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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Numerical and Experimental Analysis of the Temperature Distribution in a Hydrogen Fuelled Combustor for a 10 MW Gas Turbine

[+] Author and Article Information
Massimo Masi

Department of Mechanical Engineering, University of Padova, via Venezia, 1-35131 Padova, Italymassimo.masi@unipd.it

Paolo Gobbato, Andrea Toffolo, Andrea Lazzaretto

Department of Mechanical Engineering, University of Padova, via Venezia, 1-35131 Padova, Italy

Stefano Cocchi

 GE Oil & Gas—Nuovo Pignone SpA, via Felice Matteucci, 2-50127 Firenze, Italystefano.cocchi@ge.com

The simplified global reaction mechanism requires the natural gas to be considered as pure methane. The difference in LHV is taken into account in the simulations to keep the thermal input unchanged.

J. Eng. Gas Turbines Power 133(2), 021506 (Oct 28, 2010) (9 pages) doi:10.1115/1.4002017 History: Received April 15, 2010; Revised April 27, 2010; Published October 28, 2010; Online October 28, 2010

Proper cooling of the hot components and an optimal temperature distribution at the turbine inlet are fundamental targets for gas turbine combustors. In particular, the temperature distribution at the combustor discharge is a critical issue for the durability of the turbine blades and the high performance of the engine. At present, CFD is a widely used tool to simulate the reacting flow inside gas turbine combustors. This paper presents a numerical analysis of a single can type combustor designed to be fed both with hydrogen and natural gas. The combustor also features a steam injection system to restrain the NOx pollutants. The simulations were carried out to quantify the effect of fuel type and steam injection on the temperature field. The CFD model employs a computationally low cost approach, thus the physical domain is meshed with a coarse grid. A full-scale test campaign was performed on the combustor: temperatures at the liner wall and the combustor outlet were acquired at different operating conditions. These experimental data, which are discussed, were used to evaluate the capability of the present CFD model to predict temperature values for combustor operation with different fuels and steam to fuel ratios.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sectional view of the GE10 gas turbine combustor

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Figure 2

(a) Rendering showing the rows of thermocouples installed to measure the liner wall temperatures. (b) Detail of the thermocouples installed in a 30 deg sector of the combustor outlet section.

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Figure 3

Temperatures measured along the liner wall

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Figure 4

Nondimensional temperatures along the three circular rows indicated in Fig. 2

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Figure 5

(a) Section of the geometrical model. (b) Section of the computational grid

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Figure 6

Temperature fields around the liner [K]

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Figure 7

Comparison between the experimental data and temperature profiles along the liner wall (see Fig. 2 for the arrangement of the rows) [K]

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Figure 8

Natural gas: comparison between the experimental data and temperature profiles along the circular rows shown in Fig. 2

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Figure 9

Hydrogen: comparison between the experimental data and temperature profiles along the circular rows shown in Fig. 2

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