Performances and Rotating Flows of Rotary Jet Pump

Keiichi Komaki,Kenji Sagara,Toshiaki Kanemoto

doi:10.4236/ojfd.2012.24a048

Abstract

The rotary jet pumps, namely the pitot pumps, are composed of the rotating casing with the impeller channels and the stationary pick-up tube for discharging, are known as the one of high pressure pumps in the U.S. market. The pumps, however, have been prepared experientially, because of poor knowledge for the flow conditions and the pump performances. Then, this paper discusses the pump performances and the internal flow conditions in the rotating casing. Three types of the pick-up tube were prepared for the experiments to know the pump performances and the flow conditions in the rotating casing. The flow in the rotating casing is nearly in the forced vortex type and gives the higher pressure at the pick-up tube inlet. The more cross-sectional area of the pick-up tube channel is large, the more head and discharge are higher with excellent efficiency. Moreover, the authors confirmed that the secondary flow runs toward the rotating center at the wake flow region behind the pick-up tube.

Highlights

It is compelling social problems, for developing countries with population growths and economic growths to save energy
Three types of the pick-up tube were prepared for the experiments to know the pump performances and the flow conditions in the rotating casing
The more cross-sectional area of the pick-up tube channel is large, the more head and discharge are higher with excellent efficiency

Summary

Introduction

It is compelling social problems, for developing countries with population growths and economic growths to save energy. The turbo pumps are demanded for pump performance improvement and/or energy saving. RJ pump has serious problems to get the head and discharge with the higher efficiency, contrary to have many advantages such as few parts and easy maintenance. The relation between the pump performances and the internal flow conditions has been out of the investigations. On such poor technologies, this paper experimentally investigated and discussed the pump performances and the flow conditions in the rotating casing, as the preparation to get higher head and the higher discharge with the higher efficiency

Model Pump

Experimental Setup

Model Pick-Up Tube

Measurement of the Pressure on the Rotating Wall

Pump Performances

Internal Flow