scholarly journals In-cylinder Observation of Combustion Process in Small DI Diesel Engine under High Speed and Heavy Load Conditions

1998 ◽  
Vol 18 (Supplement2) ◽  
pp. 73-74
Author(s):  
Yoshihiro HOTTA ◽  
Minaji INAYOSHI ◽  
Kiyomi NAKAKITA ◽  
Nobuyuki MORI ◽  
Tomon TAKESHITA
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Combustion Process ◽  
Heavy Load ◽  
Di Diesel Engine ◽  
Load Conditions

scholarly journals Development of an optical swirl sensor for DI-diesel engines

2009 ◽  
Vol 137 (2) ◽  
pp. 37-49
Author(s):  
Robin VANHAELST ◽  
Werner HENTSCHEL ◽  
Christian MÜLLER ◽  
Jakub CZAJKA
Keyword(s):  
Diesel Engine ◽  
Optical Sensor ◽  
High Speed ◽  
Swirling Flow ◽  
Combustion Process ◽  
Optical Probe ◽  
Swirl Ratio ◽  
Acceptance Angle ◽  
Di Diesel Engine ◽  
Dimensional Simulation

In this paper the systematic development of an optical swirl sensor to measure the swirl ratio in an operating serial turbocharged DI-diesel engine is described. The optical sensor detects the visible light of the combustion, in particular the emission of the sooting flame in a wavelength range from 600 nm up to 1000 nm. The acceptance angle is so small that the soot clouds from every spray can be detected as they are being turned under the optical sensor by the swirling flow. In a first part the new optical probe method was validated on a transparent engine by comparison with high speed video recordings. In the second part several hardware variations were made on a serial DI-diesel engine which was equipped with a variable swirl valve. The influence of the opened- and closed swirl valve constellation and the piston geometry on the swirl ratio was measured with the optical probe technique. The results were compared with a zero dimensional simulation model. There was a good agreement between the swirl measurements and the 0D-model. The optical swirl sensor has proven to be a powerful tool to optimise the combustion process. Without any modifications on the cylinder head, the effect of application parameters and hardware parts on the swirl strength can be quantified for all engine loads and speeds.

scholarly journals Development of an optical swirl sensor for DI-diesel engines

2010 ◽  
Vol 143 (4) ◽  
pp. 45-59
Author(s):  
Robin VANHAELST ◽  
Jakub CZAJKA
Keyword(s):  
Diesel Engine ◽  
Optical Sensor ◽  
High Speed ◽  
Swirling Flow ◽  
Combustion Process ◽  
Optical Probe ◽  
Swirl Ratio ◽  
Acceptance Angle ◽  
Di Diesel Engine ◽  
Dimensional Simulation

In this paper the systematic development of an optical swirl sensor to measure the swirl ratio in an operating serial turbocharged DI-diesel engine is described. The optical sensor detects the visible light of the combustion, in particular the emission of the sooting flame in a wavelength range from 600 nm up to 1000 nm. The acceptance angle is so small that the soot clouds from every spray can be detected as they are beeing turned under the optical sensor by the swirling flow. In a first part the new optical probe method was validated on a transparent engine by comparison with high speed video recordings. In the second part several hardware variations were made on a serial DI-diesel engine which was equipped with a variable swirl valve. The influence of the opened- and closed swirl valve constellation, the piston geometry and the injector influence on the swirl ratio was measured with the optical probe technique. The results were compared with a zero dimensional simulation model. There was a good agreement between the swirl measurements and the 0D-model. The optical swirl sensor has proven to be a powerful tool to optimise the combustion process. Without any modifications on the cylinder head, the effect of application parameters and hardware parts on the swirl strength can be quantified for all engine loads and speeds.

CFD Modelling of the Effects of Injection Timing on the Combustion Process and Emissions in an HSDI Diesel Engine

2012 ◽  
Author(s):  
Raouf Mobasheri ◽  
Zhijun Peng
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Cfd Simulation ◽  
Direct Injection ◽  
Combustion Process ◽  
Injection Timing ◽  
Cfd Modelling ◽  
Combustion Modeling ◽  
Pressure Trace ◽  
Hsdi Diesel Engine

High-Speed Direct Injection (HSDI) diesel engines are increasingly used in automotive applications due to superior fuel economy. An advanced CFD simulation has been carried out to analyze the effect of injection timing on combustion process and emission characteristics in a four valves 2.0L Ford diesel engine. The calculation was performed from intake valve closing (IVC) to exhaust valve opening (EVO) at constant speed of 1600 rpm. Since the work was concentrated on the spray injection, mixture formation and combustion process, only a 60° sector mesh was employed for the calculations. For combustion modeling, an improved version of the Coherent Flame Model (ECFM-3Z) has been applied accompanied with advanced models for emission modeling. The results of simulation were compared against experimental data. Good agreement of calculated and measured in-cylinder pressure trace and pollutant formation trends were observed for all investigated operating points. In addition, the results showed that the current CFD model can be applied as a beneficial tool for analyzing the parameters of the diesel combustion under HSDI operating condition.

