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Search Results: 1 - 10 of 1282 matches for " Engine "
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Blending Cooking Oil Biodiesel with Petroleum Diesel: A Comparative Performance Test on a Variable IC Engine  [PDF]
Clever Ketlogetswe, Jerekias Gandure
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.22019
Abstract: Research in biodiesel production has been motivated by several reasons including consistant increase in prices of petroleum diesel, environmental advantages, security of fuel supply, and employment creation. This paper presents a review of one alternative technological method that can be used to produce this fuel. Biodiesel from used cooking oil was produced by alkali catalyzed transesterification process. Performance of internal combustion engine using this bio-diesel blended with petroleum diesel in various blending ratios was performed. The engine performance studies were conducted on a variable compression engine test rig with automatic data acquisition set up. Parameters such as brake power, torque and fuel consumption were measured at different loads for pure petroleum diesel, pure biodiesel and different combinations of the dual fuel. The test results indicate that the performance of the engine is comparable for all the fuel mixtures under review
Effect of Exhaust Gas Recirculation on Performance and Emission Characteristics of a Diesel-Piloted Biogas Engine  [PDF]
Meshack Hawi, Robert Kiplimo, Hiram Ndiritu
Smart Grid and Renewable Energy (SGRE) , 2015, DOI: 10.4236/sgre.2015.64005
Abstract: In this research, a Direct Injection Compression Ignition (DICI) engine was modified into a dual-fuel engine that used biogas as the primary fuel and diesel as pilot fuel, with the focus on reduction of harmful exhaust emissions while maintaining high thermal efficiency. The effect of exhaust gas recirculation (EGR) on engine performance and emission characteristics was studied. The EGR system was developed and tested with different EGR percentages, i.e. 0%, 10%, 20% and 30%. The effect of EGR on exhaust gas temperature and performance parameters like brake specific fuel consumption, brake power and brake thermal efficiency was studied. The performance and emission characteristics of the modified engine were compared with those of the conventional diesel engine. The results showed that EGR led to a decrease in specific fuel consumption and an increase in brake thermal efficiency. With increase in percent (%) of EGR, the percentage increase in brake thermal efficiency was up to 10.3% at quarter load and up to 14.5% at full load for single fuel operation while for dual-fuel operation an increase up to 9.5% at quarter load and up to 11.2% at full load was observed. The results also showed that EGR caused a decrease in exhaust gas temperature; hence it’s potential to reduce NOX emission. However, emissions of HC and CO increased slightly with EGR.
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.
Website Search Engine Optimization: Geographical and Cultural Point of View  [PDF]
Osama Rababah, Muhannad Al-Shboul, Fawaz Al-Zaghoul, Rawan Ghnemat
Journal of Software Engineering and Applications (JSEA) , 2014, DOI: 10.4236/jsea.2014.713096
Abstract: The concept of Webpage visibility is usually linked to search engine optimization (SEO), and it is based on global in-link metric [1]. SEO is the process of designing Webpages to optimize its potential to rank high on search engines, preferably on the first page of the results page. The purpose of this research study is to analyze the influence of local geographical area, in terms of cultural values, and the effect of local society keywords in increasing Website visibility. Websites were analyzed by accessing the source code of their homepages through Google Chrome browser. Statistical analysis methods were selected to assess and analyze the results of the SEO and search engine visibility (SEV). The results obtained suggest that the development of Web indicators to be included should consider a local idea of visibility, and consider a certain geographical context. The geographical region that the researchers are considering in this research is the Hashemite kingdom of Jordan (HKJ). The results obtained also suggest that the use of social culture keywords leads to increase the Website visibility in search engines as well as localizes the search area such as google.jo, which localizes the search for HKJ.
Modification and tuning of diesel bus engine for biogas electricity production
Sittiboon Siripornakarachai
Maejo International Journal of Science and Technology , 2007,
