scholarly journals Study on the Combustion Process and Emissions of a Turbocharged Diesel Engine with EGR

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Mei Deqing ◽  
Qian Junnan ◽  
Sun Ping ◽  
Miao Yan ◽  
Zhang Shuang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Combustion Process ◽  
Operating Mode ◽  
Emission Characteristics ◽  
Turbocharged Diesel Engine ◽  
Compressed Gas ◽  
Order Polynomial ◽  
Increase Rate ◽  
Smoke Opacity

A high pressure EGR system was adopted to a turbocharged inter-cooled diesel engine, to analyze its combustion and emission characteristics under the condition of different loads and constant speed. Under the same steady operating mode, with the increase of EGR rate, the temperature of compressed gas ascended, the ignition delay was shortened, the pressure and temperature of the burned gas descended, and the combustion process was prolonged. According to the experimental data, it was found that, at the same EGR rate, lower the load of engine was, lower the temperature in cylinder, and higher the increase rate of CO was. However, the increase rate of HC present a falling trend. The decrease rate of the specific emission of NOxlinearly varied with EGR rate with a slope of 1.651. The increase rate of smoke opacity behaved a second-order polynomial uprising trend, and the higher the load was, the sharpener the smoke opacity deteriorated, with the increase of EGR rate. From the point of emission view, the engine with EGR system can achieve the lesser exhaust emissions in some operations by adjusting the engine parameters.

Combustion and emission characteristics of a turbocharged diesel engine using high premixed ratio of methanol and diesel fuel

Fuel ◽  
2015 ◽  
Vol 140 ◽  
pp. 156-163 ◽  
Author(s):  
Lijiang Wei ◽  
Chunde Yao ◽  
Quangang Wang ◽  
Wang Pan ◽  
Guopeng Han
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Emission Characteristics ◽  
Turbocharged Diesel Engine

Study of combustion and emission characteristics of turbocharged diesel engine fuelled with dimethylether

2008 ◽  
Vol 2 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Junhua Wu ◽  
Zhen Huang ◽  
Xinqi Qiao ◽  
Jun Lu ◽  
Junjun Zhang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Emission Characteristics ◽  
Turbocharged Diesel Engine

scholarly journals Evaluation of Combustion Performance and Heat Release in Preheated Fuel Consumed Diesel Engines

2021 ◽  
Vol 31 (3) ◽  
pp. 349-363
Author(s):  
Sergey А. Plotnikov ◽  
Anatoly N. Kartashevich ◽  
Marina V. Motovilova
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Heat Release ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Heating Temperature ◽  
Combustion Process ◽  
Thermal Action ◽  
Fuel Combustion ◽  
Combustion Performance

Introduction. The expansion of the fleet of tractors and vehicles causes increased requirements for internal combustion engines. This problem can be solved by improving the work process in a diesel engine that can be achieved by heating the diesel fuel in the fuel supply system. External thermal action is carried out on the high pressure line directly in front of the injectors. Materials and Methods. To analyze and calculate the process of combustion and heat release in a diesel engine with preliminary thermal fuel preparation, bench tests were carried out using the National Instruments software and the necessary equipment. Results. Experimental data of the diesel fuel combustion process in the cylinder of the 4CHN 11.0/12.5 engine are obtained. The analysis of the combustion performance and heat release of diesel with a preliminary high-temperature effect on the fuel was carried out. Indicator diagrams, graphs of heat release, the maximum average temperature of gases in the engine cylinder, and graphs of active and total heat release were constructed. The experimental data showed a decrease in the ignition delay period, the maximum cycle temperature in the engine cylinders, and an acceleration of the start of heat release and combustion process. The values of the parameters of the diesel fuel combustion process are obtained. Discussion and Conclusion. On the basis of the conducted studies, the dependences of the parameters of the combustion process of a diesel engine with fuel heating to high temperatures are revealed. Indicator diagrams allow drawing a conclusion about the influence of the fuel heating temperature on the intensification of the combustion process. There is an acceleration of the beginning of heat release, a decrease in the rate of pressure build-up and in the rigidity of the engine.

Effects of Substitution Ratio on the Emission Characteristics of a Dual-Fuel Engine Fueled with Pilot Diesel Fuel and Methanol

2015 ◽  
Vol 1092-1093 ◽  
pp. 504-507
Author(s):  
Ya Chong Shen ◽  
Chun Hua Zhang ◽  
Gang Li ◽  
Jia Wang Zhou
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Experimental Results ◽  
Constant Speed ◽  
Dual Fuel ◽  
Emission Characteristics ◽  
Turbocharged Diesel Engine ◽  
Intake Pipe ◽  
Substitution Ratio ◽  
Hc Emissions

Substitution ratio is an important parameter influencing on the performance of dual-fuel engine. In order to study the effects of substitution ratio on the emission characteristics of diesel/ methanol dual-fuel engine, a 6-cylinder turbocharged diesel engine was converted into a dual-fuel engine fueled with pilot diesel fuel and methanol. Methanol was injected into the intake pipe and ignited by pilot diesel fuel. Experiments were performed at a constant speed of 1400 r/min, and at three different engine loads of 40%, 60% and 100%. The experimental results indicate that CO and HC emissions of dual-fuel mode both increase significantly with the increase of substitution ratio, and are higher than those of diesel mode. Compared to diesel mode, dual-fuel mode generates lower NOx and smoke emissions. In addition, as substitution ratio increases, NOx and smoke emissions are decreased.