Study on the Application of Marine Biodiesel on High Speed Diesel Engines

2011 ◽  
Vol 287-290 ◽  
pp. 1976-1979
Author(s):  
Lin Cai Ma ◽  
Zhi Guo Zhou ◽  
Liang Yao Xia ◽  
Da Xue Liu ◽  
Xiao Li Yu
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Consumption Rate ◽  
Effective Power ◽  
Engine Load ◽  
Bench Tests ◽  
Fuel Consumption Rate ◽  
High Speed Diesel ◽  
Hc Emissions ◽  
Load Conditions

A bench tests were carried out on an YC6J190 diesel engine fueled with B20 marine biodiesel. The results showed that the engine’s effective power decreased by 1.8%, the fuel consumption rate increased by 0.07%, HC emissions decreased by 19.17% and the soot decreased by 25% as average under full engine load conditions. HC decreased by 23.4% and the soot decreased by 23% as average under part engine load conditions. The soot emissions decreased by 28.8% as average under the free acceleration conditions.

Effects of B20 on Combustion, Emissions and Performance of a Light-Duty Diesel Engine

2009 ◽  
Author(s):  
Amy M. Peterson ◽  
Po-I Lee ◽  
Ming-Chia Lai ◽  
Ming-Cheng Wu ◽  
Craig L. DiMaggio
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Combustion Noise ◽  
Low Temperature Combustion ◽  
Performance And Emission ◽  
Ultra Low Sulfur Diesel ◽  
White Grease ◽  
Light Duty ◽  
Di Diesel Engine ◽  
And Performance

This paper compares 20% bio-diesel (B20-choice white grease) fuel with baseline ultra low sulfur diesel (ULSD) fuel on the performance of combustion and emissions of a light-duty 4-cylinder 2.8-liter common-rail DI diesel engine. The results show that operating the engine in the Low Temperature Combustion (LTC) regime produces lower PM and NOx with a slight penalty in fuel consumption, THC, and CO emissions. B20, in general, produces less soot. A slight increase in NOx emissions is shown with B20 compared to ULSD, with an exception at the high speed point where B20 has lower NOx values. In addition, the performance and emission characteristics are investigated as a function of the ECU injection strategy. The addition of pilot injections is found to effectively reduce combustion noise and extends the injection retard window to reach LTC combustion regimes with acceptable noise level for LD diesel engines.

Applying the Representative Interactive Flamelet Model to Evaluate the Potential Effect of Wall Heat Transfer on Soot Emissions in a Small-Bore DI Diesel Engine

2001 ◽  
Author(s):  
Carl Hergart ◽  
Norbert Peters
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Wide Spectrum ◽  
Turbulent Flame ◽  
Combustion Process ◽  
Heat Losses ◽  
Wall Heat Transfer ◽  
Two Phase ◽  
Flamelet Model ◽  
Di Diesel Engine

Abstract Due to the wide spectrum of turbulent and chemical length- and time scales occurring in a HSDI diesel engine, capturing the correct physics and chemistry underlying combustion poses a tremendous modeling challenge. The processes related to the two-phase flow in a DI diesel engine add even more complexity to the total modeling effort. The Representative Interactive Flamelet (RIF) model has gained widespread attention owing to its ability of correctly describing ignition, combustion and pollutant formation phenomena. This is achieved by incorporating very detailed chemistry for the gas phase as well as the soot particle growth and oxidation, without imposing any significant computational penalty. The model, which is based on the laminar flamelet concept, treats a turbulent flame as an ensemble of thin, locally one-dimensional flame structures, whose chemistry is fast. A potential explanation for the significant underprediction of part load soot observed in previous studies applying the model is the neglect of wall heat losses in the flamelet chemistry model. By introducing an additional source term in the flamelet temperature equation, directly coupled to the wall heat transfer predicted by the CFD-code, flamelets exposed to walls are assigned heat losses of various magnitudes. Results using the model in three-dimensional simulations of the combustion process in a small-bore direct injection diesel engine indicate that the experimentally observed emissions of soot may have their origin in flame quenching at the relatively cold combustion chamber walls.

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