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Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Ten Years of Experience With a Small Jet Engine as a Support for Education

[+] Author and Article Information
O. Léonard

Turbomachinery Group, University of Liège, Chemin des Chevreuils, 1 B-4000 Liège, Belgiumo.leonard@ulg.ac.be

J. P. Thomas

Turbomachinery Group, University of Liège, Chemin des Chevreuils, 1 B-4000 Liège, Belgiumjp.thomas@ulg.ac.be

S. Borguet

Turbomachinery Group, University of Liège, Chemin des Chevreuils, 1 B-4000 Liège, Belgiums.borguet@ulg.ac.be

Integral of time multiplied by absolute error: ITAE=0Tt|e(t)|dt.

J. Eng. Gas Turbines Power 131(1), 012303 (Oct 10, 2008) (10 pages) doi:10.1115/1.2967487 History: Received April 01, 2008; Revised April 08, 2008; Published October 10, 2008

In 1997 the Turbomachinery Group of the University of Liège decided to acquire a small jet engine to illustrate the courses in propulsion and to provide the students with the opportunity to get some experience on data measurement, acquisition, and interpretation. Among others, the SR-30 engine from Turbine Technology Ltd. Chetek, WI was chosen. It consists of a single spool, single flow engine with a centrifugal compressor, a reversed combustion chamber, an axial turbine, and a fixed convergent nozzle. This engine was installed on a test bench allowing for manual control and providing fuel and oil to the engine. The original setup included measurements of intercomponent pressure and temperatures, exhaust gas temperature, and rotational speed. Since then both the engine and the test bench have been deeply modified. These modifications were led by a triple objective: the improvement and the enrichment of the measurement chain, the widening of the engine’s operational domain, and, last but not the least, the wish to offer appealing hands-on projects to the students. All these modifications were performed at the University of Liège and were conducted by the students as part of their Master theses. Several performance models of the engine were developed to support data validation and engine condition diagnostic. This paper summarizes the developments conducted with and by the students, and presents the experience that was gained by using this engine as a support for education.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cutaway of the SR-30 engine

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Figure 2

SR-30 engine on its test bench

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Figure 3

Hanging plate supporting the engine and strapping system

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Figure 4

Thrust measuring load cell

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Figure 5

Air flowmeter and variable geometry inlet guide vane

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Figure 6

The SR-30 and the variable area nozzle

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Figure 7

Inlet guide vane

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Figure 8

Rear part of the engine and fuel valve operating system

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Figure 9

Schematic of the ECOSIMPRO model

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Figure 10

Tuning procedure using an extended Kalman filter

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Figure 11

Fuel flow—EGT curve

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Figure 12

Fuel flow—airflow curve

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Figure 13

Trajectory of the operating point for a deceleration followed by an acceleration in the compressor map: steady-line (red curve), limits on the mass flow (black curves), and steady operating points (black circles)

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Figure 14

Evolution of the rotational speed with (red line) and without (blue line) physical limits

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Figure 15

Rejection of an external perturbation

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Figure 16

Follow-up of a prescribed rotational speed

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