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RESEARCH PAPERS

Numerical Study of the Heat Transfer in Micro Gas Turbines

[+] Author and Article Information
T. Verstraete

 von Kármán Institute for fluid Dynamics, Waterloose steenweg, 72, 1640, Sint-Genesius-Rode, Belgiumverstraete@vki.ac.be

Z. Alsalihi

 von Kármán Institute for fluid Dynamics, Waterloose steenweg, 72, 1640, Sint-Genesius-Rode, Belgiumalsalihi@vki.ac.be

R. A. Van den Braembussche

 von Kármán Institute for fluid Dynamics, Waterloose steenweg, 72, 1640, Sint-Genesius-Rode, Belgiumvdb@vki.ac.be

J. Turbomach 129(4), 835-841 (Oct 11, 2006) (7 pages) doi:10.1115/1.2720874 History: Received June 20, 2006; Revised October 11, 2006

This paper presents a numerical investigation of the heat transfer inside a micro gas turbine and its impact on the performance. The large temperature difference between turbine and compressor in combination with the small dimensions results in a high heat transfer causing a drop in efficiency of both components. Present study aims to quantify this heat transfer and to reveal the different mechanisms that contribute to it. A conjugate heat transfer solver has been developed for this purpose. It combines a three-dimensional (3D) conduction calculation inside the rotor and the stator with a 3D flow calculation in the radial compressor, turbine and gap between stator and rotor. The results for micro gas turbines of different size and shape and different material characteristics are presented and the impact on performance is evaluated.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 6

Temperature distribution (in degrees Kelvin) in geo3. The interval in between the isolines is 25K.

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Figure 7

Temperature distribution (in degrees Kelvin) in compressor of geo2. The interval in between the isolines is 20K.

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Figure 8

Temperature distribution (in degrees Kelvin) in turbine of geo2. The interval in between the isolines is 20K.

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Figure 9

Total temperature (in degrees Kelvin) and flow field in the compressor (left) and turbine (right) cavity

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Figure 10

geo2 with a modified stator geometry. A 2mm gap is inserted in the middle of the stator. The interval in between the isolines is 25K.

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Figure 11

geo2 made of steel. The interval in between the isolines is 25K.

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Figure 1

Micro gas turbine layout

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Figure 2

Computational domains

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Figure 3

Convergence history of L∞

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Figure 4

Heat transfer in the micro gas turbine

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Figure 5

Temperature distribution (in degrees Kelvin) in geo1. The interval between the isolines is 25K.

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