摘要
针对导叶安放位置对蜗壳水力损失影响的问题,对不同导叶安放位置下离心泵水动力特性进行了数值分析,并加以试验验证。首先,选取了5组不同的导叶安放位置,并开展了外特性试验以验证数值模拟结果的准确性;其次,基于数值模拟结果,分析了导叶安放位置对过流部件总压降变化的影响规律;然后,采用回转面展开的方式,研究了不同导叶位置下蜗壳进口来流条件变化,分析了导叶位置对蜗壳来流的影响;最后,分析蜗壳流道由进口至出口的总压变化规律,结合流场分布分析了导叶位置对蜗壳水力损失影响规律。研究结果表明:不同导叶位置下离心泵扬程和效率最大差异分别约为4.8%和3.5%;受蜗壳出口段漩涡影响严重,蜗壳水力损失变化明显高于其他部件;在θd 4位置时,出口段漩涡影响最小,蜗壳水力损失显著下降;隔舌位于导叶流道中间位置时,蜗壳来流均匀,蜗壳水力损失显著下降,泵性能更优。
In order to investigate the influence of guide vane placement on the hydraulic loss of the volute casing,a numerical analysis was conducted to study the hydrodynamic characteristics of the centrifugal pump under different guide vane placements,which was further verified through experimental tests.Firstly,five sets of different guide vane placements were selected,and external characteristic tests were carried out to validate the accuracy of the numerical simulation results.Secondly,based on the numerical simulation results,the impact of guide vane placement on the total pressure drop variation across the flow parts was analyzed and studied.Then,by unfolding the rotating surface,the changes in flow conditions at the volute casing inlet under different guide vane placements were investigated,and the influence of guide vane placement on the incoming flow to the volute casing was analyzed.Finally,the overall pressure variation in the volute casing from the inlet to the outlet was analyzed,and the influence of guide vane placement on the hydraulic loss of the volute casing was studied in combination with the flow field distribution analysis.The research results show that the maximum differences in head and efficiency of the centrifugal pump under different guide vane placements are approximately 4.8%and 3.5%,respectively.Due to the significant influence of vortex at the outlet section of the volute casing,the hydraulic loss of the volute casing varies significantly compared to other components.When the guide vanes are placed at theθd 4 position,the influence of the vortex at the outlet section is minimized,and the hydraulic loss of the volute casing decreases significantly.When the tongue is positioned between the guide vane blades,the incoming flow for volute becomes uniform and the hydraulic loss decreases significantly.
作者
刘振
刘吉营
江伟
朱相源
LIU Zhen;LIU Jiying;JIANG Wei;ZHU Xiangyuan(Suzhou Architectural Decoration D&R Institute Co.,Ltd.,Suzhou 215000;School of Thermol Engineering,Shandong Jianzhu University,Jinan 250000;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100)
出处
《机电工程》
CAS
北大核心
2024年第3期520-531,550,共13页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51809218)
山东省自然科学基金资助项目(ZR2021QE258)。
关键词
离心泵
蜗壳
导叶安放位置
水动力特性
水力损失
数值模拟
centrifugal pump
volute
vane position
hydrodynamic characteristics
hydraulic loss
numerical simulations
