Shock tube studies on ignition delay and combustion characteristics of oxygenated fuels under high temperature

2020 ◽  
Vol 44 (13) ◽  
pp. 10101-10111 ◽  
Author(s):  
Zhihao Ma ◽  
Weixin Du ◽  
Xin Wang ◽  
Enyu Lv ◽  
Yongchao Dong
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
Ignition Delay ◽  
Combustion Characteristics ◽  
Oxygenated Fuels

The Shock Tube Autoignition of Biodiesels and Biodiesel Components

2013 ◽  
Author(s):  
Weijing Wang ◽  
Matthew A. Oehlschlaeger
Keyword(s):  
High Temperature ◽  
Methyl Ester ◽  
Shock Tube ◽  
Ignition Delay ◽  
Methyl Esters ◽  
Acid Methyl Ester ◽  
Oh Radicals ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

The autoignition of fatty-acid methyl ester biodiesels and methyl ester biodiesel components was studied in gas-phase shock tube experiments. Ignition delay times for two reference methyl ester biodiesel fuels, derived from methanol-based transesterification of soybean oil and animal fats, and four primary constituents of all methyl ester biodiesels, methyl palmitate, methyl stearate, methyl oleate, and methyl linoleate, were measured behind reflected shock waves for fuel/air mixtures at temperatures ranging from 900 to 1350 K and at pressures around 10 and 20 atm. Ignition delay times were determined by monitoring pressure and chemiluminescence from electronically-excited OH radicals around 310 nm. The results show similarity in ignition delay times for all methyl ester fuels considered, irrespective of the variations in organic structure, at the high-temperature conditions studied and also similarity in high-temperature ignition delay times for methyl esters and n-alkanes.

Understanding the Effect of Oxygenated Biofuels Addition on Combustion Characteristics of Gasoline

2018 ◽  
Author(s):  
Shrabanti Roy ◽  
Saeid Zare ◽  
Omid Askari
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Equivalence Ratio ◽  
Ignition Delay Time ◽  
Combustion Characteristics ◽  
Wide Range ◽  
Oxygenated Fuels ◽  
Laminar Burning Speed

The change in laminar burning speed and ignition delay time of iso-octane with the addition of oxygenated fuels are investigated. As oxygenated fuels, ethanol and 2,5 dimethyle furan (DMF) are used. To confirm the process and mechanism a detailed validation is done on laminar burning speed and ignition delay time. Further, three different blending ratios of 5%, 25% and 50% for both ethanol/iso-octane and DMF/iso-octane are investigated separately. Wide range of equivalence ratio from 0.6–1.4 is considered in calculating laminar burning speed. Ignition delay time is measured under various temperatures from 650 K to 1100 K. Results of each blending are compared with the pure fuels. A comparison is also done between the effects of these two oxygenates. It has found that for each blending case presence of DMF brings larger change in the behavior of iso-octane than ethanol. This observation refers to further study on comparison of these two oxygenates.

scholarly journals Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions

2020 ◽  
Vol 10 (16) ◽  
pp. 5460
Author(s):  
José V. Pastor ◽  
José M. García-Oliver ◽  
Carlos Micó ◽  
Alba A. García-Carrero ◽  
Arantzazu Gómez
Keyword(s):  
Vegetable Oil ◽  
Diesel Fuel ◽  
Ignition Delay ◽  
Soot Formation ◽  
Imaging Techniques ◽  
Detection Threshold ◽  
Combustion Characteristics ◽  
Engine Combustion ◽  
Lift Off ◽  
Oxygenated Fuels

The stringent emission regulations have motivated the development of cleaner fuels as diesel surrogates. However, their different physical-chemical properties make the study of their behavior in compression ignition engines essential. In this sense, optical techniques are a very effective tool for determining the spray evolution and combustion characteristics occurring in the combustion chamber. In this work, quantitative parameters describing the evolution of diesel-like sprays such as liquid length, spray penetration, ignition delay, lift-off length and flame penetration as well as the soot formation were tested in a constant high pressure and high temperature installation using schlieren, OH∗ chemiluminescence and diffused back-illumination extinction imaging techniques. Boundary conditions such as rail pressure, chamber density and temperature were defined using guidelines from the Engine Combustion Network (ECN). Two paraffinic fuels (dodecane and a renewable hydrotreated vegetable oil (HVO)) and two oxygenated fuels (methylal identified as OME1 and a blend of oxymethylene ethers, identified as OMEx) were tested and compared to a conventional diesel fuel used as reference. Results showed that paraffinic fuels and OMEx sprays have similar behavior in terms of global combustion metrics. In the case of OME1, a shorter liquid length, but longer ignition delay time and flame lift-off length were observed. However, in terms of soot formation, a big difference between paraffinic and oxygenated fuels could be appreciated. While paraffinic fuels did not show any significant decrease of soot formation when compared to diesel fuel, soot formed by OME1 and OMEx was below the detection threshold in all tested conditions.

scholarly journals The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1963 ◽  
Author(s):  
Jonghan Won ◽  
Seung Wook Baek ◽  
Hyemin Kim ◽  
Hookyung Lee
Keyword(s):  
High Temperature ◽  
Burning Rate ◽  
Diesel Fuel ◽  
Ignition Delay ◽  
Environmental Problem ◽  
Mixing Time ◽  
Environmental Problems ◽  
Combustion Characteristics ◽  
Emulsion Droplet ◽  
Single Droplet

Diesel fuel exhibits excellent combustion characteristics and stability. However, diesel use is becoming restricted because of its associated environmental problems. Fuel emulsification, which increases efficiency and reduces pollution, became the solution of environmental problem. In this study, five water:diesel emulsions with mass ratios (0.3, 0.6, 1.0, 1.2, and 1.5) via ultrasonication were synthesized with and without surfactant. The optimal water:diesel ratio (=1:1) of an emulsion containing the surfactant was found by analyzing fuel concentration, mixing time, and viscosity. The combustion characteristics of single-droplet optimal emulsions were studied through ignition delay, burning rate, and total droplet lifetime at high temperature (400–700 °C) and pressure (1–15 bar), and micro-explosion phenomenon was observed. Although the ignition delay of emulsion increased, the total lifetime of the emulsion droplet was lower than that of diesel under 5 bar, 600 °C condition.

High-temperature DMMP combustion measurements in a shock tube using laser absorption spectroscopy

2020 ◽  
Author(s):  
Ramees Rahman ◽  
Sneha Neupane ◽  
Jessica Baker ◽  
Erik M. Ninnemann ◽  
Farhan Arafin ◽  
...  
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
Absorption Spectroscopy ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption
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