Laminar flame speed measurements of dimethyl ether in air at pressures up to 10atm

Vries, J. de; Lowry, William; Serinyel, Zeynep; Curran, Henry J.; Petersen, Eric L.

doi:10.1016/j.fuel.2010.07.040

Cited by 92 publications

(52 citation statements)

References 24 publications

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“…The first vessel is aerospace-grade aluminum and has an internal diameter of 30,5 cm with optical access using two fused quartz windows about 20 cm in diameter. This vessel is the facility's original flame speed bomb, and more details about the vessel can be found in de Vries et al, [25] and Lowry et al, [26], The other vessel used in this study is a newly developed stainless steel vessel capable of performing experiments at initial temperatures up to 600 K and initial pressures up to 30 atm. The thick-walled vessel has an internal diameter of 31,8 cm and uses a similar optical access setup as the original flame speed facility which is discussed by Krejciet al, [27], A layout of the flame speed facility is shown in Fig, 1, Each vessel has its own thermocouple to monitor the initial gas mixture temperature.…”

Section: Experimental Methodsmentioning

confidence: 99%

Laminar Flame Speed and Ignition Delay Time Data for the Kinetic Modeling of Hydrogen and Syngas Fuel Blends

Krejci¹,

Mathieu²,

Vissotski³

et al. 2013

Journal of Engineering for Gas Turbines and Power

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205

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Laminar flame speeds and ignition delay times have been measured for hydrogen and various compositions ofH2lCO (syngas) at elevated pressures and elevated temperatures. Two constant-volume cylindrical vessels were used to visualize the spherical growth of the flame through the use of a schlieren optical setup to measure the laminar flame speed of the mixture. Hydrogen experiments were peiformed at initial pressures up to lOatm and initial temperatures up to 443 K. A syngas composition of 50150 by volume was chosen to demonstrate the effect of carbon monoxide on H2-O2 chemical kinetics at standard temperature and pressures up to lOatm. All atmospheric mixtures were diluted with standard air, while all elevated-pressure experiments were diluted with a He:02 ratio of 7:1 to minimize instabilities. The laminar flame speed measurements of hydrogen and syngas are compared to available literature data over a wide range of equivalence ratios, where good agreement can be seen with several data sets. Additionally, an improved chemical kinetics model is shown for all conditions within the current study. The model and the data presented herein agree well, which demonstrates the continual, improved accuracy of the chemical kinetics model. A high-pressure shock tube was used to measure ignition delay times for several baseline compositions of syngas at three pressures across a wide range of temperatures. The compositions of syngas (H2/CO) by volume presented in this study included 80/20, 50150, 40/60, 20/80, and 10/90, all of which are compared to previously published ignition delay times from a hydrogen-oxygen mixture to demonstrate the effect of carbon monoxide addition. Generally, an increase in carbon monoxide increases the ignition delay time, but there does seem to be a pressure dependency. At low temperatures and pressures higher than about 12 atm, the ignition delay times appear to be indistinguishable with an increase in carbon monoxide. However, at high temperatures the relative composition of H2 and CO has a strong influence on ignition delay times. Model agreement is good across the range of the study, particularly at the elevated pressures.

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Section: Experimental Methodsmentioning

confidence: 99%

Laminar Flame Speed and Ignition Delay Time Data for the Kinetic Modeling of Hydrogen and Syngas Fuel Blends

Krejci¹,

Mathieu²,

Vissotski³

et al. 2013

Journal of Engineering for Gas Turbines and Power

Self Cite

205

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“…Mixtures of methane and DME have also been studied within homogeneous charge compression ignition (HCCI) engines [10,11], where DME was found to be an excellent ignition improver. Several flame speed studies have been conducted on DME [12][13][14][15][16][17] using a variety of different methods such as constant-volume bomb using optical observation of the flame and counterflow flames; in some devices, particle im-age velocimetry has been utilized to determine the laminar flame speed from the observed gas velocities.…”

Section: Introductionmentioning

confidence: 99%

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Burke

Somers

O’Toole

et al. 2015

Combustion and Flame

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397

279

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The development of accurate chemical kinetic models capable of predicting the combustion of methane and dimethyl ether in common combustion environments such as compression ignition engines and gas turbines is important as it provides valuable data and understanding of these fuels under conditions that are difficult and expensive to study in the real combustors. In this work, both experimental and chemical kinetic model-predicted ignition delay time data are provided covering a range of conditions relevant to gas turbine environments (T = 600 − 1600 K, p = 7 − 41 atm, φ = 0.3, 0.5, 1.0, and 2.0 in 'air' mixtures). The detailed chemical kinetic model (Mech 56.54) is capable of accurately predicting this wide range of data, and it is the first mechanism to incorporate high-level rate constant measurements and calculations where available for the reactions of DME. This mechanism is also the first to apply a pressure-dependent treatment to the low-temperature reactions of DME. It has been validated using available literature data including flow reactor, jet-stirred reactor, shock-tube ignition delay times, shock-tube speciation, flame speed, and flame speciation data. New ignition delay time measurements are presented for methane, dimethyl ether, and their mixtures; these data were obtained using three different shock tubes and a rapid compression machine. In addition to the DME/CH 4 blends, high-pressure data for pure DME and pure methane were also obtained. Where possible, the new * address:

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“…Regarding pressure dependence, it has been shown that the laminar burning velocity decreases to about half when the pressure is changed an order of magnitude. At standard conditions there is satisfactory agreement (Daly et al 2001;Qin and Ju 2005;Wang et al 2009a, b;de Vries et al 2011), Leplat and Vandooren (2012) especially at the lean side. The maximum in laminar burning velocity is about 45 cm/s between equivalence ratios 1.1-1.2 (Tables 10.18, 10.19).…”

Section: Dimethyl Ethermentioning

confidence: 62%

Flame Studies of Oxygenates

Nilsson

Konnov

2013

Cleaner Combustion

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This chapter presents a comprehensive review of flame studies performed on oxygenated hydrocarbons or oxygenates of general formula C x H y O z . In particular those studies in which the authors have measured laminar flame speeds or have concentrated on speciation in flames. It is the first time that such tabulation is performed and summarizes the work carried out since the 1950s. In addition, the methods employed in determining flame speeds are outlined and their strengths and weaknesses highlighted. In a similar fashion the various diagnostic methods for measuring species concentrations in situ are reviewed. were focused on extension of the list of detectible species and on the achievements in quantitative measurements. In most cases, spectroscopic techniques were tested in flames of methane and other conventional fuels, yet flames of oxygenated species were also visited (Desgroux et al. 1994). 240

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Laminar flame speed measurements of dimethyl ether in air at pressures up to 10atm

Cited by 92 publications

References 24 publications

Laminar Flame Speed and Ignition Delay Time Data for the Kinetic Modeling of Hydrogen and Syngas Fuel Blends

Laminar Flame Speed and Ignition Delay Time Data for the Kinetic Modeling of Hydrogen and Syngas Fuel Blends

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Flame Studies of Oxygenates

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