Gas Turbines: Microturbines and Small Turbomachinery

A Mobile Test Rig for Micro Gas Turbines Based on a Thermal Power Measurement Approach

[+] Author and Article Information
Stefan aus der Wiesche

 Muenster University of Applied Sciences, Department of Mechanical Engineering, Stegerwaldstr. 39, 48565, Steinfurt, Germanywiesche@fh-muenster.de

J. Eng. Gas Turbines Power 134(11), 112301 (Sep 28, 2012) (8 pages) doi:10.1115/1.4007201 History: Received July 10, 2012; Revised July 12, 2012; Published September 28, 2012; Online September 28, 2012

It is widely considered that micro gas turbines are potential devices for future energy needs. However, many micro gas turbine development projects have failed, particularly those with a very low power level below 10 kW. The financial and experimental capabilities for micro gas turbine development projects are typically extremely limited; hence, there is a need for low cost mobile test rigs. To close this gap, a robust mobile test rig for turboshaft micro gas turbines was developed and validated. The shaft power can be determined using a thermal measurement approach. This circumvents any issues associated with high voltage and electric current levels. The shaft power can be obtained by a straightforward parameter identification procedure based on simple temperature measurements. This approach is feasible because an analytical expression for the transient temperature field can be obtained. The test rig and thermal power measurement concept were fully validated by a commercial micro gas turbine; good agreement was obtained between the experimental results and the theoretical process data.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Test rig and its instrumentation

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Figure 2

Sketch of the micro gas turbine SPM5

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Figure 3

Instrumentation of the two-spool turboshaft micro gas turbine SPM5

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Figure 4

Complete mobile test rig

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Figure 5

Micro gas turbine on its test bench

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Figure 6

Photograph of the brake

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Figure 7

Simplified thermal brake model

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Figure 8

Temperature response against time for an applied shaft power signal and determination of the final shaft power value

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Figure 9

Recorded data during transient stage

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Figure 10

Simulated T, s-diagram of a micro gas turbine simple cycle

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Figure 11

Brake temperature growth rate against dissipated shaft power

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Figure 12

Drawing of the brake (all dimensions in mm)

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Figure 13

Brake performance chart: Torque against rotor speed



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