EXPERIMENTAL INVESTIGATION OF THE NON-UNIFORM INFLOW GENERATED BY THE SYMMETRICAL SUCTION ELBOW OF A LARGE PUMP

摘要

This paper aims to experimentally investigate the non-uniform velocity field on the suction elbow outlet of the large pumps. The suction elbow has a three-dimensional symmetrical shape that induces non-uniform hydrodynamic field at the impeller inlet. The velocity field is measured using LDV system in order to be quantified the non-uniformities generated at the impeller inlet. A large variation of the circumferential velocity component induces a significant modification of the absolute angle flow in front of the impeller over each full rotation. Therefore, strong unwanted effects are generated in the impeller. The conclusions are drawn in the last section.