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Technical Briefs

Real-Time Execution of a High Fidelity Aero-Thermodynamic Turbofan Engine Simulation

[+] Author and Article Information
Igor Fuksman

 Pratt and Whitney, 400 Main Street, East Hartford, CT 06108igor.fuksman@pw.utc.com

Steven Sirica

 Pratt and Whitney, 400 Main Street, East Hartford, CT 06108steven.sirica@pw.utc.com

J. Eng. Gas Turbines Power 134(5), 054501 (Mar 06, 2012) (4 pages) doi:10.1115/1.4004856 History: Received June 22, 2011; Revised August 05, 2011; Published March 06, 2012; Online March 06, 2012

In the past, a typical way of executing simulations in a real-time environment had been to use transfer function models, state-variable models, or reduced-order aero-thermodynamic models. These models are typically not as accurate as the conventional full-fidelity aero-thermodynamic simulations used as a basis for the generation of real-time models. Also, there is a cost associated with the creation and maintenance of these derived real-time models. The ultimate goal is to use the high fidelity aero-thermodynamic simulation as the real-time model. However, execution of the high fidelity aero-thermodynamic simulation in a real-time environment is a challenging objective since accuracy of the simulation cannot be sacrificed to optimize execution speed, yet execution speed still has to be limited by some means to fit into real-time constraint. This paper discusses the methodology used to resolve this challenge, thereby enabling use of a contemporary turbofan engine high fidelity aero-thermodynamic simulation in real-time environments. This publication reflects the work that was initially presented at the ASME Turbo Expo 2011 (Fuksman and Sirica, 2011, “Real-Time Execution of a High Fidelity Aero-Thermodynamic Turbofan Engine Simulation,” ASME Turbo Expo, Jun. 6-10, Vancouver, Canada, Paper No. GT2011-46661).

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Transient pass count in a 40-balance simulation with Jacobian matrix calculated every point

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Figure 2

Impact of the balance simplification on the real-time constraint compliance

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Figure 3

Net thrust comparison of the model in conventional transient mode versus real-time mode with new solver setup

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Figure 4

Net thrust results of failure mode test cases

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Figure 5

Operating capabilities of real-time simulation

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