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Hitachi

Hitachi Industrial Products, Ltd.Pump system

We build optimal systems for pump equipment using a range of simulation technologies.

Suction sump flow simulation

We calculate the generation of air entraining vortices and submerged vortices using turbulence analysis and our own original algorithms. We strongly support the reqvirenlat for more compact water suction sump designs.

Air entraining vortex:
Swirling currents produced from a free surface (water's surface) to the inlet of the suction pump from fast moving air induced by the suction of the pump
Submerged vortex:
Swirling current pressures produced from the bottom and the sides of the suction sump that fall below vapor pressure induced by the suction of the pump

Image: Underwater vortex and air suction vortex phenomena in the pump suction sump
Underwater vortex and air suction vortex phenomena in the pump suction sump

Summary of the analysis

  • We evaluate the conditions for the water channel, receiving tank, and pump suction sump using flow analysis.
  • We use analysis results and evaluate the pump suction sump conditions to investigate the presence of harmful vortices.
  • When harmful vortices are generated, we propose appropriate countermeasures.

Comparison between test and analysis results

We always compare the analysis results with the test results, and thoroughly check that the analysis results can be used in the investigation.

Image: Air suction inlet
Air suction inlet

Image: Submerged vortex
Submerged vortex

Image: Graph of the stages of submerged underwater vortex creation
Graph of the stages of submerged vortex creation

Main applications

  • Pump equipment for the water suction tank