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Title: Modeling shrouded stator cavity flows in axial-flow compressors

Abstract

Experiments and computational analyses were completed to understand the nature of shrouded stator cavity flows. From this understanding, a one-dimensional model of the flow through shrouded stator cavities was developed. This model estimates the leakage mass flow, temperature rise, and angular momentum increase through the cavity, given geometry parameters and the flow conditions at the interface between the cavity and primary flow path. This cavity model consists of two components, one that estimates the flow characteristics through the labyrinth seals and the other that predicts the transfer of momentum due to windage. A description of the one-dimensional model is given. The incorporation and use of the one-dimensional model in a multistage compressor primary flow analysis tool is described. The combination of this model and the primary flow solver was used to reliably simulate the significant impact on performance of the increase of hub seal leakage in a twelve-stage axial-flow compressor. Observed higher temperatures of the hub region fluid, different stage matching, and lower overall efficiencies and core flow than expected could be correctly linked to increased hub seal clearance with this new technique. The importance of including these leakage flows in compressor simulations is shown.

Authors:
; ;
Publication Date:
Research Org.:
Rolls-Royce Allison, Indianapolis, IN (US)
OSTI Identifier:
20086913
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Turbomachinery; Journal Volume: 122; Journal Issue: 1; Conference: 44th International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN (US), 06/07/1999--06/10/1999; Other Information: PBD: Jan 2000
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS; GAS COMPRESSORS; GAS FLOW; STATORS; MATHEMATICAL MODELS

Citation Formats

Wellborn, S.R., Tolchinsky, I., and Okiishi, T.H. Modeling shrouded stator cavity flows in axial-flow compressors. United States: N. p., 2000. Web. doi:10.1115/1.555427.
Wellborn, S.R., Tolchinsky, I., & Okiishi, T.H. Modeling shrouded stator cavity flows in axial-flow compressors. United States. doi:10.1115/1.555427.
Wellborn, S.R., Tolchinsky, I., and Okiishi, T.H. Sat . "Modeling shrouded stator cavity flows in axial-flow compressors". United States. doi:10.1115/1.555427.
@article{osti_20086913,
title = {Modeling shrouded stator cavity flows in axial-flow compressors},
author = {Wellborn, S.R. and Tolchinsky, I. and Okiishi, T.H.},
abstractNote = {Experiments and computational analyses were completed to understand the nature of shrouded stator cavity flows. From this understanding, a one-dimensional model of the flow through shrouded stator cavities was developed. This model estimates the leakage mass flow, temperature rise, and angular momentum increase through the cavity, given geometry parameters and the flow conditions at the interface between the cavity and primary flow path. This cavity model consists of two components, one that estimates the flow characteristics through the labyrinth seals and the other that predicts the transfer of momentum due to windage. A description of the one-dimensional model is given. The incorporation and use of the one-dimensional model in a multistage compressor primary flow analysis tool is described. The combination of this model and the primary flow solver was used to reliably simulate the significant impact on performance of the increase of hub seal leakage in a twelve-stage axial-flow compressor. Observed higher temperatures of the hub region fluid, different stage matching, and lower overall efficiencies and core flow than expected could be correctly linked to increased hub seal clearance with this new technique. The importance of including these leakage flows in compressor simulations is shown.},
doi = {10.1115/1.555427},
journal = {Journal of Turbomachinery},
number = 1,
volume = 122,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}