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research-article

A SENSITIVITY STUDY OF GAS TURBINE EXHAUST DIFFUSER-COLLECTOR PERFORMANCE AT VARIOUS INLET SWIRL ANGLES AND STRUT STAGGER ANGLES

[+] Author and Article Information
Michal Siorek

Sr. Principal Engineer, Turbine Aerodynamics, Solar Turbines Incorporated, San Diego, CA, USA
siorek_michal_p@solarturbines.com

Stephen A. Guillot

President of Engineering, Techsburg Inc., 265 Industrial Drive, Christiansburg, VA, USA
sguillot@techsburg.com

Song Xue

Research Engineer, Techsburg Inc., 265 Industrial Drive, Christiansburg, VA, USA
sxue@ConceptsNrec.com

Wing Ng

CEO and Chairman, Techsburg Inc., 265 Industrial Drive, Christiansburg, VA, USA
wng@techsburg.com

1Corresponding author.

ASME doi:10.1115/1.4038856 History: Received July 28, 2017; Revised December 11, 2017

Abstract

This paper describes studies completed using a quarter-scaled rig to assess the impact of turbine exit swirl angle and strut stagger on a turbine exhaust system consisting of an integral diffuser-collector. Advanced testing methods were applied to ascertain exhaust performance for a range of inlet conditions aerodynamically matched to flow exiting an industrial gas turbine. Flow visualization techniques along with complementary Computational Fluid Dynamics (CFD) predictions were used to study flow behavior along the diffuser endwalls. Complimentary CFD analysis was also completed with the aim to ascertain the performance prediction capability of modern day analytical tools for design phase and off-design analysis. The K-Epsilon model adequately captured the relevant flow features within both the diffuser and collector, and the model accurately predicted the recovery at design conditions. At off-design conditions, the recovery predictions were found to be pessimistic. The integral diffuser-collector exhaust accommodated a significant amount of inlet swirl without a degradation in performance, so long as the inlet flow direction did not significantly deviate from the strut stagger angle. Strut incidence at the hub was directly correlated with reduction in overall performance, whereas the diffuser-collector performance was not significantly impacted by strut incidence at the shroud.

Solar Turbines Incorporated
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