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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Dynamics of a High-Frequency Fuel Actuator and its Applications for Combustion Instability Control

[+] Author and Article Information
Tongxun Yi, Ephraim J. Gutmark

Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45220-0070

J. Eng. Gas Turbines Power 129(3), 648-654 (Dec 20, 2006) (7 pages) doi:10.1115/1.2718558 History: Received December 29, 2004; Revised December 20, 2006

The present paper performs complementary experimental and theoretical investigations of a pump-style, high-frequency, magnetostrictive fuel actuator, which achieves fuel modulations by periodically “pushing” fuel out of a piston-cylinder unit instead of by modulating the flow area. The low-order models are developed to identify relevant parameters and investigate their influences on fuel modulations. This fuel actuator is proprietary, its detailed internal structure and dimension are not available, so only qualitative comparisons between the model predictions and experiments are made. Experiments validate the trend of the model predictions. A system-identification-based LQG controller is designed to quickly suppress strong interferences of fuel modulations with the mean fuel flow rate. Improvements to the fuel setup have been made according to the model predictions, which have been experimentally shown to be beneficial to combustion instability control.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Atmospheric combustion rig with the TARS

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Figure 2

Structure of the PCU

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Figure 12

Failure in combustion instability control due to slow regulation of ṁ0

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Figure 13

Simulink model for closed-loop system identification

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Figure 14

LQG control of ṁ0

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Figure 15

Combustion instability control

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Figure 4

Fuel flow rate measurement; lor=1E−3m and Aor=2.5E−6m2

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Figure 5

Effects of L2 on fuel modulations

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Figure 6

Effects of L1 on fuel modulation

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Figure 7

Effects of At2 on fuel modulations

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Figure 8

Effects of ṁ0 on fuel modulation

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Figure 9

The slow responses and the actuating dead zone of the Titan oscillator

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Figure 10

The adverse effects of bubbles on fuel modulations

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Figure 11

Strong interferences of fuel modulations with ṁ0

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Figure 3

Sketch of the simplified fluidic circuit

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