ZHANG Jin-Hua-1, GAO Chuan-Chang-1, YAN Yong-2, WANG Xiao-Hui-2
(1. Institute of Electric Power, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou, Henan 450011, China; 2. Chongqing Branch, Shanghai Investigation, Design ＆ Research Institute, Chongqing 400039, China)
An analytical expression of energy loss to pressure ratio in the pulse liquidgas jet pump was deduced by using the energy conservation principle and the chef factors influencing the energy conversion of flow were clarified. The effects of energy losses in major flow components on the pump performance were studied, and then were confirmed by experiments and numerical simulations. The optimum area ratio (the throat area over jet area) is 4.34, at which the pump exhibits a higher pressure ratio over a large range of flow rate ratios, based on the experiments made on the pumps with five different arearatios. The results showed that the energy losses in the major flow components estimated theoretically are basically in agreement with the measurements. The energy loss ratios in the flow components were calculated, and their relations with area ratio and flow rate ratio were analyzed. The major parameters affecting the energy balance and performance of a liquidgas jet pump included the frequency of pulse jet, area ratio, flow rate ratio and throat length. By comparing the experimental data of the pump driven by a pulse jet with those driven by a steady jet at various area ratios, it was verified that using pulse jet is an effective way to improve the liquidgas jet pump efficiency.
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