Two-color time-resolved LII applied to soot particle sizing in the cylinder of a Diesel engine

2006 ◽  
Vol 147 (1-2) ◽  
pp. 79-92 ◽  
Author(s):  
B KOCK ◽  
B TRIBALET ◽  
C SCHULZ ◽  
P ROTH
Keyword(s):  
Diesel Engine ◽  
Soot Particle ◽  
Particle Sizing ◽  
Time Resolved

Two-dimensional soot-particle sizing by time-resolved laser-induced incandescence

1995 ◽  
Vol 20 (22) ◽  
pp. 2342 ◽  
Author(s):  
Stefan Will ◽  
Stephan Schraml ◽  
Alfred Leipertz
Keyword(s):  
Soot Particle ◽  
Particle Sizing ◽  
Two Dimensional ◽  
Time Resolved ◽  
Laser Induced Incandescence

Experimental and theoretical study of particulate re-entrainment from the combustion chamber walls of a diesel engine

1997 ◽  
Vol 211 (1) ◽  
pp. 49-57 ◽  
Author(s):  
M Abu-Qudais ◽  
D. B. Kittelson
Keyword(s):  
Particulate Matter ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Mass Concentration ◽  
High Surface ◽  
Combustion Process ◽  
Surface Shear ◽  
Time Resolved ◽  
Soot Deposition ◽  
Engine Cycle

The purpose of this research was to investigate the influence of the in-cylinder surfaces on the net emission of the particulate matter in the exhaust of a single cylinder, diesel engine. In order to obtain this information, time-resolved sampling was done to characterize the particulate matter emitted in the engine exhaust. A rotating probe sampled the free exhaust plume once each engine cycle. The rotation of the probe was synchronized with the engine cycle in such a way that the samples could be taken at any predetermined crank angle degree window. The sampling probe was designed for isokinetic sampling in order to obtain reliable results. To characterize the exhaust particulate in real time, a filter for mass concentration measurements was used. The results showed about 45 per cent higher mass concentrations as well as particles of larger diameter emitted during blowdown than late in the displacement phase of the exhaust stroke. This suggests that high in-cylinder shear rates and velocities which are associated with the blowdown process, cause the deposited soot to be re-entrained from the surfaces of the combustion chamber, where re-entrainment is favoured by conditions of high surface shear. A mathematical model to predict the amount of soot re-entrained from the cylinder walls is presented. This model is based on information presented in the literature along with the results of the time-resolved measurements of mass concentration. This model supported the hypothesis of soot deposition during the combustion process, with subsequent re-entrainment during the blowdown process of the exhaust stroke.

Numerical Study of Temperature and Incandescence Intensity of Nanosecond Pulsed-Laser Heated Soot Particles at High Pressures

2005 ◽  
Author(s):  
Fengshan Liu ◽  
David R. Snelling ◽  
Gregory J. Smallwood
Keyword(s):  
Soot Particle ◽  
High Pressures ◽  
Particle Diameter ◽  
Aggregate Size ◽  
Primary Particle Diameter ◽  
Time Resolved ◽  
Soot Particles ◽  
Nanosecond Pulsed Laser ◽  
Primary Particles ◽  
Laser Heated

Histories of temperature and incandescence intensity of nanosecond pulsed-laser heated soot particles of polydispersed primary particles and aggregate sizes were calculated using an aggregate-based heat transfer model at pressures from 1 atm up to 50 atm. The local gas temperature, distributions of soot primary particle diameter and aggregate size assumed in the calculations were similar to those found in an atmospheric laminar diffusion flame. Relatively low laser fluences were considered to keep the peak particle temperatures below about 3400 K to ensure negligible soot particle sublimation. The shielding effect on the heat conduction between aggregated soot particles and the surrounding gas was accounted for based on results of direct simulation Monte Carlo calculations. After the laser pulse, the temperature of soot particles with larger primary particles or larger aggregates cools down slower than those with smaller primary particles or smaller aggregates due to smaller surface area-to-volume ratios. The effective temperature of soot particles in the laser probe volume was calculated based on the ratio of thermal radiation intensities of the soot particle ensemble at 400 and 780 nm. Due to the reduced mean free path of molecules with increasing pressure, the heat conduction between soot particles and the surrounding gas shifts from the free-molecular to the transition regime. Consequently, the rate of conduction heat loss from the soot particles increases significantly with pressure. The lifetime of laser-induced incandescence (LII) signal is significantly reduced as the pressure increases. At high pressures, the time resolved soot particle temperature is very sensitive to both the primary particle diameter and the aggregate size distributions, implying the time-resolved LII particle sizing techniques developed at atmospheric pressure lose their effectiveness at high pressures.

In-flame soot particle structure on the up- and down-swirl side of a wall-interacting jet in a small-bore diesel engine

2019 ◽  
Vol 37 (4) ◽  
pp. 4847-4855 ◽  
Author(s):  
Yilong Zhang ◽  
Dongchan Kim ◽  
Lingzhe Rao ◽  
Sanghoon Kook ◽  
Kenneth S. Kim ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Soot Particle ◽  
Particle Structure

scholarly journals Soot particle trajectories of a Di diesel engine at 18° ATDC crankshaft angle

2013 ◽  
Vol 50 ◽  
pp. 012003
Author(s):  
M H M Hafidzal ◽  
W M F W Mahmood ◽  
M Z A Manaf ◽  
M S Zakaria ◽  
M N A Saadun ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Soot Particle ◽  
Particle Trajectories ◽  
Di Diesel Engine ◽  
Crankshaft Angle
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