Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Albin, Eric; Nawroth, Holger; Göke, Sebastian; D'Angelo, Yves; Paschereit, Christian Oliver

doi:10.1016/j.fuproc.2012.06.027

Cited by 38 publications

(21 citation statements)

References 20 publications

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“…Table 1 gives an overview of the investigated combustor operating conditions. The inlet temperature T in as well as the adiabatic flame temperature T ad were calculated using CANTERA and the GRI 3.0 mechanism (Smith et al, 2000), which was shown to reasonably perform even at high steam-dilution rates (Albin et al, 2013). Subsequently, the temperature of the burnt gases T fl was estimated using an empirical correlation .…”

Section: Combustion Test Rigmentioning

confidence: 99%

Impact of Steam-Dilution on the Flame Shape and Coherent Structures in Swirl-Stabilized Combustors

Steffen

Oberleithner

Paschereit

2014

Combustion Science and Technology

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Humidified gas turbines and steam-injected gas turbines are promising technologies to lower the emissions and increase the efficiency and fuel flexibility of gas turbines. In the current study, the influence of steam-dilution on swirl-stabilized methane and hydrogenfired flames is experimentally investigated at Reynolds numbers in the range of 22,000 to 32,000. Velocity fields and flame positions were measured using high-speed particle image velocimetry and OH * chemiluminescence. An extension of the quantitative light sheet technique was employed to estimate the temperature fields. The combined results reveal strong changes in the flame position, the velocity field, and the temperature field with increasing rates of steam dilution. In particular, three different flow and flame patterns are encountered: At dry conditions, a V-shaped flame stabilizes in a broad inner recirculation zone with low local turbulent kinetic energy; at moderate steam content, the flame changes into a trumpet-like shape; and at very high rates of steam-dilution, the flame detaches and shows an annular shape. The associated coherent flow structures are extracted from the particle image velocimetry data employing proper orthogonal decomposition. The isothermal flow is dominated by a helical instability arising near the combustor inlet. This structure is completely suppressed for the dry flame and reappears for the heavily steam-diluted detached flame with a similar shape and frequency as for the isothermal case. The flow field of the trumpet-like flame at intermediate to high steam dilution rates features a helical instability of lower frequency that is located further downstream than in the isothermal and very wet case. A conceptional explanation is presented that relates the suppression of the helical instability to the specific encountered temperature fields and flame shapes.

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Section: Combustion Test Rigmentioning

confidence: 99%

Impact of Steam-Dilution on the Flame Shape and Coherent Structures in Swirl-Stabilized Combustors

Steffen

Oberleithner

Paschereit

2014

Combustion Science and Technology

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“…There have been a number of studies on the impact of H 2 O on the burning velocity of CH 4 [22][23][24][25]. While all three tested mechanisms can predict the decrease of the burning velocity through H 2 O addition equally well at atmospheric pressure, AramcoMech 1.3 performs better at elevated pressure (see Fig.…”

Section: Mechanism For Oxy-fuel Combustion Of Chmentioning

confidence: 97%

Chemical kinetics mechanism for oxy-fuel combustion of mixtures of hydrogen sulfide and methane

Bongartz

Ghoniem

2015

Combustion and Flame

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Oxy-fuel combustion of sour gas, a mixture of natural gas (essentially methane (CH 4 )), carbon dioxide (CO 2 ), and hydrogen sulfide (H 2 S), could enable the utilization of large natural gas resources, especially when combined with enhanced oil recovery. In this work, a detailed chemical reaction mechanism for oxy-fuel combustion of sour gas is presented. To construct the mechanism, a CH 4 sub-mechanism was chosen based on a comparative validation study for oxy-fuel combustion. This mechanism was combined with a mechanism for H 2 S oxidation, and the sulfur sub-mechanism was then optimized to give better agreement with relevant experiments. The optimization targets included predictions for the laminar burning velocity, ignition delay time, and pyrolysis of H 2 S, and H 2 S oxidation in a flow reactor. The rate parameters of 15 sulfur reactions were varied in the optimization within their respective uncertainties. The optimized combined mechanism was validated against a larger set of experimental data over a wide range of conditions for oxidation of H 2 S and interactions between carbon and sulfur species. Improved overall agreement was achieved through the optimization and all important trends were captured in the modeling results. The optimized mechanism can be used to make qualitative and some quantitative predictions on the combustion behavior of sour gas. The remaining discrepancies highlight the current uncertainties in sulfur chemistry and underline the need for more accurate direct determination of several important rate constants as well as more validation data.

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“…Stratified charge engines and large gas engines use lean combustion to achieve these objectives [2,3], resulting in longer combustion durations and lower power density of the engine. To avoid efficiency losses, the grade of turbulence and the boost pressure can be increased [4]. These measures increase the demands for the ignition system [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser

et al. 2016

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Miniaturized passively q-switched laser ignition systems are a promising alternative to conventional ignition sources to ensure a reliable ignition under difficult conditions. In this study the influences of focal point properties on energy transfer from laser to plasma as well as plasma formation and propagation are investigated as the first steps of the laser induced ignition process. Maximum fluence and fluence volume are introduced to characterize focal point properties for varying laser pulse energies and focusing configurations. The results show that the transferred laser energy increases with increasing maximum fluence. During laser emission plasma propagates along the beam path of the focused laser beam. Rising maximum fluence results in increased plasma volume, but expansion saturates when fluence volume reaches its maximum.

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Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Cited by 38 publications

References 20 publications

Impact of Steam-Dilution on the Flame Shape and Coherent Structures in Swirl-Stabilized Combustors

Impact of Steam-Dilution on the Flame Shape and Coherent Structures in Swirl-Stabilized Combustors

Chemical kinetics mechanism for oxy-fuel combustion of mixtures of hydrogen sulfide and methane

Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser

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