Reverse Flow, Pre-Rotation and Unsteady Inlet Flow in Centrifugal Pumps

摘要

The inlet flow field at partial deliveries in centrifugal pumps was studied. Pump design parameters which influence the reverse flow were investigated. To determine the governing parameters of the reverse flow, several impellers were designed, and details of flow conditions were examined in the suction pipe to determine the governing parameters of the reverse flow. It is shown that the principal factor affecting reverse flow is aerodynamic blade loading. Yaw angle measurements were done in the suction pipe to study the unsteady inlet flow.