排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (6): 650-654    DOI: 10.3969/j.issn.1674-8530.2012.06.007
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附壁振荡液气射流泵工作性能试验研究
 向清江, 恽强龙, 李红, 吴燕兰

(江苏大学流体机械工程技术研究中心, 江苏 镇江 212013)
Experimental study on performance of liquid jet gas pump by utilizing wallattached fluidic oscillator
 XIANG  Qing-Jiang, YUN  Qiang-Long, LI  Hong, WU  Yan-Lan
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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摘要 提出一种新的射流工作形式应用于液气射流泵,该射流形式——附壁振荡射流由射流元件产生.在液气射流泵垂直安装的试验装置上,对24种不同尺寸模型泵进行了振荡射流性能试验,并与直射情况对比.试验结果表明,工作水压力对性能影响明显,泵的性能线具有相近的最大压力比h值,随工作水压力的增大,最大流量比q和泵效率η增大.在相同工作压力下,随面积比m的增大,性能线由陡峭变为平缓,也即最大压力比减小,最大流量比增大,此时泵效率增大后减小,因此存在最优m值使效率最高.与直射情况对比,振荡射流形式获得的最大效率约为16%,小于直射情况,但两者具有相近的吸气量,采用振荡射流方式具有增大面积比的作用,随射流振荡频率的增大,压力比增大但小于直射情况.在给定具体工作压力为300 kPa情况下,由试验数据拟合出非稳定液气射流泵性能方程式,用于指导液气射流泵的实际应用.
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向清江
恽强龙
李红
吴燕兰
关键词液气射流泵   振荡射流   性能试验   射流元件   射流曝气     
Abstract: A new kind of jet, which is a wallattached oscillating jet produced by a fluidic element, was put forward and is going to be used in a liquid jet gas pump (LJGP). The liquid jet gas pump was vertically installed on a testrig, and then the performance of twentyfour test models with various dimensions was measured and compared with that of the pump with an ordinary straight jet. The results showed that the driving pressure has a significant influence on the performance, but the performance curves exhibit a similar peak pressure ratio h, the maximum flow ratio q and the pump best efficiency η increase with increasing driving pressure. At the same working pressure, the performance curves get more flat as the area ratio of throat to nozzle m is increased, namely, the peak h decreases and the maximum q increases, and the efficiency η gets a maximum at some value of m. This indicates that there is an optimum area ratio m at which the pump has the best efficiency. The best efficiency of a gas pump with an oscillating liquid jet was about 16%, less than that with a normal straight jet, but the two pumps have an approximate gas flow rate suctioned. Note that an oscillating jet needs a larger area ratio m, moreover as the oscillating frequency is increased, the pressure ratio h is improved but still less than the straight jet. At the given working pressure of 300 kPa, an empirical equation for the unsteady performance curve of a LJGP was proposed by best fitting experimental data. The equation might be used to guide the practical application for such a pump.
Key wordsliquid jet gas pump   oscillating jet   performance experiment   fluidic element   jet aeration   
收稿日期: 2012-04-10; 出版日期: 2012-11-30
基金资助:

国家自然科学基金资助项目(50906034); 江苏大学高级专业人才科研启动基金资助项目(09JDG049)

通讯作者: 向清江(1974—),男,湖北宜都人,助理研究员,博士后(xiang_qj@163.com),主要从事流体机械及工程、射流技术研究.   
作者简介: 恽强龙(1986—),男,江苏江阴人,硕士研究生(yql01985@163.com),主要从事喷射技术及应用、液气射流泵研究.
引用本文:   
向清江,恽强龙,李红等. 附壁振荡液气射流泵工作性能试验研究[J]. 排灌机械工程学报, 2012, 30(6): 650-654.
XIANG Qing-Jiang,YUN Qiang-Long,LI Hong et al. Experimental study on performance of liquid jet gas pump by utilizing wallattached fluidic oscillator[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(6): 650-654.
 
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