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Search Results: 1 - 10 of 1749 matches for " Diesel Engine. "
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Mathematical Model for the Injector of a Common Rail Fuel-Injection System  [PDF]
Simon Mar?i?, Milan Mar?i?, Zdravko Praunseis
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.76027
Abstract: The paper describes a Diesel fuel injection process. Computer simulation was carried out together with measurement of the Common Rail accumulator fuel-injection system. The computer simulation enables the observation of the phenomena from rail pressure, being the input data for injection parameters calculations, to the injection rate. By means of computer simulation, the pressure values in specific sections of the injection nozzle may be computed, the needle lift, injection rate, total injected fuel, time lag from injector current to first evidence of injection process and other time-lags between various phases of the injection process. The injection rate provides input data for spray computer simulation. Measurements of injection and combustion were carried out within a transparent research engine. This engine is a single-cylinder transparent engine based on the AUDI V6 engine, equipped with a Bosch Common Rail Injection System. The comparison between the computed and measured injection parameters showed good matching.
Investigating Diesel Engine Performance and Emissions Using CFD  [PDF]
Tarek M. Belal, El Sayed M. Marzouk, Mohsen M. Osman
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.52017

Fluid flow in an internal combustion engine presents one of the most challenging fluid dynamics problems to model. This is because the flow is associated with large density variations. So, a detailed understanding of the flow and combustion processes is required to improve performance and reduce emissions without compromising fuel economy. The simulation carried out in the present work to model DI diesel engine with bowl in piston for better understanding of the in cylinder gas motion with details of the combustion process that are essential in evaluating the effects of ingesting synthetic atmosphere on engine performance. This is needed for the course of developing a non-air recycle diesel with exhaust management system [1]. A simulation was carried out using computational fluid dynamics (CFD) code FLU- ENT. The turbulence and combustion processes are modeled with sufficient generality to include spray formation, delay period, chemical kinetics and on set of ignition. Results from the simulation compared well with that of experimental results. The model proved invaluable in obtaining details of the in cylinder flow patterns, combustion process and combustion species during the engine cycle. The results show that the model over predicting the maximum pressure peak by 6%, (p-θ), (p-v) diagrams for different engine loads are predicted. Also the study shows other engine parameters captured by the simulation such as engine emissions, fuel mass fraction, indicated gross work, ignition delay period and heat release rate.

Philip Kristanto,Rahardjo Tirtoatmodjo
Jurnal Teknik Mesin , 2000,
Abstract: One of the factor that influences optimation of performance of diesel engine is an imperfect combustion in the combustion chamber. To optimize performance of this engine it is necessary to do modification by increasing air temperature and air pressure into combustion chamber. A change of inlet air temperature in the combustion chamber will effect the air density, so will influence the amount of air in the combustion chamber. The increasing air pressure into the combustion chamber will help the mixture to reach its combustion condition faster. So that combustion deceleration, specially in the high rotation speed condition can be avoided. The result of the research showed that the optimal condition can be achieved at the temperature 50°C and the pressure 3 bars. Abstrak in Bahasa Indonesia : Salah satu faktor yang mempengaruhi optimalisasi kinerja pada motor diesel adalah pembakaran kurang sempurna di dalam ruang bakar. Untuk mengoptimalkan kinerja dari motor bakar tersebut dilakukan modifikasi dengan jalan meningkatkan suhu dan tekanan udara masuk ke ruang bakar. Perubahan suhu udara masuk ruang bakar akan berpengaruh terhadap kerapatan udara, sehingga akan mempengaruhi jumlah udara yang masuk ke ruang bakar. Penambahan tekanan pada udara yang masuk ke ruang bakar akan membantu campuran mencapai kondisi pembakaran dengan lebih cepat, sehingga keterlambatan pembakaran, terutama pada kondisi kecepatan putaran yang tinggi dapat dihindari. Hasil penelitian melalui percobaan menunjukkan bahwa kondisi optimal melalui peningkatan suhu dan udara masuk ruang bakar akan dicapai pada 50°C dan tekanan 3 bar. Kata kunci : Modifikasi Motor Diesel
Performance Analysis of Producer Gas Based Diesel Engine
J. P. Yadav
International Journal of Engineering Innovations and Research , 2013,
Abstract: Producer gas is one out of the alternative fuels used in internal combustion engines. Conventionally, it is made by flowing air and steam through a thick coal or coke bed which ranges in temperature from red hot to low temperature. The oxygen in air burns the carbon to CO2. This CO2 gets reduced to CO by contacting with carbon above the combustion zone. The freed oxygen combines with carbon and steam gets dissociated which introduces hydrogen. Producer gas has a high percentage of nitrogen since air is used [1]. Thus, in the present work a gasifier is designed and developed which could gasify any form of biomass. In the present work waste wood chips, bagasse, rice husk, and eucalyptus, etc are used for gasification in a fabricated updraft gasifier to produce producer gas. The producer gas obtained from the developed gasifier is sent along with air into a diesel engine with diesel as the primary fuel and the performance characteristics ie brake thermal efficiency, exhaust gas temperature and brake specific energy consumption of the engine are studied along with economic analysis with and without aid of producer gas.
