摘要
利用三维湍流数值模拟方法分析比较了两种流道在带泵与不带泵情况下进水流道的出口流场情况以及流道水力损失情况。研究结果表明,两流道在各工况下,内部流态良好,无漩涡或脱流。水流在到达两流道出口断面时速度均匀度已经比较理想分别达到94.40%和94.58%,速度加权平均角分别达到89.9°和89.9°。泵装置的计算结果表明叶轮旋转对水流流速均匀度的影响较为明显,而对水流速度加权平均角的影响微小。水泵叶轮旋转对进水流道的水力性能会有一定的影响,泵装置水力特性并不是泵水力特性和流道水力特性的迭加。在大流量工况区流道形式1的水力性能稳定性要稍优于流道形式2。
The internal flow and hydraulic performance of the two inlet ducts with and without pumps under different mass flow working conditions were analyzed by applying 3-D turbulent numerical simulation .The result showed that the streamline was good with no vortices of the two ducts under different working conditions .The uniformity of axial velocity distri-bution was as high as 94 .40% and 94 .58% of the two ducts respectively ,and the axial velocity angle reached 89 .9° and 89 .9° separately .The results of the pump sets indicate that the rotating impellers of the pumps have a little impact on the flow axial angle ,but a great impact on the uniformity of axial velocity distribution .The rotating impellers also affect the hydraulic performance of the ducts ,so the hydraulic performance of the pump is not just the superposition of the pumps ’ and the ducts’ hydraulic performance .The hydraulic performance of duct 1 is slightly better than that of duct 2 when they are under large mass flow rate .
出处
《水利与建筑工程学报》
2014年第4期191-195,203,共6页
Journal of Water Resources and Architectural Engineering
关键词
簸箕流道
进水流道
数值模拟
泵装置
水力特性
dustpan inlet
suction box
numerical simulation
pump set
hydraulic performance
