0
research-article

EFFECTS OF AREA RATIO AND MEAN RISE ANGLE ON THE AERODYNAMICS OF INTER-TURBINE DUCTS

[+] Author and Article Information
Yanfeng Zhang

National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
zhangyf@iet.cn

Shuzhen Hu

National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
shuzhen_hu@hotmail.com

Ali Mahallati

National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
alimahallati@yahoo.ca

Xue Feng Zhang

National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
xue.zhang@ge.com

Edwards Vlasic

Pratt & Whitney Canada, 1000 Boulevard Marie-Victorin, Longueuil, QC, J4G 1A1, Canada
Ed.Vlasic@pwc.ca

1Corresponding author.

ASME doi:10.1115/1.4039936 History: Received July 04, 2016; Revised December 17, 2017

Abstract

The present work, a continuation of a series of investigations on the aerodynamics of aggressive inter-turbine ducts (ITD), is aimed at providing detailed understanding of the flow physics and loss mechanisms in four different ITD geometries. A systematic experimental and computational study was carried out by varying duct outlet-to-inlet area ratios and mean rise angles while keeping the duct length-to-inlet height ratio, Reynolds number and inlet swirl constant in all four geometries. The flow structures within the ITDs were found to be dominated by the boundary layer separation and counter-rotating vortices in both the casing and hub regions. The duct mean rise angle determined the severity of adverse pressure gradient in the casing's first bend whereas the duct area ratio mainly governed the second bend's static pressure rise. The combination of upstream wake flow and the first bend's adverse pressure gradient caused the boundary layer to separate and intensify the strength of counter-rotating vortices. At high mean rise angle, the separation became stronger at the casing's first bend and moved farther upstream. At high area ratios, a two-dimensional separation appeared on the casing and resulted in increased loss. Pressure loss penalties increased significantly with increasing duct mean rise angle and area ratio.

Section 5: Non-US Gov Employees+ Reg Authors
Your Session has timed out. Please sign back in to continue.

References

Figures

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