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Title: Analysis of hot streak effects on turbine rotor heat load

Abstract

The influence of inlet hot streak temperature distortion on turbine blade heat load was explored on a transonic axial flow turbine stage test article using a three-dimensional, multiblade row unsteady Euler code. The turbine geometry was the same as that used for a recently reported testing of hot streak influence. Emphasis was placed on elucidating the physical and mechanisms by which hot streaks affect turbine durability. It was found that temperature distortion significantly increases both blade surface heat load nonuniformity and total blade heat load by as much as 10--30% (mainly in the pressure surface), and that the severity of this influence is a strong function of turbine geometry and flow conditions. Three physical mechanisms were identified that drive the heat load nonuniformity: buoyancy, wake convection (the Kerrebrock-Mikolajczak effect), and rotor-stator interactions. The latter can generate significant nonuniformity of the time-averaged relative frame rotor inlet temperature distribution. Dependence of these effects on turbine design variables was investigated to shed light on the design space, which minimizes the adverse effects of hot streaks.

Authors:
 [1];  [2]
  1. Pratt and Whitney, East Hartford, CT (United States)
  2. Massachusetts Inst. of Tech., Cambridge, MA (United States). Gas Turbine Lab.
Publication Date:
Sponsoring Org.:
Department of the Air Force, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
OSTI Identifier:
516724
Report Number(s):
CONF-960608-
Journal ID: JOTUEI; ISSN 0889-504X; TRN: IM9738%%33
Resource Type:
Journal Article
Journal Name:
Journal of Turbomachinery
Additional Journal Information:
Journal Volume: 119; Journal Issue: 3; Conference: 41. American Society of Mechanical Engineers (ASME) international gas turbine and aeroengine congress and exposition, Birmingham (United Kingdom), 10-13 Jun 1996; Other Information: PBD: Jul 1997
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; TURBINE BLADES; ENERGY EFFICIENCY; COOLING LOAD; GAS TURBINE ENGINES; COOLING SYSTEMS; TEMPERATURE DISTRIBUTION

Citation Formats

Shang, T, and Epstein, A H. Analysis of hot streak effects on turbine rotor heat load. United States: N. p., 1997. Web. doi:10.1115/1.2841156.
Shang, T, & Epstein, A H. Analysis of hot streak effects on turbine rotor heat load. United States. https://doi.org/10.1115/1.2841156
Shang, T, and Epstein, A H. 1997. "Analysis of hot streak effects on turbine rotor heat load". United States. https://doi.org/10.1115/1.2841156.
@article{osti_516724,
title = {Analysis of hot streak effects on turbine rotor heat load},
author = {Shang, T and Epstein, A H},
abstractNote = {The influence of inlet hot streak temperature distortion on turbine blade heat load was explored on a transonic axial flow turbine stage test article using a three-dimensional, multiblade row unsteady Euler code. The turbine geometry was the same as that used for a recently reported testing of hot streak influence. Emphasis was placed on elucidating the physical and mechanisms by which hot streaks affect turbine durability. It was found that temperature distortion significantly increases both blade surface heat load nonuniformity and total blade heat load by as much as 10--30% (mainly in the pressure surface), and that the severity of this influence is a strong function of turbine geometry and flow conditions. Three physical mechanisms were identified that drive the heat load nonuniformity: buoyancy, wake convection (the Kerrebrock-Mikolajczak effect), and rotor-stator interactions. The latter can generate significant nonuniformity of the time-averaged relative frame rotor inlet temperature distribution. Dependence of these effects on turbine design variables was investigated to shed light on the design space, which minimizes the adverse effects of hot streaks.},
doi = {10.1115/1.2841156},
url = {https://www.osti.gov/biblio/516724}, journal = {Journal of Turbomachinery},
number = 3,
volume = 119,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 1997},
month = {Tue Jul 01 00:00:00 EDT 1997}
}