工业用减阻剂对射流泵性能影响的试验研究

Experimental study on effect of industrial drag reducing agent on performance of jet pump

为探究减阻剂对射流泵性能的影响,进行了添加聚氧化乙烯(PEO)与阳离子聚丙烯酰胺(CPAM)2种减阻剂对射流泵性能影响的试验研究.结果表明:减阻剂的质量分数对射流泵性能的变化有决定性的作用,质量分数为(0,0.10‰]时,2种减阻剂对射流泵性能无明显影响;质量分数为(0.10‰,0.25‰]时,部分工况的射流泵性能甚至出现下降;随着质量分数提高,射流泵性能均有一定的提升,质量分数为1.00‰~1.25‰时,射流泵性能提升达到最大,效率最大可提高6.15%;质量分数进一步提高,射流泵性能提升的幅度有所下降;相同质量分数下PEO提升射流泵性能的效果要优于CPAM;减阻剂对2个不同面积比的射流泵性能在大流量工况下提升效果更为明显,但在极限工况时,剧烈空化影响了减阻剂的效果,导致提升幅度有限;PEO在面积比1.78的射流泵中的减阻效果强于在面积比4.00的射流泵中的减阻效果,而CPAM在面积比1.78的射流泵中的减阻效果弱于在面积比4.00的射流泵中的减阻效果.

To examine the impact of drag reducing agents on the performance of jet pumps,an experimental study on the effect of adding polyethylene oxide(PEO)and cation-polyacrylamide(CPAM)drag reducing agents on the performance of jet pump was carried out.The results show that the concentration of drag reducing agent has a decisive effect on the performance of the jet pump,and the two kinds of drag reducing agents have no obvious effect on the performance of the jet pump at the concentration of 0-0.10‰.The performance of jet pump even decreases under some conditions of 0.10‰-0.25‰concentration.With the further improvement of the concentration,the performance of the jet pump has been improved to a certain extent.When the concentration is around 1.00‰-1.25‰,the performance of the jet pump has been improved to the maximum,and the efficiency can be increased by 6.15%at the maximum.If the concentration is further increased,the range of performance improvement of jet pump will decrease.At the same concentration,PEO can improve the performance of jet pump better than CPAM.The research of the jet pump with two area ratios shows that the lifting effect is more obvious under the condition of large flow ratio,but under the limit condition,the effect of drag reducing agent is affected by severe cavitation,resulting in limited lifting range.The drag reduction effect of PEO in jet pumps with an area ratio of 1.78 is stronger than that in jet pumps with an area ratio of 4.00,while the drag reduction effect of CPAM in jet pumps with an area ratio of 1.78 is weaker than that in jet pumps with an area ratio of 4.00.