摘要
为深入研究新型高效S形轴伸贯流泵装置流道内部流动特性,采用CFD技术对该泵装置进行了全流道三维定常流动计算,获得了在大流量、小流量和最优工况时泵装置的内部流场。结果表明:在叶片安放角0°的最优工况(泵装置计算最高效率为81%,试验最高效率82.57%,流量系数KQ=0.492,扬程系数KQ=0.830)时进水流道的速度加权平均角为88.8°,轴向速度分布均匀度达到97.51%,水力损失为3.89cm;泵装置流道效率达到98.5%。运行工况范围内,出水流道出口断面的最大速度为1.429 m/s,满足国家标准(GB50265-2010)的要求;在大流量工况时,出水流道的弯管段上侧出现了小范围的漩涡。与该泵装置物理模型试验结果比较可知,数值预测泵装置性能与试验的性能数据符合较好,该泵装置匀顺的整体流动形态使能量损失很小,泵装置性能优异。
To further study the internal flow characteristics of high-efficiency S-shape shaft extension tubular pump system, three-dimensional steady flows in a pump system were simulated by CFD and the internal flow patterns at large and small flows and optimum operating conditions were obtained. For an optimal pump system that has a blade angle 0°, a flow coefficient KQ=0.492, and a head coefficient KH=0.830, its highest efficieneies of 82.57% and 81.00% were measured and calculated respectively. In the inlet passage, axial velocity distribution uniformity is 97.51%, and velocity-weighted average angle 88.8°, with a hydraulic loss of 3.89cm. At the optimum operating condition the calculation of pipe efficiency is up to 98.50%, in the range of normal operation the maximum velocity of 1.429 m/s meets the requirement of National standard （GB50265-2010）, and under large flow rate vortices appeared in a small top region of the discharge elbow. The predictions of performances were compared with measurements, and it is found that both agree well. The overall flow pattern of this optimal pump system is uniform and smooth and the hydraulic loss is very small, indicating its superior hydraulic performances.
出处
《水力发电学报》
EI
CSCD
北大核心
2014年第5期198-203,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(51279173)
江苏省产学研前瞻性联合研究资助项目(BY2009138)
关键词
水力机械
贯流泵
高效
泵装置
内部流动
数值模拟
hydraulic machinery
tubular pump
high efficiency
pump system
internal flow
numericalsimulation
