0
Research Papers: Gas Turbines: Turbomachinery

Experimental Study on the Cavitation Characteristics of an Oil Jet Pump With Multiple Nozzles for the Lubrication System in a Steam Turbine

[+] Author and Article Information
Jun Zhang

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zhangjundoctor@gmail.com

Jing-ru Mao

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zj5617353@126.com

Shun-sen Wang

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: jr_mao@126.com

Bin Wu

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 928234418@qq.com

Hao Yuan

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 980399877@qq.com

Kai-ge Wang

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: wkg2007hero@126.com

Jun-jie Zhang

Shenhua Guohua (Beijing) Electric Power
Research Institute Co., Ltd.,
Beijing 100025, China
e-mail: lonewolfchina@sina.com

Peng Sun

Shenhua Guohua (Beijing) Electric Power
Research Institute Co., Ltd.,
Beijing 100025, China
e-mail: 15991765378@163.com

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 25, 2014; final manuscript received June 8, 2014; published online July 2, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(12), 122605 (Jul 02, 2014) (10 pages) Paper No: GTP-14-1246; doi: 10.1115/1.4027832 History: Received May 25, 2014; Revised June 08, 2014

Cavitation characteristics of oil jet pumps with multiple nozzles were studied using high frequency response pressure transducers with Mobile DTE Light Oil in experiment, which has an environment the same as that in the lubrication system of the steam turbine in a power plant. The influence of working oil pressure, pressure ratio, and area ratio on cavitation characteristics were studied with the area ratio ranging from 4 to 9, and the working oil pressure ranging from 1.8 to 2.8 MPa. Results show that the cavitation erosion on the throat surface is caused by the intense shear layer of high-speed jet in the throat, which leads to the collapse of vortex cavitation bubbles near the throat surface in an oil jet pump with multiple nozzles. What is more, the vortex cavitation is difficult to eradicate in an oil jet pump with multiple nozzles for the lubrication system of a steam turbine. However, there is a working point with low cavitation intensity, which is also the high efficiency point that ensures both relative safety and high efficiency. This study provides quantitative relation for the determination of working oil pressure, area ratio, and pressure ratio of an oil jet pump with multiple nozzles, which is significant for engineering.

Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Cavitation erosion on the throat surface of an oil jet pump with multiple nozzles

Grahic Jump Location
Fig. 2

The relevant problems arise from cavitation in an oil jet pump with multiple nozzles: (a) wear of bearing bush and (b) crack of outflow pipe

Grahic Jump Location
Fig. 3

Schematic of experimental rig

Grahic Jump Location
Fig. 10

Schematic of pressure impulses filtered by a threshold

Grahic Jump Location
Fig. 11

Influence of pressure threshold on the cavitation intensity of three points (m = 7.47, P0 = 2.4 MPa): (a) threshold = 0.1 MPa, (b) threshold = 0.2 MPa, (c) threshold = 0.25 MPa, and (d) threshold = 0.3 MPa

Grahic Jump Location
Fig. 9

Raw signals of piezoelectric pressure transducers at point PC under two pressure ratios (m = 7.47, P0 = 2.4 MPa)

Grahic Jump Location
Fig. 8

Comparison of pressure distribution from simulation results of Realize k-ε turbulence model with experimental data (m = 7.47, P0 = 2.4 MPa)

Grahic Jump Location
Fig. 7

Comparison of entrainment ratio and efficiency from simulation results with experimental data (m = 7.47, P0 = 2.4 MPa): (a) entrainment ratio and (b) efficiency

Grahic Jump Location
Fig. 6

Calculation domain and grids of oil jet pump with multiple nozzles

Grahic Jump Location
Fig. 5

Arrangement of piezoelectric pressure transducers and pressure transmitters

Grahic Jump Location
Fig. 4

Schematic of oil jet pump with multiple nozzles

Grahic Jump Location
Fig. 12

Cavitation characteristics versus the pressure ratio at point PC (m = 7.47, P0 = 2.4 MPa)

Grahic Jump Location
Fig. 13

Pressure peak and corresponding peak duration change with the pressure ratio in three stages: (a) stage 1, (b) stage 2, and (c) stage 3

Grahic Jump Location
Fig. 14

Distribution of vorticity and vapor volume change with the pressure ratio in stage 1: (a) vorticity and (b) vapor volume fraction

Grahic Jump Location
Fig. 18

The pressure ratio of the local minimum cavitation intensity point versus the area ratio

Grahic Jump Location
Fig. 19

The local minimum cavitation intensity versus the working oil pressure with different area ratios

Grahic Jump Location
Fig. 20

Exponential coefficient versus the area ratio

Grahic Jump Location
Fig. 15

Distribution of vapor volume fraction changes with the pressure ratio in stage 2

Grahic Jump Location
Fig. 16

The pressure ratio of the local minimum cavitation intensity point versus the working oil pressure (m = 7.47)

Grahic Jump Location
Fig. 17

The local minimum cavitation intensity versus the working oil pressure (m = 7.47)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In