摘要
应用能量平衡分析方法,得到脉冲液-气射流泵内能量损失的压力比表达式,分析其传能及传质的机理和主要影响因素,研究了主要流动部件的能量损失变化对脉冲液-气射流泵性能的影响,并进行了相应的试验研究和数值研究.研究可知最优面积比的液-气射流泵应是在较大的流量比区间具有较好的压力比,通过5个面积比的试验得到最优面积比为4.34.研究结果表明:主要流动部件的能量损失的理论分析与试验结果基本一致;计算了主要流动部件的能量损失压力比,分析其与面积比和流量比的关系;脉冲射流频率、射流泵的面积比、流量比和射流泵喉管长度是影响射流泵能量平衡和液-气射流泵能量特性的主要因素.通过各面积比下,脉冲与恒定液-气射流泵能量损失压力比、性能、效率的试验数据进行对比研究,验证了脉冲射流是提高液-气射流泵效率的有效途径.
An analytical expression of energy loss to pressure ratio in the pulse liquid-gas jet pump was deduced by using the energy conservation principle and the chef factors influencing the energy conver- sion of flow were clarified. The effects of energy losses in major flow components on the pump perfor- mance 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 area-ratios. The results showed that the energy losses in the major flow components estimated theoreti- cally 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 para- meters affecting the energy balance and performance of a liquid-gas 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 liquid-gas jet pump efficiency.
出处
《排灌机械工程学报》
EI
北大核心
2012年第4期422-427,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(50379013)
水利部公益性行业科研专项经费资助项目(201201085)
