Soot Concentration and Particle Size in a DI CR Diesel Engine by Broadband Scattering and Extinction Measurements

2005 ◽  
Author(s):  
E. Mancaruso ◽  
S. S. Merola ◽  
B. M. Vaglieco
Keyword(s):  
Particle Size ◽  
Diesel Engine ◽  
Soot Concentration

Investigation of Soot Concentration and Particle Size Distribution on a Single Cylinder Diesel Engine

2007 ◽  
Author(s):  
Markus Stumpf ◽  
Sascha Merkel ◽  
Peter Eckert ◽  
Uwe Wagner ◽  
Amin Velji ◽  
...  
Keyword(s):  
Particle Size ◽  
Diesel Engine ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Diesel Engines ◽  
Injection System ◽  
Exhaust Gas ◽  
Soot Concentration ◽  
Single Cylinder ◽  
Injection Pressures

The purpose of this study was the characterization of the size distribution and the concentration of the particles emitted by diesel engines under various speed and load points, and different injection pressures. Fine and ultrafine particles emitted by modern diesel engines, in particular those with sizes below 100 nm, are of significant importance for the human health, since the latter are respirable and may have therefore negative effects. The investigations described in this paper provide an insight into the formation of soot particles in the combustion chamber and their number concentration and size distribution in the exhaust gas pipe. The experiments were performed on a single cylinder diesel engine. For the purpose of comparability to multi cylinder engines, the crankshaft drive, the liner, the piston and the cylinder head were based on a heavy duty production engine. The engine was operated with a common rail injection system which was controlled by an electronic control device that offered several degrees of freedom regarding number, duration and timing of the single injections. During the investigations the engine was operated at several speed and load points with and without pilot injection. The in-cylinder soot concentration was measured crank angle resolved with the two-color-method. The Filter-Smoke-Number (FSN) and the NOx concentration were determined in the exhaust gas. Furthermore the particle number and the particle size distribution were measured by means of a Scanning Mobility Particle Sizer (SMPS). The main focus of the experiments was on the investigation of the in-cylinder soot concentration and the particle size distribution running the engine at several injection pressures during different engine speed/load configurations. In order to obtain a potential correlation to common exhaust gas quantification methods, the Filter-Smoke-Number was measured simultaneously. The results of the experiments provide knowledge which is of eminent importance with respect to further diesel combustion development with regard to both the soot concentration and the soot particle properties.

Application of a Phenomenological Soot Model for Diesel Engine Combustion

2008 ◽  
Author(s):  
Xiaobei Cheng ◽  
Hongling Jv ◽  
Yifeng Wu
Keyword(s):  
Diesel Engine ◽  
Chemical Reactions ◽  
Oxidation Rate ◽  
Soot Formation ◽  
Soot Oxidation ◽  
Soot Concentration ◽  
Engine Operation ◽  
Soot Particles ◽  
Turbulent Eddies ◽  
Soot Model

The application of the improved CFD code for the simulation of combustion and emission formation in a high-speed diesel engine has been presented and discussed. The soot concentration transport equation is found and solved together with all other flow equations. A slip correction factor is introduced into this equation. In turbulent combustion, the soot particles are contained within the turbulent eddies, and burnt up swiftly with the dissipation of these eddies in the soot oxidation zone. However, the chemical reactions always process except the dissipation of turbulent eddies and the intermixing of soot particles and turbulent eddies. The soot oxidation rate should be controlled simultaneity by the chemical reactions rate and the dissipation rate of turbulent eddies. A hybrid particle turbulent transport controlled rate and soot oxidation rate model is present in this paper and Soot formation and oxidation processes have been modeled according to this model. A reasonable agreement of the measured and computed data of in-cylinder pressure, soot, and NO emissions for different engine operation conditions has been made. The precision of simulated soot concentration is improved compare with the commonly Hiroyasu—Nagel—Strickland (HNS) soot model.

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