Effects of the Re-Entrant Bowl Geometry on a DI Turbocharged Diesel Engine Performance and Emissions—A CFD Approach

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
S. Pasupathy Venkateswaran ◽  
G. Nagarajan
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Engine Performance ◽  
Maximum Diameter ◽  
Diffusion Combustion ◽  
Turbocharged Diesel Engine ◽  
Performance And Emissions ◽  
Di Diesel Engine ◽  
Fuel Mixing

The purpose of this study is to investigate the influence of re-entrant bowl geometry on both engine performance and combustion efficiency in a direct injection (DI), turbocharged diesel engine for heavy-duty applications. The piston bowl design is one of the most important factors that affect the air–fuel mixing and the subsequent combustion and pollutant formation processes in a DI diesel engine. The bowl geometry and dimensions, such as the pip region, bowl lip area, and toroidal radius, are all known to have an effect on the in-cylinder mixing and combustion processes. Based on the idea of enhancing diffusion combustion at the later stage of the combustion period, three different bowl geometries, namely, bowl 1 (baseline), bowl 2, and bowl 3 were selected and investigated. All the other relevant parameters, namely, compression ratio, maximum diameter of the bowl, squish clearance and injection rate were kept constant. A commercial CFD code STAR-CD was used to model the in-cylinder flows and combustion process, and experimental results of the baseline bowl were used to validate the numerical model. The simulation results show that, bowl 3 enhance the turbulence and hence results in better air-fuel mixing among all three bowls in a DI diesel engine. As a result, the indicated specific fuel consumption and soot emission reduced although the NOx emission is increased owing to better mixing and a faster combustion process. Globally, since the reduction in soot is larger (−46% as regards baseline) than the increase in NOx (+15% as regards baseline), it can be concluded that bowl 3 is the best trade-off between performance and emissions.

Study on the Effect of Fuel Sulfur Content on Emission Characteristics in Diesel Engine

2014 ◽  
Vol 577 ◽  
pp. 27-30 ◽  
Author(s):  
An Kang Wu ◽  
Xiang Dong Yang ◽  
Hua Zhou ◽  
Ke Jiu Lu
Keyword(s):  
Diesel Engine ◽  
Sulfur Content ◽  
Direct Injection ◽  
Emission Characteristics ◽  
Smoke Emission ◽  
Turbocharged Diesel Engine ◽  
Low Load ◽  
Significant Change ◽  
Hc Emissions

In a direct injection turbocharged diesel engine, four fuels with different sulfur content is used to study the effects of emission characteristics in diesel engine. Results show that the smoke emission have certain relations with sulfur content on fuel, the smoke emission decreases remarkably with the decreases of fuel sulfur content, and the sulfur content on fuel has a greater influence on the smoke emission at low load of the diese1 engine, the NOxemissions has no significant change when the engine fuelled with different sulfur content on fuel, while the CO and HC emissions will drop significantly.

Simulation Investigation about Combustion and Emission Characteristics of n-Butanol/Diesel Fuel Mixture on Diesel Engine

2014 ◽  
Vol 541-542 ◽  
pp. 763-768 ◽  
Author(s):  
Jian Wu ◽  
Hong Ming Wang ◽  
Li Li Zhu ◽  
Yang Hua
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Calculation Model ◽  
Emission Characteristics ◽  
Test Results ◽  
Combustion Pressure ◽  
Indicator Diagram ◽  
Simulation Results

In this paper, combustion process was simulated on diesel engine with n-butanol/diesel blends in 3000 r/min, 300 Nm using AVL FIRE ESE Diesel. By comparison with indicator diagram, simulation results were consistent with the test results using pure diesel and 5%(volume of n-butanol) n-butanol/diesel blends. Using the calculation model combustion in cylinder is calculated burning B10(mass friction of n-butanol is 10%), B20 and B30 n-butanol /diesel mixture. The results show that the maximum combustion pressure and temperature gradually increases, and accumulated heat of release slightly reduces with the adding of n-butanol. BSFC increases, but indicated efficiency reduces. Mass friction of soot significantly reduce, and mass friction of NOx firstly decreases then increases with the adding of n-butanol. This will provide a basis to the research of n-butanol as substitute fuel.

Sign in / Sign up

Export Citation Format

Share Document