Effect of Additives on the Cetane Ratings of Diesel Fuels as Related to the Ignition Delays of Liquid Fuel Droplets Impinging on a Hot Surface

1972 ◽  
Vol 186 (1) ◽  
pp. 317-321 ◽  
Author(s):  
S. Satcunanathan ◽  
M. S. El Nesr
Keyword(s):  
Ignition Delay ◽  
Liquid Fuel ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Effect Of Additives ◽  
Hot Surface

Results of an investigation show that the effects of additives on the ignition delays of liquid fuel droplets impinging on a hot surface correlate satisfactorily with their effects on the cetane ratings of diesel fuels. It is also shown that additives for diesel fuels may be divided into three categories according to their effects on the above mentioned ignition delays, viz. (1) those that reduce the ignition delay at all dosages, (2) those that reduce the ignition delay at small dosages but increase it at high dosage and (3) those that do not have any significant effect on the ignition delay.

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.

Evaporation Time of Gasoline and Diesel Fuel Droplets on a Hot Plate: The Influence of Fuel Deposits

2008 ◽  
Author(s):  
P. Seers ◽  
V. Reguillet ◽  
E. Plamondon ◽  
L. Dufresne ◽  
S. Halle´
Keyword(s):  
Diesel Fuel ◽  
Droplet Evaporation ◽  
Evaporation Time ◽  
Plate Temperature ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Initial Fuel ◽  
Property Changes ◽  
Fuel Evaporation ◽  
Hot Surface

The objective of this paper is to present experimental results of multicomponent fuel droplets impinging on a hot surface in order to quantify the influence of fuel build-up deposits on the evaporation time. The experiments were conducted with gasoline and diesel fuels to first obtain curves of evaporation time as a function of plate temperature. Based on these curves the Nukiyama and Leindenfrost temperatures were identified. In a second step, the effect of fuel deposit on the droplet evaporation time was studied. Based on the above evaporation time curves, plate temperatures were chosen as to offer a similar evaporation time but at temperatures below and above the Nukiyama and Leindenfrost temperatures respectively. This was done in order to isolate the effect of fuel deposits from the different evaporation mechanisms. The evaporation of successive impinging droplets was then measured. The results hence obtained indeed showed that the fuel deposit has a different impact on the evaporation time according the evaporating mechanism or equivalently the plate temperature. For plate temperatures lower than the Nukiyama temperature, gasoline and diesel fuel droplets showed an increase of their evaporation time as the amount of successive impinging droplets increased. The trend was reversed for plate temperatures above the Leindenfrost temperature. A hypothesis for this latter case is that the fuel deposit disrupts the vapor layer supporting the droplet and therefore provides a greater heat flux to the evaporating droplet. Finally, droplet evaporation times as a function of plate temperature were measured with an initial fuel deposit covering the plate. These results in turn showed that the global thermal diffusivity and porosity of the surface are changed by the presence of the fuel deposit. The consequence of these property changes are then shown to have a direct and global impact on the fuel evaporation time curves.

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.

scholarly journals Numerical Study of Evaporation Modelling for Different Fuels at High Operating Conditions in a Diesel Engine

2021 ◽  
Vol 12 (1) ◽  
pp. 8
Author(s):  
Ali Raza ◽  
Sajjad Miran ◽  
Tayyab Ul Islam ◽  
Kishwat IJaz Malik ◽  
Zunaira-Tu-Zehra ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Liquid Fuel ◽  
Fuel Injection ◽  
Numerical Study ◽  
Droplet Diameter ◽  
Operating Conditions ◽  
Injection System ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Engine Cylinder

A fuel injection system in a diesel engine has different processes that affect the complete burning of the fuel in the combustion chamber. These include the primary and secondary breakups of liquid fuel droplets and evaporation. In the present paper, evaporation of two different diesel fuels has been modelled numerically. Evaporation of n-heptane and n-decane is governed by the conservation equations of mass, energy, momentum, and species transport. Results have been plotted by varying the droplet diameter and temperature. It was observed that droplet size, temperature of droplets, and ambient temperature have notable effect on the evaporation time of diesel fuel droplets in the engine cylinder.

NONEQUILIBRIUM DIFFUSION COMBUSTION OF LIQUID FUEL DROPLETS AND SPRAYS MODELING

2012 ◽  
Vol 43 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Nickolay N. Smirnov ◽  
V. F. Nikitin ◽  
V. V. Tyurenkova
Keyword(s):  
Liquid Fuel ◽  
Diffusion Combustion ◽  
Fuel Droplets
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