Introduction to SPARK. Version 0.3

Morley, David N.

doi:10.21236/ada459669

Cited by 27 publications

(33 citation statements)

References 4 publications

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“…The compressed gas pressure is defined as the first local maximum on the pressure profile, and frozen chemistry was assumed during compression. The temperature calculation employed the adiabatic compression/expansion routine in Gaseq [44] which uses the temperature dependence of the ratio of specific heats, γ, according to:…”

Section: Rapid Compression Machinementioning

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

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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Section: Rapid Compression Machinementioning

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

397

279

View full text Add to dashboard Cite

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“…A silicone-coated pressure transducer (Kistler; 603B) was installed in the combustion chamber and pressure traces were recorded using a digital oscilloscope (Pico Technology; PicoScope 4244 PC Oscilloscope). The compressed gas temperature was calculated using Gaseq [33]. Figure 1 shows a typical pressure trace obtained from the NUIG rapid compression machine.…”

Section: Rapid Compression Machinementioning

confidence: 99%

“…A helium (99.99% pure; BOC) and nitrogen (99.99% pure; BOC) mixture were used as the driver gas, where the mixing ratio was chosen depending on the desired final shock pressure and test duration and varied from 75:25 to 100:0 (He:N 2 ). Six pressure transducers on the sidewall (PCB; 113A24) and one at the endwall (Kistler; 603B) were used to measure the velocity of the incident shock wave, which was used to calculate the temperature of the mixtures behind the reflected shock wave using the program Gaseq [33].…”

Section: Shock Tubementioning

confidence: 99%

An experimental and modeling study of shock tube and rapid compression machine ignition of n-butylbenzene/air mixtures

Nakamura

Darcy

Mehl

et al. 2014

Combustion and Flame

139

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“…A helium (99.99% pure; BOC Ireland) and nitrogen (99.99% pure; BOC Ireland) mixture were used as the driver gas, where the mixing ratio was varied from 90:10 to 100:0 (He:N 2 ) to obtain the reflected shock pressure of 30 atm and the desired test duration. Six pressure transducers on the sidewall (PCB; 113A24) and one at the endwall (Kistler; 603B) were used to measure the velocity of the incident shock wave, which was used to calculate the temperature of the mixtures behind the reflected shock wave using the program Gaseq [14]. Pressures behind the reflected shock wave were measured using the pressure …”

Section: Shock Tubementioning

confidence: 99%

“…Pressure traces were recorded using a digital oscilloscope. The compressed gas temperature was calculated using Gaseq [14]. Non-reactive experiments were performed in which oxygen was replaced by nitrogen in a mixture, in order to obtain pressure-time histories which are converted to volume-time histories which were used in chemical kinetic simulations to simulate the effects of compression and heat loss.…”

Section: Rapid Compression Machinementioning

confidence: 99%

An experimental and modeling study of diethyl carbonate oxidation

Nakamura

Curran

Córdoba

et al. 2015

Combustion and Flame

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Diethyl carbonate (DEC) is an attractive biofuel that can be used to displace petroleum-derived diesel fuel, thereby reducing CO 2 and particulate emissions from diesel engines. A better understanding of DEC combustion characteristics is needed to facilitate its use in internal combustion engines. Towards this goal, ignition delay times for DEC were measured at conditions relevant to internal combustion engines using a rapid compression machine (RCM) and a shock tube. The experimental conditions investigated covered a wide range of temperatures (660-1300 K), a pressure of 30 bar, and equivalence ratios of 0.5, 1.0 and 2.0 in air.To provide further understanding of the intermediates formed in DEC oxidation, species concentrations were measured in a jet-stirred reactor at 10 atm over a temperature range of 500-1200 K and at equivalence ratios of 0.5, 1.0 and 2.0. These experimental measurements were used to aid the development and validation of a chemical kinetic model for DEC.The experimental results for ignition in the RCM showed near negative temperature coefficient (NTC) behavior. Six-membered alkylperoxy radical (R 2 ) isomerizations are conventionally thought to initiate low-temperature branching reactions responsible for NTC behavior, but DEC has no such possible 6-and 7-membered ring isomerizations. However, its molecular structure allows for 5-, 8-and 9-membered ring R 2 isomerizations. To provide accurate rate constants for these ring structures, ab initio computations for R 2 QOOH isomerization reactions were performed. These new R 2 isomerization rate constants have been implemented in a chemical kinetic model for DEC oxidation. The model simulations have been compared with ignition delay times measured in the RCM near the NTC region. Results of the 3 simulation were also compared with experimental results for ignition in the high-temperature region and for species concentrations in the jet-stirred reactor. Chemical kinetic insights into the oxidation of DEC were made using these experimental and modeling results.

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Introduction to SPARK. Version 0.3

Cited by 27 publications

References 4 publications

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

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

An experimental and modeling study of shock tube and rapid compression machine ignition of n-butylbenzene/air mixtures

An experimental and modeling study of diethyl carbonate oxidation

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