scholarly journals Ignition of liquid droplets fuels under conditions of radiation-conductive heating in air

2018 ◽  
Vol 194 ◽  
pp. 01062
Author(s):  
Arkadiy V. Zakharevich ◽  
Mikhail S. Zygin ◽  
Dmitriy N. Tsymbalov
Keyword(s):  
Experimental Investigation ◽  
Diesel Fuel ◽  
Ignition Delay ◽  
Delay Time ◽  
Liquid Fuel ◽  
Ignition Delay Time ◽  
Initial Temperature ◽  
Liquid Droplets ◽  
Conductive Heating ◽  
Fuel Droplets

The results of an experimental investigation of ignition liquid fuel (kerosene, diesel fuel) by the single drops under conditions of radiation-conducting heating in air are presented. The dependences of the ignition delay time of the typical fuels droplets on the initial temperature of the heated oxidant in a limited space are established. The parameters of stable ignition of liquid fuel droplets are set.

scholarly journals Experimental Investigations on the Ignition Delay Time of Freely Falling Liquid Fuel Droplets

2021 ◽  
Vol 39 (3) ◽  
pp. 987-991
Author(s):  
Narayan P. Sapkal
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Ignition Temperature ◽  
Liquid Fuel ◽  
Ignition Delay Time ◽  
High Viscosity ◽  
Carbon Residue ◽  
Fuel Droplets ◽  
Low Viscosity ◽  
System Temperature

The ignition delays of freely falling liquid fuel droplets in a high-temperature environment were determined experimentally as a function of the surrounding parameters and droplet composition. Two different groups of fuels have been categorized based on the viscosity and volatility of each fuel. In the first group, for diesel and kerosene, the ignition delay time decreases with increasing system temperature due to low viscosity and thereby high volatile nature of fuels. Whereas, in the second group, C-heavy oil and blended renewable fuel shows an increase in the ignition delay time with increasing the system temperature and thereby shows the negative temperature coefficient (NTC) behavior due to high viscosity and low volatile characteristics of those fuels. In the case of low viscosity carbon residue fuels with low ignition temperature, they may vaporize early and decrease in the ignition delay time. But for high viscosity carbon residue fuels and with high ignition temperature, it may prolong the vaporization time and thereby physical delay. Evidently, the physical parameters and therefore the physical delay are the predominant factors in the NTC behavior of such high hydrocarbon liquid fuel droplets.

Auto-ignition characteristics of diesel fuel in an O2–CO2 mixture

2019 ◽  
Vol 43 (1) ◽  
pp. 1-12
Author(s):  
Yongfeng Liu ◽  
Tianpeng Zhao ◽  
Zhijun Li ◽  
Fang Wang ◽  
Shengzhuo Yao ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Flame Temperature ◽  
Zone Model ◽  
Auto Ignition ◽  
Lift Off ◽  
Ignition Characteristics ◽  
Set Up

To study diesel fuel auto-ignition in an O2–CO2 mixture, a TZ (temperature zone) model is proposed. The effect of O2 and CO2 on reaction rate is considered. The relationship between temperature and ignition delay time is obtained. Different reduced mechanisms based on steady-state assumptions are applied in three temperature zones (T ≤ 800 K, 800 K < T ≤ 1100 K, T > 1100 K). The TZ model is coupled to KIVA-3V code for simulation calculations. To support the simulations, a constant-volume combustion bomb test bench is set up to visualize diesel fuel auto-ignition in air (21%O2–79%N2), a 53%O2–47%CO2 mixture, and a 61%O2–39%CO2 mixture. Ignition delay time and the flame image in these three conditions are compared and analyzed. Then the flame temperature contour and the flame lift-off length in a 53%O2–47%CO2 mixture and a 61%O2–39%CO2 mixture are analyzed. The results show that diesel fuel auto-ignition can be achieved in the tested O2–CO2 mixture. The TZ model can predict the auto-ignition characteristics of diesel fuel in a 53%O2–47%CO2 mixture and a 61%O2–39%CO2, with errors of 12% and 10%, respectively. In these two conditions, the ignition delay time and flame lift-off length are shorter than they are in air.

Paper 41: The Spontaneous Ignition and Ignition Delay of Liquid Fuel Droplets Impinging on a Hot Surface

1967 ◽  
Vol 182 (8) ◽  
pp. 382-392 ◽  
Author(s):  
S. Satcunanathan ◽  
B. J. Zaczek
Keyword(s):  
Diesel Fuel ◽  
Ignition Delay ◽  
Liquid Fuel ◽  
Spontaneous Ignition ◽  
Temperature Range ◽  
Fuel Droplets ◽  
Minimum Value ◽  
Commercially Important ◽  
Hot Surface

The spontaneous ignition and ignition delays of liquid fuel droplets impinging on a hot surface are investigated. It is shown that the ignition delay–temperature curves follow closely the pattern of lifetime–temperature curves and that for the commercially important fuels, such as kerosine and diesel fuel, the ignition delays have a minimum value at some particular temperature. Zones of non-ignition are isolated and a hypothesis presented for their occurrence. It is further shown that within the temperature range investigated, the ignition delays of droplets impinging on a hot surface are much shorter than those of similar droplets undergoing spontaneous ignition when suspended in a stagnant atmosphere.

THERMAL BEHAVIOR AND IGNITION OF HIGH-ENERGY MATERIALS CONTAINING B, ALB2, AND TIB2

2020 ◽  
Author(s):  
A. G. Korotkikh ◽  
◽  
V. A. Arkhipov ◽  
I. V. Sorokin ◽  
E. A. Selikhova ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Flux Density ◽  
Ignition Delay ◽  
Delay Time ◽  
Heat Flux Density ◽  
Ignition Delay Time ◽  
High Energy ◽  
Energy Materials ◽  
High Energy Materials

The paper presents the results of ignition and thermal behavior for samples of high-energy materials (HEM) based on ammonium perchlorate (AP) and ammonium nitrate (AN), active binder and powders of Al, B, AlB2, and TiB2. A CO2 laser with a heat flux density range of 90-200 W/cm2 was used for studies of ignition. The activation energy and characteristics of ignition for the HEM samples were determined. Also, the ignition delay time and the surface temperature of the reaction layer during the heating and ignition for the HEM samples were determined. It was found that the complete replacement of micron-sized aluminum powder by amorphous boron in a HEM sample leads to a considerable decrease in the ignition delay time by a factor of 2.2-2.8 at the same heat flux density due to high chemical activity and the difference in the oxidation mechanisms of boron particles. The use of aluminum diboride in a HEM sample allows one to reduce the ignition delay time of a HEM sample by a factor of 1.7-2.2. The quasi-stationary ignition temperature is the same for the AlB2-based and AlB12-based HEM samples.

Low-Temperature Hypergolic Ignition of 1-Octene with Low Ignition Delay Time

2020 ◽  
Author(s):  
Haoqiang Sheng ◽  
Xiaobin Huang ◽  
Zhijia Chen ◽  
Zhengchuang Zhao ◽  
Hong Liu
Keyword(s):  
Low Temperature ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time
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