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Trapped vortex combustion: Insights from laser diagnostics & Numerical simulations

Ravikrishna, RV (2019) Trapped vortex combustion: Insights from laser diagnostics & Numerical simulations. In: Asia-Pacific Conference on Combustion, 1-5 July 2019, Japan.

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Syngas is an important fuel for power generation applications, since it can be obtained from both biomass and coal gasification. It consists mainly of a mixture of carbon monoxide, hydrogen and other diluents. One of the challenges arises from the very low calorific value of the syngas thus obtained. Trapped vortex combustion (TVC) is a relatively new concept for gas turbine combustors with potential in achieving stable combustion under wide operating conditions especially with low calorific value fuels. This paper will summarize a series of investigations in an optically-accessible TVC facility. Specifically, in-situ measurements of velocity, OH and mixture fraction using techniques such as Planar Laser-induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV) are used to identify important parameters dictating stability and emissions. These studies have shown the fuel-air momentum flux ratio to be an important governing parameter in addition to identifying various flame stabilization regimes. Numerical simulations have been used to evaluate several innovative ideas to improve stability. The efficacy of one such innovation involving use of a flow guide vane has been confirmed in experiments. Overall, this paper will highlight how the in-situ experimental data coupled with insight from simulations confirm the advantages of adapting the TVC concept for gas turbines, and provide guidelines for stable and efficient operation of the combustor with syngas fuel. © Asia-Pacific Conference on Combustion, ASPACC 2019.All right reserved.

Item Type: Conference Paper
Publication: 12th Asia-Pacific Conference on Combustion, ASPACC 2019
Publisher: Combustion Institute
Additional Information: The copyright of this article belongs to Asia-Pacific Conference on Combustion
Keywords: Calorific value; Carbon monoxide; Combustors; Fuels; Gas turbines; Laser diagnostics; Mixtures; Numerical models; Synthesis gas; Velocity measurement; Vortex flow, Gas turbine combustor; Governing parameters; In-situ measurement; Momentum flux ratios; Particle image velocimetries; Planar laser induced fluorescence; Power generation applications; Trapped vortex combustions, Coal combustion
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 31 Mar 2021 10:44
Last Modified: 25 Sep 2022 07:11
URI: https://eprints.iisc.ac.in/id/eprint/65394

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