Quantitative OH Planar Laser Induced Fluorescence Diagnostics of Syngas and Methane Combustion in a Cavity Combustor

Krishna, S.; Ravikrishna, RV

doi:10.1080/00102202.2015.1047015

Cited by 14 publications

(11 citation statements)

References 18 publications

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“…This section discusses the results of numerical simulations carried out using RANS and LES framework and the comparison of these results with previous experiments [6,7]. Insights are also obtained from the simulations to explain the results of the exhaust measurements reported in the next section.…”

Section: Numerical Studies: Rans and Les Simulationsmentioning

confidence: 89%

“…It can be seen that simulations and experiments show similar OH contours in terms of location of the peak OH concentration. Previous studies [6,7]…”

Section: Reacting Flow Simulations: Oh Concentration Profilesmentioning

confidence: 99%

“…Subsequently we carried out OH-PLIF studies and reported flame stabilization regimes in the cavity based on OH concentration fields [7].…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Studies on a Syngas-Fired Ultra Low NOx Combustor

Krishna

Ravikrishna

2017

Journal of Engineering for Gas Turbines and Power

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Simulations and exhaust measurements of temperature and pollutants in a syngas-fired model trapped vortex combustor for stationary power generation applications are reported. Numerical simulations employing Reynolds-averaged Navier–Stokes (RANS) and large eddy simulations (LES) with presumed probability distribution function (PPDF) model were also carried out. Mixture fraction profiles in the trapped vortex combustor (TVC) cavity for nonreacting conditions show that LES simulations are able to capture the mean mixing field better than the RANS-based approach. This is attributed to the prediction of the jet decay rate and is reflected on the mean velocity magnitude fields, which reinforce this observation at different sections in the cavity. Both RANS and LES simulations show close agreement with the experimentally measured OH concentration; however, the RANS approach does not perform satisfactorily in capturing the trend of velocity magnitude. LES simulations satisfactorily capture the trend observed in exhaust measurements which is primarily attributed to the flame stabilization mechanism. In the exhaust measurements, mixing enhancement struts were employed, and their effect was evaluated. The exhaust temperature pattern factor was found to be poor for baseline cases, but improved with the introduction of struts. NO emissions were steadily below 3 ppm across various flow conditions, whereas CO emissions tended to increase with increasing momentum flux ratios (MFRs) and mainstream fuel addition. Combustion efficiencies ∼96% were observed for all conditions. The performance characteristics were found to be favorable at higher MFRs with low pattern factors and high combustion efficiencies.

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Section: Numerical Studies: Rans and Les Simulationsmentioning

confidence: 89%

“…It can be seen that simulations and experiments show similar OH contours in terms of location of the peak OH concentration. Previous studies [6,7]…”

Section: Reacting Flow Simulations: Oh Concentration Profilesmentioning

confidence: 99%

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Numerical and Experimental Studies on a Syngas-Fired Ultra Low NOx Combustor

Krishna

Ravikrishna

2017

Journal of Engineering for Gas Turbines and Power

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“…[10][11][12][13][14][15], while in general a lower number of studies is present concerning lean premixed combustion experiments, e.g. [16][17][18][19][20][21]. To the best of author's knowledge such a lack of data is evident when considering turbulent flame in real scale gas turbine geometries.…”

Section: Introductionmentioning

confidence: 99%

Experimental Flame Front Characterisation in a Lean Premix Burner Operating with Syngas Simplified Model

Canepa¹,

Nilberto²

2019

Preprint

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The recent growing attention to energy saving and environmental protection issues has brought to attention the possibility of exploiting syngas from gasification of biomass and coal for the firing of industrial plants included the so called Integrated Gasification Combined Cycle ones. In order to improve the knowledge about the employ of syngas in lean premixed turbulent flames, a large scale swirl stabilized gas-turbine burner has been operated with a simplified model of H2 enriched syngas from coal gasification. The experimental campaign has been performed at atmospheric pressure with operating conditions derived from scaling the real gas turbines ones. The results are here reported and consist of OH-PLIF measurements carried out at decreasing air equivalence ratio conditions and are analysed together with the mean aerodynamic characterisation of the burner flowfield in isothermal condition. The OH concentration distributions have been analysed statistically in order to obtain information about the location of the most reactive zones and an algorithm has been applied to the data in order to identify the flame fronts. In addition, the flame front locations have been successively interpreted statistically in order to obtain information about their main features and about their dependence on the air to fuel ratio behaviour.

