Study of Flow Instability in a Miniature Centrifugal Pump Based on Energy Gradient Method
作者: K. LiX. ChenH. S. DouZ. ZhuL. zhengX. Luo
刊名: Journal of Applied Fluid Mechanics, 2019, Vol.12 (3), pp.701-713
来源数据库: Directory of Open Access Journals
关键词: Miniature centrifugal pumpEnergy gradient methodFlow instabilityTotal mechanical energy.
原始语种摘要: Flow instability in a miniature centrifugal pump is numerically simulated with the RANS equations and the SST k-ω turbulence model. The energy gradient method is adopted to analyze the flow instability at design load and two off-design loads, and the results are compared with those analyzed by Q-criterion. The regions with large magnitude of energy gradient function (K) indicate pronounced turbulent intensity and poor flow stability. Internal flow stability is investigated in details for both the near blade surfaces region and the impeller passages. To study the mechanism of energy gradient method, internal flow parameters such as the velocity and total pressure, the transverse gradient of total mechanical energy and the work done by shear stresses are investigated respectively. The...
全文获取路径: DOAJ  (合作)

  • gradient 倾斜度
  • impeller 叶轮
  • energy 能量
  • centrifugal 离心的
  • concentrated 集中的
  • mechanical 机械的
  • large 大的
  • total 总和
  • analyze 分析
  • stability 稳定性