Author:
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Category : Fuel
Languages : en
Pages :

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Author: K. P. Rickson
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Category :
Languages : en
Pages :

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Author: Peter A. Soriano
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ISBN:
Category : Chemical equilibrium
Languages : en
Pages : 208

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Author: Richard Boyd Morrison
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ISBN:
Category : Combustion
Languages : en
Pages : 144

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Author: Andrew R. Laich
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ISBN:
Category :
Languages : en
Pages : 89

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Over the years methane and natural gas (NG) as a fuel have become an important source of energy in the power generation and transportation sectors, with the latter most prominently adopting propane used in public transportation shuttles. Notable interest in using liquid methane or NG fueled rocket engines has recently gained traction and are currently in development/production at SpaceX (raptor engine, full-flow staged combustion cycle) and Blue Origin (BE-4, staged combustion cycle). Given the variety of applications, sourcing and refinement of methane/NG may be completely different to ensure a certain purity is met, especially in an advanced rocket engine cycle, like the raptor engine, that may be highly sensitive to minor fuel variances.

Author: Raymond Paul Cornish
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Category :
Languages : en
Pages :

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Author: Brian Christopher Walker
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Category :
Languages : en
Pages : 98

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The combustion behavior of methane and ethane is important to the study of natural gas and other alternative fuels that are comprised primarily of these two basic hydrocarbons. Understanding the transition from methane-dominated ignition kinetics to ethane-dominated kinetics for increasing levels of ethane is also of fundamental interest toward the understanding of hydrocarbon chemical kinetics. Much research has been conducted on the two fuels individually, but experimental data of the combustion of blends of methane and ethane is limited to ratios that recreate typical natural gas compositions (up to ~20% ethane molar concentration). The goal of this study was to provide a comprehensive data set of ignition delay times of the combustion of blends of methane and ethane at near atmospheric pressure.

Author: R. Keiper
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Category :
Languages : en
Pages : 9

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Methane-Air mixture in Argon heat bath is ignited by shock, reflected from the endwall of shock tube. Experiments are compared with numerical prediction based on Bowman's reaction scheme including Zel'dovich mechanism. Agreement between experimental density profiles and numerical prediction is very good. Methane absorption outside the boundary layer agrees well with computation based on isobaric combustion. Measurements in the boundary layer, albeit with insufficient space resolution, are in accord with the predicted trends.

Author: Shaye Yungster
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ISBN:
Category : Detonation waves
Languages : en
Pages : 18

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Author: Samuel Evan Barak
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Category :
Languages : en
Pages : 157

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Supercritical carbon dioxide (sCO2) cycles are being investigated for the future of power generation. These cycles will contribute to a carbon-neutral future to combat the effects of climate change. These direct-fired closed cycles will produce power without adding significant pollutants to the atmosphere. For these cycles to be efficient, they will need to operate at significantly higher pressures (e.g., 300 atm for Allam Cycle) than existing systems (typically less than 40 atm). There is limited knowledge on combustion at these pressures or at the high dilution of carbon dioxide. Nominal fuel choices for gas turbines include natural gas and syngas (mixture of CO and H2). Shock tubes study these problems in order to understand the fundamentals and solve various challenges. Shock tube experiments have been studied by the author in the sCO2 regime for various fuels including natural gas, methane and syngas. Using the shock tube to take measurements, pressure and light emissions time-histories measurements were taken at a 2-cm axial location away from the end wall. Experiments for syngas at lower pressure utilized high-speed imaging through the end wall to investigate the effects of bifurcation. It was found that carbon dioxide created unique interactions with the shock tube compared to tradition bath gasses such as argon. The experimental results were compared to predictions from leading chemical kinetic mechanisms. In general, mechanisms can predict the experimental data for methane and other hydrocarbon fuels; however, the models overpredict for syngas mixtures. Reaction pathway analysis was evaluated to determine where the models need improvements. A new shock tube has been designed and built to operate up to 1000 atm pressures for future high-pressure experiments. Details of this new facility are included in this work. The experiments in this work are necessary for mechanism development to design an efficient combustor operate these cycles.