0
Research Papers

Numerical Investigations of the Coupled Flow Through a Subsonic Compressor Rotor and Axial Skewed Slot

[+] Author and Article Information
Xingen Lu

School of Power and Energy, Northwestern Polytechnical University, Xi’an, 710072, P.R.C.xingenlu@hotmail.com

Wuli Chu, Yangfeng Zhang

School of Power and Energy, Northwestern Polytechnical University, Xi’an, 710072, P.R.C.

Junqiang Zhu

 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 10080, P.R.C.

J. Turbomach 131(1), 011001 (Sep 25, 2008) (8 pages) doi:10.1115/1.2948959 History: Received June 14, 2005; Revised November 16, 2006; Published September 25, 2008

In order to advance the understanding of the fundamental mechanisms of axial skewed slot casing treatment and their effects on the subsonic axial-flow compressor flow field, the coupled unsteady flow through a subsonic compressor rotor and the axial skewed slot was simulated with a state-of-the-art multiblock flow solver. The computational results were first compared with available measured data, that showed the numerical procedure calculates the overall effect of the axial skewed slot correctly. Then, the numerically obtained flow fields were interrogated to identify the physical mechanism responsible for improvement in stall margin of a modern subsonic axial-flow compressor rotor due to the discrete skewed slots. It was found that the axial skewed slot casing treatment can increase the stall margin of subsonic compressor by repositioning of the tip clearance flow trajectory further toward the trailing of the blade passage and retarding the movement of the incoming∕tip clearance flow interface toward the rotor leading edge plane.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Tested axial skewed slots casing treatment configuration

Grahic Jump Location
Figure 2

Blade-to-blade view of grids on the rotor-casing treatment sliding interface

Grahic Jump Location
Figure 3

Unsteady pressure signal in a representative slot and its Fourier transformation

Grahic Jump Location
Figure 4

Computed and measured compressor map for 71% design speed: (a) total-to-static pressure ratio; (b) isentropic efficiency

Grahic Jump Location
Figure 5

Comparison of predicted and experimental radial isentropic efficiency for the rotor with and without axial skewed slot casing treatment

Grahic Jump Location
Figure 6

The distribution of circumferentially averaged total pressure loss coefficient at smooth wall stall mass flow: (a) smooth wall; (b) axial skewed slot

Grahic Jump Location
Figure 7

Comparison of relative Mach number at 99% blade span at smooth wall stall mass flow: (a) smooth wall; (b) axial skewed slot

Grahic Jump Location
Figure 8

Computed tip clearance vortex particle traces at smooth wall stall mass flow rate: (a) smooth wall; (b) axial skewed slot

Grahic Jump Location
Figure 9

Comparison of predicted near rotor tip blade loading

Grahic Jump Location
Figure 10

Predicted treatment slot velocity vector patterns for different instants during one blade passing period: (a) t=T∕4, (b) t=2T∕4, (c) t=3T∕4, and (d) t=4T∕4

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