遠心ポンプの極低流量における気泡が関与した自励振動 (<小特集>タ-ボ機械の内部流れと定常・否定常特性)

概要

論文の詳細を見る
In the very low discharge range of a semi-open-type centrifugal impeller, severe self-sustained oscillations were induced when a few percent of air was introduced at the upstream of impeller. In order to elucidate the mechanism of this oscillation, instantaneous measurements of blade-to-blade pressure distribution were performed and a linear stability analysis of gas-liquid flow in the pumping system was carried out. The theoretical results revealed that the present dynamic instability is caused by the unbalance between the pump-head drop rate due to the system resistance and bubble accumulation in the impeller channel which is largely influenced by the size and the behavior of the bubble zone. The measured results revealed that the bubble accumulation zone causes the recirculating flow at an impeller inlet to disappear and then induces a sudden strong reverse flow with strongly swirling bubble flow.
1995-11-25