Effects of Flow Rate on Turbulent Flow Characteristics at Mid-Passage of an Unshrouded Centrifugal Impeller.

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  • 半開放形遠心羽根車の通路中間乱流特性に及ぼす流量の影響
  • ハンカイホウケイ エンシン ハネグルマ ノ ツウロ チュウカン ランリュウ トクセイ ニ オヨボス リュウリョウ ノ エイキョウ

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Abstract

The relative and turbulent flows were measured at the mid-passage of an unshrouded centrifugal inpeller. The measurements using a hot-wire anemometer were made for a flow rate corresponding to nearly zero incidence angle and two other flows with reduced and increased flow rates. A low relative velocity, a high dissipation and a high Reynolds stress appear around the region of the middle blade-to-blade to the casing side due to both influences of a blade tip leakage and a secondary flow. As the flow rate is reduced, this region enlarges by nearing the hub and also tends to move toward the suction. In the increased flow rate, the Reynolds stress is remarkably high near the casing of the suction side since the tip leakage noticeably influences there. In the reduced flow rate, the stress becomes high also on the suction because of the secondary flow strengthened near the casing. For three flow rates, however, the dissipation is remarkably high near the casing of the suction side; the influence of the flow rate on the position with the highest dissipation seems to be little.

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