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Research Papers: Gas Turbines: Turbomachinery

Reconciling Compressor Performance Differences for Varying Ambient Inlet Conditions

[+] Author and Article Information
Natalie R. Smith

Department of Aeronautics and Astronautics,
Purdue University,
500 Allison Road,
West Lafayette, IN 47907
e-mail: smith773@purdue.edu

Reid A. Berdanier

Department of Mechanical Engineering,
Purdue University,
500 Allison Road,
West Lafayette, IN 47907
e-mail: rberdani@purdue.edu

John C. Fabian

Department of Mechanical Engineering,
Purdue University,
500 Allison Road,
West Lafayette, IN 47907
e-mail: fabian@purdue.edu

Nicole L. Key

Associate Professor
Department of Mechanical Engineering,
Purdue University,
500 Allison Road,
West Lafayette, IN 47907
e-mail: nkey@purdue.edu

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 21, 2015; final manuscript received April 28, 2015; published online June 2, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(12), 122603 (Jun 02, 2015) (9 pages) Paper No: GTP-15-1103; doi: 10.1115/1.4030518 History: Received March 21, 2015

Careful experimental measurements can capture small changes in compressor total pressure ratio (TPR), which arise with subtle changes in an experiment's configuration. Research facilities that use unconditioned atmospheric air must account for changes in ambient compressor inlet conditions to establish repeatable performance maps. A unique dataset from a three-stage axial compressor has been acquired over the duration of 12 months in the Midwest U.S., where ambient conditions change significantly. The trends show a difference in compressor TPR measured on a cold day versus a warm day despite correcting inlet conditions to sea level standard day. To reconcile these differences, this paper explores correcting the compressor exit thermodynamic state, Reynolds number effects, and variations in rotor tip clearance (TC) as a result of differences in thermal growth.

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Figures

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Fig. 1

Effects of ambient pressure, temperature, and RH changes on the enthalpy, density, and ratio of specific heats of air

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Fig. 2

Compressor flowpath including station numbering scheme

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Fig. 3

Difference in TPR between a hot and cold day at 3% and 4% TC

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Fig. 4

Percent difference change in TPR with density and work coefficient correction on a hot and cold day

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Fig. 5

Reynolds number index on a hot and cold day

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Fig. 6

Reynolds number fluctuations with ambient inlet conditions: (a) temperature, (b) RH, and (c) pressure

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Fig. 7

TPR variations with ambient temperature for three nominal TCs: (a) 1.5% TC, (b) 3% TC, and (c) 4% TC

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Fig. 8

Total pressure wakes at 80% span for 3% TC at near-stall loading conditions, hot and cold days

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Fig. 9

Radial total pressure profiles from traversed data downstream of each row for a cold and hot day for the 3% TC

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Fig. 10

TPR trends with measured rotor 1 TC at a near-stall operating condition

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Fig. 11

Radial profiles for three nominal TCs on a hot and cold day

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