摘要
采用雷诺时均N-S方程和标准k-ε湍流模型,应用三维非结构四面体网格建模,选用旋转流体机械模型中的多重参考坐标系模型(MRF),对设计工况下旋流自吸泵叶轮和蜗壳耦合的三维不可压缩湍流流场进行了数值模拟,得到了其内部流场的压力分布和速度分布情况.对叶轮内部的相对速度流场和压力场进行了细致的分析,证实了叶轮和蜗壳由于相对位置不同,相互作用而引起的叶轮内部流场具有一定的非对称性.对蜗壳速度流场进行了分析,得到了蜗壳内靠近叶轮出口处的速度值较大的结论,并指出,由于蜗壳结构复杂而导致的内部流动紊乱,会造成一定的损失.另外,还对导壁附近区域和分离室内流场进行了深入研究,揭示了导壁附近区域和分离室内存在旋涡这一现象,并对旋涡形成的原因进行了分析和探讨.
The three-dimensional incompressible turbulent flow of coupled impeller and volute was simulated by using reynolds time-averaged N - S equations, the standard k - 8 turbulent model, three-dimen- sional non-structural tetrahedral mesh and multiple reference frame of rotating fluid mechanical model. The velocity and pressure distributions in the volute and impeller were obtained. The relative velocity and pressure distributions in the impeller interior were analyzed in detail. It was proved that the interior flow field of impeller is nonsymmetrical due to the interaction of impeller and volute in different relative position. The velocity in the volute nearby the impeller outlet was higher. It was found that the interior flow in the volute was turbulent due to its complicated structure, and can result in some loss. In addition. It was revealed that those vortexes exist nearby the clapboard and in the separation chamber. The reason was analyzed and discussed.
出处
《排灌机械》
2008年第2期31-35,共5页
Drainage and Irrigation Machinery
基金
国家自然科学基金资助项目(50776040)
关键词
旋流自吸泵
数值模拟
多重参考坐标系
湍流
流场
rotational flow self-priming pump
numerical simulation
multiple reference frame
turbulentflow
flow field
