华中科技大学学报（自然科学版）Issue(10)：108-112,118,6.DOI:10.13245/j.hust.141022
进水均匀性对大型轴流泵装置空化特性的影响
Influence on cavitation characteristics of large axial-flow pumping unit by uniformity of conduit inflow
摘要
Abstract
Regarding to the effect on cavitation characteristics of large axial-flow pumping unit caused by the elbow-inlet conduit ,establishment of accurate prediction methods is necessary .In this paper , based on the velocity triangle theory ,the relationship of net positive suction head (NPSH) and uni-formity of inlet velocity was firstly deduced .And then computational fluid dynamics (CFD) technolo-gy was used to simulate external characteristic curve of large axial-flow pumps and the results of ex-periment and simulation were compared .In conclusion ,the research shows that under the optimal conditions ,the head error is 3 .58% w hile the efficiency error is 3 .31% ,w hich indicates the correct-ness of numerical simulation .What’s more ,properties and cavitation characteristics of pumping unit were predicted ,and uniformity of inlet velocity got bad due to the influence of elbow-inlet flow ,which lead to 7 .83% reduction of head and 12 .04% increment of NPSH .By comparing uniformity of inlet velocity ,it can be find that at impeller inlet section ,the inlet flow dose not enter into inside impeller vertically and uniformly ,but at an angle with axial streamline ,and weight average angle of inflow ve-locity (θ) become maximum when cavitation occurred .Actually ,putting θinto formula ,the NPSH error of both axial flow pump model and pumping unit are reduced to less than 5% ,w hich meets the requirements of engineering application .关键词
大型轴流泵装置/肘形进水流道/空化/理论分析/数值模拟/进口速度均匀性Key words
large axial-flow pumping unit/elbow-inlet conduit/cavitation/theoretical analysis/nu-merical simulation/uniformity of inlet velocity分类
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燕浩,刘梅清,梁兴,林鹏..进水均匀性对大型轴流泵装置空化特性的影响[J].华中科技大学学报（自然科学版）,2014,(10):108-112,118,6.基金项目
国家自然科学基金资助项目（50879062）；湖北省水利重点科研资助项目（HBSLKJ201307）． （）
