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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Enhanced Gas Turbine Performance Simulation Using CFD Modules in a 2D Representation of the Low-Pressure System for a High-Bypass Turbofan

[+] Author and Article Information
Friederike C. Mund, Georgios Doulgeris, Pericles Pilidis

School of Engineering, Cranfield University, Cranfield MK 43 0AL, UK

J. Eng. Gas Turbines Power 129(3), 761-768 (Feb 01, 2006) (8 pages) doi:10.1115/1.2364197 History: Received October 01, 2005; Revised February 01, 2006

The improvement of performance simulation for gas turbines has been approached in very different ways. In particular for high-bypass turbofans, efforts have been made to investigate radial flow distributions. The aim of the presented study was to combine a conventional characteristics-based performance code using a 2D representation of the fan with 2D representations of the adjoining intake and bypass system. Computational fluid dynamics (CFD) was the chosen tool to generate modules for the intake, bypass duct, and bypass nozzle. This approach required geometry data. A design procedure to generate these components in an axisymmetric meridional fashion and the numerical requirements for the CFD modules were developed. Typical component performances were predicted and the combined use of CFD and the performance code showed that in terms of performance, the inclusion of intake and bypass losses and the radial inlet distribution was worth considering. In particular, however, the required numerical effort was significant.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Performance model for a two-shaft high-bypass turbofan

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Figure 2

Key design parameters for a propulsion system

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Figure 3

Procedure to derive key intake design parameters

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Figure 4

Streamwise distribution of the cross-sectional bypass area and bypass contours

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Figure 5

Structured mesh block using the boundary layer function to create multiblocks

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Figure 6

Pressure recovery factor for different domain heights at static conditions

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Figure 7

Pressure recovery factor of the bypass-section versus radial nodes

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Figure 8

Residuals for intake matching between performance and CFD tools

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Figure 9

Key whole-engine performance data for conventional 0D and 2D performance simulation using CFD modules

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Figure 10

Radial profiles of the intake pressure recovery and undistorted and distorted fan pressure ratio

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