5 mm nozzle and 0.40 MPa system pressure, respectively, and the maximum value of quantity of water and ejecting air were 1 240 L/h and 1 280 L/h of the jet pump with 4.0 mm nozzle and 0.60 MPa system pressure, respectively. The ejecting coefficient increased with the access water pressure increasing. When a certain pressure was reached, the ejecting coefficient was invariable. When the system pressure was 0.40 MPa, the ejecting coefficients of jet pump with 5.5 mm and 4.0 mm nozzle were 0.56 and 1.07, respectively. Quantity of ejecting air and ejecting coefficient needs to be paid attention to in designing and applying automatic airejecting twophase flow jet pumps.
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