流体机械
流體機械
류체궤계
FLUID MACHINERY
2013年
12期
43-47,5
,共6页
低比数离心泵%驼峰现象%CFD%水力损失
低比數離心泵%駝峰現象%CFD%水力損失
저비수리심빙%타봉현상%CFD%수력손실
low specific speed centrifugal pump%hump phenomenon%computational fluid dynamics%hydraulic losses
为揭示低比转数离心泵性能曲线产生驼峰现象的内流机理，采用RANS方法算法对一低比转数离心泵2个方案（有驼峰和无驼峰）下的内部进行了全流场CFD计算，重点分析了驼峰现象产生时2个方案内部流动结构的差异。结果表明：性能曲线出现驼峰时，2个方案的靠近蜗壳隔舌的叶轮流道内的流动结构差异最为明显；该流道内叶片压力面的低速区会明显增大并伴有漩涡流动；该流道进口也会出现明显的漩涡流动引起进口冲击损失增加；同时该流道出口的“射流-尾迹”现象也会突变，引起出口（混合）水力损失增加。因此这些损失的增大是引起驼峰现象的重要原因。
為揭示低比轉數離心泵性能麯線產生駝峰現象的內流機理，採用RANS方法算法對一低比轉數離心泵2箇方案（有駝峰和無駝峰）下的內部進行瞭全流場CFD計算，重點分析瞭駝峰現象產生時2箇方案內部流動結構的差異。結果錶明：性能麯線齣現駝峰時，2箇方案的靠近蝸殼隔舌的葉輪流道內的流動結構差異最為明顯；該流道內葉片壓力麵的低速區會明顯增大併伴有漩渦流動；該流道進口也會齣現明顯的漩渦流動引起進口遲擊損失增加；同時該流道齣口的“射流-尾跡”現象也會突變，引起齣口（混閤）水力損失增加。因此這些損失的增大是引起駝峰現象的重要原因。
위게시저비전수리심빙성능곡선산생타봉현상적내류궤리，채용RANS방법산법대일저비전수리심빙2개방안（유타봉화무타봉）하적내부진행료전류장CFD계산，중점분석료타봉현상산생시2개방안내부류동결구적차이。결과표명：성능곡선출현타봉시，2개방안적고근와각격설적협륜류도내적류동결구차이최위명현；해류도내협편압력면적저속구회명현증대병반유선와류동；해류도진구야회출현명현적선와류동인기진구충격손실증가；동시해류도출구적“사류-미적”현상야회돌변，인기출구（혼합）수력손실증가。인차저사손실적증대시인기타봉현상적중요원인。
In order to study the hump of pump performance curve in low specific speed centrifugal pumps ,using RANS method algorithm to CFD calculations of internal full flow of low specific speed centrifugal pump in two schemes ( has a hump and without the hump ) to calculate and analysis .Differences of the internal flow structure are emphatically analyzed in two schemes when hump phenomenon occurs .The results show that the performance curve appeared hump ,the flow structure differences of the impel-ler flow passage near the volute tongue in two programs are the most obvious .Low speed area in the pressure side of the impeller blade in the passage can significantly increase accompanied by vortex flow .The flow of imports also appear obvious vortex flow , losses increased by the impact of the vortex flow .Meanwhile,the "jet-wake"phenomenon of the channel outlet also mutate ,cau-sing exports hydraulic losses increase .Therefore,the increase of these losses is the significant cause of hump phenomenon .
