气力提升泵性能影响因子的初步试验

气力提升泵的水输送量反映了提升管进口的流速情况,而进口流速是衡量吸鱼效果的重要因素。以水槽试验的方法研究了不同因子对水输送性能的影响,共测试了使用6种平板孔喷嘴、2种环状孔喷嘴、5种潜水比3、种喷嘴水下潜没深度和3种管径的水输送量数据,并进行了活鱼抽吸试验。分析结果表明,D2和D3平板孔喷嘴由于合理的孔分散程度而相对提高了水输送量,但与其它喷嘴差异不显著。具备理想的气泡尺寸和分散程度的D6环状孔喷嘴获得了最佳的水输送性能。增加潜水比和喷嘴水下潜没深度或减小提升管管径对水输送性能的提高有决定性影响。当集鱼装置始终维持高鱼水比例时,气力提升泵具有较好的活鱼抽吸能力。

Preliminary experiment on several factors affecting the performance of air lift pump

The water flow velocity in the suction pipe,which is crucial for evaluating the performance on pumping fish,can be measured by the pumped water flow rate of the riser in an air lift pump system.Several factors affecting the performance of water transportation were investigated through experimental methods in a water tank.Different designs involving six kinds of plane air injectors,two annular air injectors,five submergence ratios,three submergence depths and three sizes of riser were tested and water flow rates were recorded.Experiments on pumping live fish were also carried out.The results indicated that the D2 and D3 plane air injectors increased the pumped water flow rate due to its proper orifice distribution,but the difference between all plane air injectors was not distinct.The D6 annular air injector based on its ideal bubble size and distribution had the optimal capability for pumping water.Increasing the submergence ratio and the submergence depth or decreasing the diameter of the riser was determinant to improve the performance of the pump.Preferable capacity for pumping fish could be achieved while higher proportion of fish to water was kept in the fish-assembling device.