Abstract: This study is to convert and tune a bus diesel engine for electricity production in a farm using biogas as fuel. The engine under study is a Hino K-13CTI 13,000 cc 24 valve turbocharged engine coupled to a 3 phase 4 pole induction motor to produce electricity at 50 Hz. Modifications include an addition of biogas carburetor for air-fuel mixing, replacing the fuel injection system with spark ignition system, reduction of compression ratio from the original 16:1 to 8:1 using a cylinder head spacer, and modification of the turbocharger waste gate so the boost pressure can be adjusted. When the induction motor is synchronized to the power grid, the running speed of the engine is 1,500 rpm. Optimal engine efficiency was achieved at 28.6% by setting the lambda factor at 1.097, ignition timing at 54o before top dead center, and the turbocharger boost at 56 kPa. With this setting, the generator power output is 134.20 kilowatt with emission of CO and NOX being 1,154 and 896 ppm respectively.
Multiple-State Quantum Carnot Engine  [PDF]
Eny Latifah, Agus Purwanto
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.211169
Abstract: A multiple-state quantum Carnot engine based on single particle in one dimensional potential well is evaluated. The general forms of adiabatic and isothermal force as well as work are given. We apply them first to the simplest case of two-state system, and then to three-state and general n-state system. The first isothermal expansion starts from single ground state and cease to single highest state. In Addition to the simplest case, isothermal expansions may terminate not to highest state but an intermediate state but with the same of the total expansion. The result is that the efficiency of the multi-state machine could be enhanced by reducing the volume of isothermal expansion for the same of the total volume expansion.
Application of Full Text Search Engine Based on Lucene  [PDF]
Rujia Gao, Danying Li, Wanlong Li, Yaze Dong
Advances in Internet of Things (AIT) , 2012, DOI: 10.4236/ait.2012.24013
Abstract: This paper introduces us the full-text search engine based on Lucene and full-text retrieval technology, including indexing and system architecture, compares the full-text search of Lucene with the String search retrieval’s response time, the experimental results show that the full text search of Lucene has faster retrieval speed.
Development and Assessment of Thermoacoustic Generators Operating by Waste Heat from Cooking Stove  [PDF]
Baiman Chen, Abdalla A. Yousif, Paul H. Riley, David B. Hann
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.412113
Abstract: This paper presents the development and assessment of two low-cost, travelling wave, thermoacoustic generators operating by waste heat energy from cooking stove. One powered by waste heat from a propane-driven stove, the other powered by waste heat from a wood-burning stove. The propane-driven thermoacoustic generator was successfully demonstrated to produce approximately 15 watts of electricity using a commercial audio loudspeaker. The wood-burning thermoacoustic generator was successfully constructed and tested to generate a maximum of 22.7 watts of electricity under a pressurised condition. The latter has a high potential to be used by over 1.5 billion people in rural communities for applications such as LED lighting, charging mobile phones or charging a 12V battery. A comprehensive power assessment of the propane-driving generator as well as the development and performance assessment of the wood-burning generator are described throughout this article.
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
Abstract:

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.

3-D Modeling of Axial Fans  [PDF]
Ali Sahili, Bashar Zogheib, Ronald M. Barron
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.44088
Abstract:

In this paper we present a full-geometry Computational Fluid Dynamics (CFD) modeling of air flow distribution from an automotive engine cooling fan. To simplify geometric modeling and mesh generation, different solution domains have been considered, the Core model, the Extended-Hub model, and the Multiple Reference Frame (MRF) model. We also consider the effect of blockage on the flow and pressure fields. The Extended-Hub model simplifies meshing without compromising accuracy. Optimal locations of the computational boundary conditions have been determined for the MRF model. The blockage results in significant difference in pressure rise, and the difference increases with increasing flow rates. Results are in good agreement with data obtained from an experimental test facility. Finally, we consider Simplified Fan Models which simplifies geometric modeling and mesh generation and significantly reduce the amount of computer memory used and time needed to carry out the calculations. Different models are compared in regards to efficiency and accuracy. The effect of using data from different planes is considered to optimize performance. The effect of blockage on simplified models is also considered.

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