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“…Hence, due to the previously described increased interest, extensive studies of turbulent and premixed air/syngas combustion processed have recently become a great interest to the research community. Unfortunately, due to the properties of the H 2 -rich fuels, most of the studies about syngas combustion are operated with diffusion flames, e.g., [10][11][12][13][14][15], while in general a lower number of studies are present concerning lean premixed combustion experiments, e.g., [16][17][18][19][20][21][22][23], which was carried out exploiting different diagnostic techniques, such as OH Laser-Induced Fluorescence and Rayleigh thermography. To the best of author's knowledge, such a lack of data is evident when considering turbulent flames in real scale gas turbine geometries.In such a scenario, the work presented here has been carried out employing a prototypical swirl stabilized real scale burner (500 kW power output in atmospheric operations), which implements the main current concepts of lean premixed combustors for gas turbine operations.…”

mentioning

confidence: 99%

Experimental Flame Front Characterisation in a Lean Premix Burner Operating with Syngas Simplified Model Fuel

Canepa

Nilberto

2019

Energies

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The recent growing attention to energy saving and environmental protection issues has brought attention to the possibility of exploiting syngas from gasification of biomass and coal for the firing of industrial plants included in the, so called, Integrated Gasification Combined Cycle power plants. In order to improve knowledge on the employ of syngas in lean premixed turbulent flames, a large scale swirl stabilized gas-turbine burner has been operated with a simplified model of H 2 enriched syngas from coal gasification. The experimental campaign has been performed at atmospheric pressure, with operating conditions derived from scaling the real gas turbines. The results are reported here and consist of OH-PLIF (OH Planar Laser Induced Fluorescence) measurements, carried out at decreasing equivalence of air/fuel ratio conditions and analysed together with the mean aerodynamic characterisation of the burner flow field in isothermal conditions obtained through LDV (Laser Doppler Velocimetry) and PIV (Particle Image Velocimetry) measurements. The OH concentration distributions have been analysed statistically in order to obtain information about the location of the most reactive zones, and an algorithm has been applied to the data in order to identify the flame fronts. In addition, the flame front locations have been successively interpreted statistically to obtain information about their main features and their dependence on the air to fuel ratio behaviour.to a standard diffusion flame. Unfortunately, such combustors are more susceptible to combustion instability and flashback [9]. If compared to natural gas, hydrogen-enriched syngas is characterized by a higher laminar burning velocity and higher mass diffusivity, which may lead to different interactions between the flow turbulence and the reaction chemistry in turbulent premixed flames, determining different flame characteristics from natural gas when employed in modern premixed-type combustors. Hence, due to the previously described increased interest, extensive studies of turbulent and premixed air/syngas combustion processed have recently become a great interest to the research community. Unfortunately, due to the properties of the H 2 -rich fuels, most of the studies about syngas combustion are operated with diffusion flames, e.g., [10][11][12][13][14][15], while in general a lower number of studies are present concerning lean premixed combustion experiments, e.g., [16][17][18][19][20][21][22][23], which was carried out exploiting different diagnostic techniques, such as OH Laser-Induced Fluorescence and Rayleigh thermography. To the best of author's knowledge, such a lack of data is evident when considering turbulent flames in real scale gas turbine geometries.In such a scenario, the work presented here has been carried out employing a prototypical swirl stabilized real scale burner (500 kW power output in atmospheric operations), which implements the main current concepts of lean premixed combustors for gas turbine operations. The burner has been tested whil...

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Quantitative OH Planar Laser Induced Fluorescence Diagnostics of Syngas and Methane Combustion in a Cavity Combustor

Cited by 14 publications

References 18 publications

Numerical and Experimental Studies on a Syngas-Fired Ultra Low NOx Combustor

Numerical and Experimental Studies on a Syngas-Fired Ultra Low NOx Combustor

Experimental Flame Front Characterisation in a Lean Premix Burner Operating with Syngas Simplified Model

Experimental Flame Front Characterisation in a Lean Premix Burner Operating with Syngas Simplified Model Fuel

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