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

# Dynamic Adaptation of Aerodynamic Flame Stabilization of a Premix Swirl Burner to Fuel Reactivity Using Fuel Momentum

[+] Author and Article Information
J. Sangl1

Lehrstuhl für Thermodynamik, TU München, D-85745 Garching, Germanysangl@td.mw.tum.de

C. Mayer, T. Sattelmayer

Lehrstuhl für Thermodynamik, TU München, D-85745 Garching, Germany

1

Corresponding author.

J. Eng. Gas Turbines Power 133(7), 071501 (Mar 16, 2011) (11 pages) doi:10.1115/1.4002659 History: Received May 10, 2010; Revised May 11, 2010; Published March 16, 2011; Online March 16, 2011

## Abstract

Due to the expected increase in available fuel gas variants in the future and the interest in independence from a specific fuel, fuel flexible combustion systems are required for future gas turbine applications. Changing the fuel used for lean premixed combustion can lead to serious reliability problems in gas turbine engines caused by the different physical and chemical properties of these gases. A new innovative approach to reach efficient, safe, and low-emission operation for fuels such as natural gas, syntheses gas, and hydrogen with the same burner is presented in this paper. The basic idea is to use the additionally available fuel momentum of highly reactive gases stemming from their lower Wobbe index (lower volumetric heating value and density) compared with lowly reactive fuels. Using fuel momentum opens the opportunity to influence the vortex dynamics of swirl burners designed for lowly reactive gases in a favorable way for proper flame stabilization of highly reactive fuels without changing the hardware geometry. The investigations presented in this paper cover the development of the optimum basic aerodynamics of the burner and the determination of the potential of the fuel momentum in water channel experiments using particle image velocimetry. The results show that proper usage of the fuel momentum has enough potential to adjust the flow field to different fuels and their corresponding flame behavior. As the main challenge is to reach flashback safe fuel flexible burner operation, the main focus of the study lies on avoiding combustion induced vortex breakdown. The mixing quality of the resulting injection strategy is determined by applying laser induced fluorescence in water channel tests. Additional $OH∗$ chemiluminescence and flashback measurements in an atmospheric combustion test rig confirm the water channel results for $CH4$, $CH4/H2$ mixtures, $H2$ with $N2$ dilution, and pure $H2$ combustion. They also indicate a large operating window between flashback and lean blow out and show expected $NOx$ emission levels. In summary, it is shown for a conical four slot swirl generator geometry that the proposed concept of using the fuel momentum for tuning of the vortex dynamics allows aerodynamic flame stabilization for different fuels in the same burner.

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## Figures

Figure 1

Burner geometry and injection strategy

Figure 2

PIV-results downstream of the burner exit for the single injection methods

Figure 3

LIF-results for the single injection methods

Figure 4

PIV-results downstream of the burner exit for the combined injection methods

Figure 5

LIF-results for the combined injection methods

Figure 6

Scheme of the atmospheric combustion test rig

Figure 7

Left: axial velocity measured in the water channel (PIV). Right: deconvoluted OH∗-chemiluminescence image of the flame

Figure 8

Comparison of flame shape for different injection configurations using CH4

Figure 9

Flame behavior when increasing H2 volume fraction (externally premixed)

Figure 10

Axial fuel injection (H2/N2)

Figure 11

Influence of axial fuel injection on CIVB stability

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