Impact of Fuel Properties on the Performance of a Direct Injection Diesel Engine under Part Homogeneous Operating Conditions

2011 ◽  
Author(s):  
Stefan Pischinger ◽  
Vinod K. Rajamani ◽  
Yousef Jeihouni
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Operating Conditions ◽  
Fuel Properties ◽  
Direct Injection Diesel Engine

Phenomenology of Smoke From Direct Injection Diesel Engine

2005 ◽  
Author(s):  
Y. V. Aghav ◽  
P. A. Lakshminarayanan ◽  
M. K. G. Babu ◽  
N. S. Nayak ◽  
A. D. Dani
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Operating Conditions ◽  
Turbulence Structure ◽  
One Dimensional ◽  
Direct Injection Diesel Engine ◽  
Wall Impingement ◽  
Di Diesel Engine ◽  
Dissipation Model ◽  
Wall Interaction

A phenomenological model for smoke prediction from a direct injection (DI) diesel engine is newly evolved from an eddy dissipation model of Dent [1]. The turbulence structure of fuel spray is developed by incorporating the wall impingement to explain smoke formed in free and wall portions. The spray wall interaction is unavoidable in case of modern DI diesel engines of bore less than 125 mm. The new model is one dimensional and based on the recent phenomenological description of spray combustion in direct injection diesel engine. Integration of net soot rate and no need to use empirical tuning constants are the important features, which distinguish the model from existing models. Smoke values are successfully predicted using this model for an engine with heavy-duty applications under widely varying operating conditions.

Low-sooting combustion in a small-bore high-speed direct-injection diesel engine using narrow-angle injectors

2008 ◽  
Vol 222 (10) ◽  
pp. 1927-1937 ◽  
Author(s):  
T-G Fang ◽  
R E Coverdill ◽  
C-F F Lee ◽  
R A White
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Direct Injection ◽  
Fuel Efficiency ◽  
Operating Conditions ◽  
Injection Timing ◽  
Exhaust Pipe ◽  
Injection Angle ◽  
Direct Injection Diesel Engine ◽  
Combustion Flame

An optically accessible high-speed direct-injection diesel engine was used to study the effects of injection angles on low-sooting combustion. A digital high-speed camera was employed to capture the entire cycle combustion and spray evolution processes under seven operating conditions including post-top-dead centre (TDC) injection and pre-TDC injection strategies. The nitrogen oxide (NO x) emissions were also measured in the exhaust pipe. In-cylinder pressure data and heat release rate calculations were conducted. All the cases show premixed combustion features. For post-TDC injection cases, a large amount of fuel deposition is seen for a narrower-injection-angle tip, i.e. the 70° tip, and ignition is observed near the injector tip in the centre of the bowl, while for a wider-injection-angle tip, namely a 110° tip, ignition occurs near the spray tip in the vicinity of the bowl wall. The combustion flame is near the bowl wall and at the central region of the bowl for the 70° tip. However, the flame is more distributed and centralized for the 110° tip. Longer spray penetration is found for the pre-TDC injection timing cases. Liquid fuel impinges on the bowl wall or on the piston top and a fuel film is formed. Ignition for all the pre-TDC injection cases occur in a distributed way in the piston bowl. Two different combustion modes are observed for the pre-TDC injection cases including a homogeneous bulky combustion flame at earlier crank angles and a heterogeneous film combustion mode with luminous sooting flame at later crank angles. In terms of soot emissions, NO x emissions, and fuel efficiency, results show that the late post-TDC injection strategy gives the best performance.

Investigation of the Benefits of Controlling the Start of Combustion in a Direct Injection Diesel Engine Using an Optical Sensor

1994 ◽  
Vol 208 (2) ◽  
pp. 129-137 ◽  
Author(s):  
N Ladommatos ◽  
R A Balian ◽  
R Horrocks ◽  
L Cooper
Keyword(s):  
Diesel Engine ◽  
Optical Sensor ◽  
Direct Injection ◽  
Exhaust Emissions ◽  
Operating Conditions ◽  
Engine Exhaust ◽  
Diesel Engine Exhaust ◽  
Direct Injection Diesel Engine ◽  
Ignition Quality ◽  
Start Of Combustion

Results are presented which show the effect of controlling the start of combustion on direct injection diesel engine exhaust emissions at various engine operating conditions. The ability of the sensor to detect reliably the start of combustion under various engine conditions is first assessed. The effects on exhaust emissions of controlling the start of combustion is then evaluated using a fuel of reduced ignition quality.

Development of a Real-Time NOx Prediction Model Based on Heat Release Analysis in a Direct-Injection Diesel Engine

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Dong Wang ◽  
Chao Zhang
Keyword(s):  
Diesel Engine ◽  
Prediction Model ◽  
Heat Release ◽  
Real Time ◽  
Heat Release Rate ◽  
Release Rate ◽  
Direct Injection ◽  
Operating Conditions ◽  
Nox Emissions ◽  
Direct Injection Diesel Engine

A prediction model, which describes linear relationship between the nitrogen oxides (NOx) emissions and the in-cylinder heat release rate in a direct-injection diesel engine, was developed through numerical simulations. A modified KIVA-3 V code was used to calculate NOx formations and to conduct heat release analyses in a direct-injection diesel engine under different operating conditions. The numerical simulation results indicated that the NOx formation amount was related to both the magnitude and the timing of the peak heat release rate in each engine cycle. Based on the above observations, a control-oriented dynamic NOx model was constructed and then implemented into a feedback emission control system on a small diesel engine. A new parameter—combustion acceleration—was proposed in this research to describe the intensity of the premixed combustion. Experimental work was also conducted to measure the real-time in-cylinder pressure at each crank-angle when the engine was running and the heat release rate was calculated instantaneously to control an exhaust gas recirculation (EGR) valve. The experimental results showed that the proposed NOx prediction model was effective in controlling NOx emissions under high rpm conditions.

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