摘要
为研究偏工况下不同叶轮外径D2(101,103,105 mm)对双流道污水泵内压力脉动的影响,采用Mixture多相流模型对泵内固液两相流进行了非定常数值计算,并进行了试验验证.偏工况主要包括了小流量工况0.6Qd和大流量工况1.2Qd.结果表明,在小流量工况下,蜗壳周向压力脉动总体上均随D2增大而增大,且叶轮外径从103 mm增大到105 mm时压力脉动最大增幅达到53.2%;而在大流量工况时,除VP3,VP6和VP7点外,其余各点处蜗壳周向压力脉动均随D2增大而小幅增大.在2种流量工况下,蜗壳周向压力脉动均随角度变化剧烈震荡,同时,偏工况下较小的叶轮外径有利于减小泵内压力脉动.在固液两相流工况下,当D2为105 mm时隔舌附近各点瞬时静压值波动都很剧烈,各点压力脉动主频在0.6Qd下以低频为主,而在1.2Qd下则均是叶频,且在该工况下各点压力脉动最大幅值均随D2增大而增大.研究结果可为双流道污水泵的优化设计提供依据.
In order to analyze the influence of D2 （101, 103 and 105 mm）on pressure pulsation under partial conditions, the unsteady solid - liquid two-phase flow of the double-channel sewage pump was numerically simulated by using the Mixture muhiphase flow model, and the results were verified per- fectly by experiments. The partial condition mainly includes small flow rate of 0. 6Qd and large flow rate of 1.2Qd. The results show that the pressure pulsation of volute circumference under 0.6Qd generally increase with the increasing of D2, and the maximum increase reaches 53.2% when the impeller dia- meter increases from 103 mm to 105 ram, while except points VP3, VP6 and VPT, the pressure pulsa- tion of volute circumference under 1.2Qd increase slightly with the increasing of D2. The pressure pul- sation of volute circumference varies severely with angle change under 0.6Qd and 1.2Qd. The smaller impeller diameter is contributed to reduce the pressure pulsation in the pump under 0.6Qd and 1.2Qd.Instantaneous static pressure of each monitoring point around the tongue in all solid - liquid two-phase flow conditions fluctuates sharply when D2 is 105 ram. For each monitoring point near the tongue under the solid - liquid two-phase flow, the dominant frequency of pressure pulsation under 0. 6Qd is of the low frequency, while the dominant frequency under 1.2Qd is of the blade passing frequency, the pressure pulsa- tion maximum amplitude of these points basically increase with the inc, reasing of D, under 1.2Qd. The re- sults provide the basis for the optimization design of double-channel sewage pump.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2016年第4期301-306,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
"十二五"国家科技支撑计划项目(2013BAK06B02)
国家自然科学基金资助项目(51179075)
江苏高校优势学科建设工程资助项目
江苏大学研究生创新工程项目(KYXX_0039)
关键词
双流道污水泵
偏工况
叶轮外径
压力脉动
固液两相流
叶频
double-channel sewage pump
partial condition
impeller diameter
pressure pulsation
solid -liquid two-phase flow
blade passing frequeney
作者简介
丁荣（1989一），男，湖南鼎城人，硕士研究生（davidjacson@163．com），主要从事水力机械多相流研究．
谈明高（1980一），男，江苏扬州人，副研究员，博士（通信作者，tmgwxf@ujs．edu．cn），主要从事泵现代设计理论与方法研究．
