Redesign of a high-speed pump

The research article 'Failure and redesign of a high-speed pump with respect to rotor-stator interaction' has been published in Elsevier journal Engineering Failure Analysis (Volume 104, October 2019, Pages 704-713).

Abstract

Pumps with high speed have multiple advantages compared to those with relatively low speed. One of these advantages is reduced size and weight. This makes the pump easier to handle and, in most cases, less costly. Another advantage can be increased efficiency especially for low-flow and high-head pumps. There are also challenges such as the rotor-stator interaction (RSI) and structural dynamics of the impeller which may increase with high speed.

This article focus is on a case were the pump impeller experienced cracks at the impeller outlet due to rotor-stator interaction. This pump was re-designed to lower the dynamic loads and stresses without altering the hydraulic performance. Transient CFD simulations were performed to capture the pressure dynamics from the impeller-diffusor interaction. This was used as input to the stress analysis, which was a harmonic response analysis with the structure fully coupled to water capturing the water added mass. A test rig was built to verify the calculated head-capacity curve at of-design operation. In this rig the pump unit were 3D printed both with original and modified design.

Access the complete article on ScienceDirect.