Rahardjo Tirtoatmodjo,Ekadewi Anggraini Handoyo
Jurnal Teknik Mesin , 2000,
Abstract: A combustion process could be complete or incomplete depends on how much air available in the combustion chamber. An intercooler used to cool the air entering a combustion chamber increase the mass flowrate of air. Doing so could increase the possibility of reaction between fuel & air. When the air is cooled to 15°C, the increase of output power using the intercoole is about 1,8 %. Abstrak in Bahasa Indonesia : Jumlah udara yang tersedia di ruang bakar sangat menentukan kesempurnaan hasil pembakaran yang bisa dicapai. Dengan adanya pipa pendingin yang mendinginkan udara sebelum masuk ke ruang bakar akan meningkatkan kapasitas massa dari udara sehingga meningkatkan kemungkinan setiap molekul bahan bakar untuk bertemu dengan molekul udara. Peningkatan daya yang dicapai dengan penambahan pendingin ini adalah sekitar 1,8 % jika didinginkan hingga mencapai 15 °C. Kata kunci : motor diesel, pipa pendingin, daya.
A Comparative Study of Thumba Seed Bio Diesel  [PDF]
V. K Gorana, N. L Panwar, Shiv Lal
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.24052
Abstract: Biodiesel is considering a clean-burning fuel produced from non edible vegetable oils, or animal fats. It is produced by transesterification of oils with short-chain alcohols or by the esterification of fatty acids. In the present context, biodiesel is an alternative eco friendly diesel fuel. Keeping this in view, an attempt has been made through the experiment of Thumba blended biodiesel on CI engine in laboratory and analyzes its properties and characteristic compare with other biodiesel oils. Five blends B05, B10, B15, B20 and B25 of thumba seed oil biodiesel were papered and it performance was evaluated with 7HP four-stroke diesel engine. The performance of thumba seed oil biodiesel were compared with biodiesel prepared by mustard, castor and Jatropha seed oil with same blends.
Study on Performance and Emission Characteristics of a Compression Ignition Engine Fueled with Diesel-2 Ethoxy Ethyl Acetate Blends  [PDF]
R. Senthil, M. Kannan, B. Deepanraj, V. Nadanakumar, S. Santhanakrishnan, P. Lawrence
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.311141
Abstract: Diesel engines are the major contributors of various types of air polluting gases like carbon monoxide, oxides of nitrogen, smoke, etc. Improvement of fuel properties is essential for suppression of Diesel pollutant emissions along with the optimization of design factors and after treatment equipment. Studies conducted in the past have shown that a significant reduction were obtained in the emissions using oxygenates. This paper investigates the performance and emission characteristics of a direct injection Diesel engine fueled with 2 Ethoxy Ethyl Acetate (EEA) blends. Different fuel blends which contain 5%, 10% and 15% of EEA were prepared and the effect of these blends on performance and emissions were studied on a single cylinder direct injection Diesel engine. The blends were tested under different load conditions and the result showed that EEA blended fuels improves the performance of the engine and reduce the emission level significantly.
Optimal Mixture Ratios of Biodiesel Ethanol Diesel for Diesel Engines  [PDF]
Jun LI, Chao GUO, Wen Bin WANG, Zhuo Jian WU
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.35078
Abstract: In this paper, we study the best-mixture ratio of biodiesel-ethanol-diesel for diesel engines. The simulation results show that the integrated indexes including engine power, cost-effectiveness and emission properties are rather better with different optimizing index when the ratio of bio-diesel, ethanol and diesel are 71.58:2.72:25.70 and 50:2.4127:47.5873.
Effect of Petroleum Products on Soil Catalase and Dehydrogenase Activities  [PDF]
Fidelis Ifeakachuku Achuba, Patrick Nwanze Okoh
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.412040
Abstract: The effect of refined petroleum products on the activities of selected enzymes (catalase and dehydrogenase) was studied. There was a significant decrease (p < 0.01) in catalase activity. Catalase activity was higher in diesel and engine-oil treated soil after twelve days relative to petrol and kerosene. These observations indicate that the enzyme activity is the order of petrol > kerosene > diesel > engine oil. However, a significant increase (p < 0.01) was observed in dehydrogenase activity after twelve days relative to control values. Although, the refined petroleum products caused a similar pattern in the alteration of soil dehydrogenase activity, as they affected catalase activities, the general results indicate that the toxic effect is in the order of kerosene > diesel > petrol > engine oil. On the whole the results reveal that refined petroleum products alter soil biochemistry.
Simulation Studies of Diesel Engine Combustion Characteristics with Oxygen Enriched Air  [PDF]
Heng Wang, Weijun Liu
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.38002
Abstract: Based on a six-cylinder direct injection diesel engine, the engine operating condition was simulated by application AVL-FIRE software coupling the n-heptane reduced mechanism containing polycyclic aromatic hydrocarbon (PAH) formation. The simulation and its verification test were both carried out under the maximum torque point. Then, the oxygen enriched combustion was simulated on the model, and the simulated condition was oxygen volume fraction from 21% to 30%. The simulation results show that, the oxygen enrichment (from 21% to 30%) increases the peak cylinder pressure of 3.32%, advances the start of combustion of 1.6 deg and rises the peak of average temperature in cylinder and wall heat flux. Among them, at the condition of 24% O2, the change of the results is the most significant. Benzene (A1) is one of the precursors of soot generated, the analysis of its impress-cuts of the mass distribution field in cylinder shows that, the increase of oxygen concentration can significantly inhibit the formation of benzene. But the oxygen enrichment makes the combustion more sufficient, cased a rise in the cylinder temperature, an extension in high temperature area, and an increment in the NOx emission.
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