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

Three-Stream Flamelet Model for Industrial Applications

[+] Author and Article Information
Dirk Riechelmann

Department of Heat and Fluid Dynamics, Research Laboratory, IHI Corporation, Yokohama, Shin-Nakahara-cho 235-8501, Japandirk_riechelmann@ihi.co.jp

Masahiro Uchida

Department of Heat and Fluid Dynamics, Research Laboratory, IHI Corporation, Yokohama, Shin-Nakahara-cho 235-8501, Japan

J. Eng. Gas Turbines Power 132(6), 061507 (Mar 30, 2010) (8 pages) doi:10.1115/1.4000247 History: Received October 30, 2008; Revised September 02, 2009; Published March 30, 2010; Online March 30, 2010

Efficient turbulent combustion models are typically designed for the numerical simulation of two-stream problems, namely, the combustion of fuel in air. There are applications, however, where large amounts of a diluent such as water steam or recirculated exhaust gas is supplied to the combustor independent of fuel and air supplies. In such cases, classical approaches become quite time-consuming. In the present paper, a new three-stream flamelet model is presented, which is essentially an extension of the two-stream flamelet model for diffusion flames. Key points of the approach are the introduction of a second mixture fraction variable and the efficient establishment of the flamelet library. After presentation of the theory, the applicability of the new model is demonstrated by comparison with experimental results for the lift-off height of jet diffusion flames.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Example of combined cycle gas turbine power generation system (2)

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Figure 2

Phenomenological view of turbulent diffusion flame

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Figure 3

Supplying stream arrangements in the three-stream flamelet model

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Figure 4

Change in main species mass fractions with mixture Z and second mixture ZS fractions. ZS: mixing of steam (third stream) with air (second stream); Z: mixing of steam/air mixture with main fuel (first stream). Steam may contain small amounts of fuel.

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Figure 5

Geometry of counterflow diffusion flame

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Figure 6

Maximal temperature versus dissipation rate for various CO2 mass fractions in oxidizer stream (Toxidizer=573 K, TCH4=300 K, p=0.1 MPa)

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Figure 7

Critical dissipation rate for extinction of methane in air doped with CO2 (0.1 MPa, Toxidizer=573 K, TCH4=300 K)

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Figure 8

Experimental apparatus for model evaluation

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Figure 9

Images and numerical result for temperature distribution in methane-air flame, where air is diluted with carbon dioxide

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Figure 10

Measured and calculated lift-off heights versus CO2-content in air

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Figure 11

Accuracy of flamelet library: comparison of straight forward integration with approximated integration

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