Modeling of Auto-Ignition and Combustion Processes for Dual-Component Fuel Spray

2011 ◽  
Vol 4 (2) ◽  
pp. 2193-2206 ◽  
Author(s):  
Yoshimitsu Kobashi ◽  
Kenta Fujimori ◽  
Hiroki Maekawa ◽  
Satoshi Kato ◽  
Daisuke Kawano ◽  
...  
Keyword(s):  
Fuel Spray ◽  
Auto Ignition ◽  
Ignition And Combustion ◽  
Combustion Processes

Comparative Study on Spray Auto-Ignition of Di-n-Butyl Ether and Diesel Blends at Engine-Like Conditions

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Yuanhang Guan ◽  
Wang Liu ◽  
Dong Han
Keyword(s):  
Heat Release ◽  
Oxygen Concentration ◽  
Pressure Rise ◽  
Fuel Spray ◽  
Release Rates ◽  
Butyl Ether ◽  
Auto Ignition ◽  
Ambient Oxygen ◽  
Ignition And Combustion ◽  
Oxygen Concentrations

Abstract Di-n-butyl ether (DBE), a promising lignocellulosic biofuel, has been suggested as a potential alternative fuel for compression ignition engines. In this study, the spray auto-ignition characteristics of diesel/DBE blends were experimentally measured on a constant volume combustion chamber. Time-resolved pressure traces and heat release rates in fuel spray combustion were measured at changed fuel blending fractions, ambient temperatures, and oxygen concentrations. Further, ignition delay and combustion delay that evaluates fuel spray ignition tendency were derived and compared for different test blends. Experimental results indicated that fuel spray ignition tendency is promoted with DBE addition, evidenced by the advanced pressure rise and heat release processes, and the shortened ignition and combustion delays. Peak heat release rates are fuel-dependent at high ambient oxygen concentrations since the relative fractions of the premixed and diffusive burns alter with changed DBE addition. However, as the oxygen concentration drops to 11%, fuel effects on the peak heat release rates become less noticeable. Reduced ambient oxygen concentration effectively extends fuel ignition and combustion delays, and typical two-stage pressure rises and heat releases are observed for all test blends, as the oxygen concentration drops to 11%.

scholarly journals Ignition of Slurry Fuel Droplets with Different Heating Conditions

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4553
Author(s):  
Timur Valiullin ◽  
Ksenia Vershinina ◽  
Pavel Strizhak
Keyword(s):  
Heat Fluxes ◽  
Radiative Heating ◽  
Convective Heating ◽  
Radiation Heating ◽  
Fuel Droplets ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Ignition And Combustion ◽  
Combustion Processes ◽  
Hot Surface

This paper describes modern research methods of the ignition and combustion processes of slurry fuel droplets. The experiments were carried out using a muffle furnace to ensure the conditions of radiation heating, the hot surface to reproduce the conditions of conductive heating, the high-temperature channel with convective heating, the chamber with the processes of soaring, i.e., a significant increase in the time of fuel residence in the combustion chamber. We identified the differences in combustion modes, threshold ignition temperatures, delay times and durations of combustion processes. We obtained the quantitative differences in the characteristics of the ignition and combustion processes for typical registration methods. It was found that for all heating schemes, the minimum ignition temperatures have comparable values. Minimum ignition delay times were recorded during convective heating. The maximum combustion temperatures were achieved with radiation heating. We determined the values of limiting heat fluxes, sufficient to initiate the combustion of slurries fuels during conductive, convective and radiative heating.

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