Experimental and numerical study on ethanol and dimethyl ether lifted flames in a hot vitiated co-flow

Wu, Zhijun; Zhang, Qing; Bao, Tangtang; Li, Liguang; Deng, Jun; Hu, Zongjie

doi:10.1016/j.fuel.2016.07.064

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…In the experiments of measuring JHC flames, − the liquid fuel was either sprayed to dispersed droplets by an atomizer/nebulizer − or prevaporized directly by heating. − Note that the JHC spray flame is similar to that from most of the practical devices; however, the prevaporized case skips several typical pre-processes of liquid fuel combustion, e.g., atomization, droplet breakup, and evaporation. Apparently, the prevaporized case is analogous to the JHC gaseous flame.…”

Section: Open Jet Flame Of Liquid Fuel In Hot Oxidizer Coflowmentioning

confidence: 73%

“…Later, a great number of investigators or teams, including Oldenhof et al, , used a similar JHC burner to characterize the ignition process of burning gaseous CH 4 or CH 4 /H 2 under MILD conditions. For liquid fuels, the JHC flames have also been examined and measured at the Indian Institute of Technology, Delft University, , and Adelaide University. − Table summarizes the conditions of JHC flames of different liquid fuels for the previous experiments. − …”

Section: Open Jet Flame Of Liquid Fuel In Hot Oxidizer Coflowmentioning

confidence: 99%

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Moderate and Intense Low-Oxygen Dilution (MILD) Combustion of Liquid Fuels: A Review

Wang

et al. 2022

Energy Fuels

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In the past 3 decades or so, the innovative combustion technologies associated with so-called “moderate and intense low-oxygen dilution (MILD) combustion” have been researched and developed to help mitigate greenhouse gases and harmful pollutants from burning fossil fuels. The MILD combustion is characterized by ultra-low emissions of nitric oxides (NO x ) and carbon monoxides, uniform temperature and large reaction zone, invisibility and silence, and broadly usable fuels. Currently, it has been successfully used in steel and metallurgy industries worldwide, offering a high thermal efficiency and ultra-low NO x emissions. It also has a high potential to apply in the power generation industries, such as gas turbines, most of which fire liquid fuels. However, this type of combustion for burning liquid fuels has not been well-understood, thus requiring further research and development (R&D). To facilitate the R&D, the present review is undertaken on the past progress made in research into the liquid fuel MILD combustion. Specifically, it summarizes the findings from the previous studies of both open fuel jet flames in hot coflow and enclosed furnace combustion of liquid fuels. Likewise, it analyzes the combustion characteristics of burning liquid fuels and evaluates the challenges in operating with different liquid fuel types. The review is concluded by suggesting some future research directions for the combustion itself, the computational fluid dynamics modeling, and the comprehensive design methods of its applications.

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Section: Open Jet Flame Of Liquid Fuel In Hot Oxidizer Coflowmentioning

confidence: 73%

Section: Open Jet Flame Of Liquid Fuel In Hot Oxidizer Coflowmentioning

confidence: 99%

Moderate and Intense Low-Oxygen Dilution (MILD) Combustion of Liquid Fuels: A Review

Wang

et al. 2022

Energy Fuels

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“…Many experiments studying H 2 /N 2 and CH 4 /air lifted flames have been performed in a hot vitiated co-flow burner. − The flame temperature distribution, ignition delay, lift-off height, important species, and time-resolved parameters of the lifted flame are investigated in these experiments. Different numerical simulations were conducted on the basis of the results of these experimental data. − Various models (e.g., Reynolds-averaged Navier–Stokes, large eddy simulation for flow, probability density function, and conditional moment closure for combustion) and direct numerical simulation are employed.…”

Section: Introductionmentioning

confidence: 99%

Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

Zhang

et al. 2016

Energy Fuels

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Turbulent lifted flames of diesel–propane blend fuels issuing into a vitiated co-flow are recorded with a high-speed camera. The spray characteristics, flame structures, ignition delays, and lift-off heights of jet flames of diesel–propane blend fuels are analyzed in this research. As an additive to diesel fuel, propane has little influence on the autoignition process of diesel from the perspective of chemical kinetics but it improves the atomization, evaporation, and turbulence of the fuel spray. The addition of propane is beneficial for studying the interaction of the chemical kinetics and fluid dynamics in turbulent lifted flames. The experimental results show that the propane fraction has different influences on the ignition delay in two temperature ranges. The ignition delay increases with the increase of the fraction of propane when the co-flow temperature is lower than 1080 K and decreases when the co-flow temperature is higher than 1117 K. Thus, a related mechanism controlling the ignition delay of the blends is proposed by combining the physical preparation process and chemical preparation process. A zero-dimensional model based on chemical kinetics supports this conclusion. For flame stabilization, a higher fraction of propane results in a higher lift-off height in the temperature range of 1043–1098 K, a lower lift-off height in the temperature range of 1117–1155 K, and a higher lift-off height in the temperature range of 1175–1194 K. A mechanism for stabilizing lifted flames from liquid blend fuels is proposed from the perspective of autoignition and turbulence.

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A Review on Autoignition in Laminar and Turbulent Nonpremixed Flames

Ghai

2017

Combustion for Power Generation and Transportation

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Experimental and numerical study on ethanol and dimethyl ether lifted flames in a hot vitiated co-flow

Cited by 6 publications

References 37 publications

Moderate and Intense Low-Oxygen Dilution (MILD) Combustion of Liquid Fuels: A Review

Moderate and Intense Low-Oxygen Dilution (MILD) Combustion of Liquid Fuels: A Review

Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

A Review on Autoignition in Laminar and Turbulent Nonpremixed Flames

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