The Physics of a Diesel Engine Essay - 921 Words

The Physics of a Diesel Engine The world we live in is surrounded by diesel engines. They are on the freeways, railways, airways, and are one of the leading electricity producers in the world. They are also becoming more popular in automobiles. These engines are efficient and reliable and they are getting very sophisticated. However, the physics behind these engines has not changed. By way of definition, courtesy of Diesel Engine Engineering: [a] diesel engine is an internal combustion engine in which the chemical energy of fuel is transformed into thermal energy of the cylinder charge, in consequence of the self-ignition and combustion of fuel in the engine cylinder after compression of the air charge in the cylinder (p1†¦show more content†¦The piston then travels down pulling in fresh air, (third stroke), after the piston bottoms again it travels up compressing the fresh air, (fourth stroke). The fuel is then injected and one cycle is completed in 720 degrees or two full rotations of the crankshaft. The disadvantage of two-stroke engines is their dependency on a blower to force air into the chamber and their inefficiency. A four-stroke engine does not have an expansion stroke every 360 degrees but it is more efficient because it has more time to completely burn the fuel injected into the cylinder. There are mechanical and fundamental differences between the two-stroke and four-stroke engines but the physics remain the same. They both rely upon the compressed air to ignite the pressurized fuel and the resulting expansion for their power. At first glance it may look like the explosion in the chamber does the work but upon further inspection you can see the physics involved. There are two questions I would like to address. The first question is what is the physics behind the compressed air raising the temperature upwards of 900 degrees. The second question is what is the physics behind the rapid expansion of the ignited air fuel mixture. The physics behind the temperature increase of compressed air begins with a fresh charge of air. The air fills the combustion chamber when the cylinder is at bottom dead center. As theShow MoreRelatedThe Stroke Combustion Cycle ( Ice ) Revolutionized The Way The Man Think And Moves1352 Words   |  6 PagesInternal Combustion Engines (ICE) revolutionized the way the Man think and Moves. Internal Combustion Engines are also significantly more efficient than the well-known steam engine. Today it has better power than electric batteries and motors, and offers similar overall efficiency. Small, lightweight ICE made personal transportation possible. It transformed how we built cities and did business. Engines are so important for the advancement on any society, nowadays without engines it will be much harderRead MoreOccupational Medicine And Occupational Health1571 Words   |  7 Pagesindustrial hygienists is to make opinions to correct, reduce, or eliminate workplace hazards in the ar eas of chemical, biological, or physical exposure. Professional industrial hygienists are required to be educated in chemistry, biology, engineering, physics, or specifically in industrial hygiene in order to be able to comply with monitoring and controlling the use of toxic and hazardous substances. Some of the tools used in industrial hygiene are respirators and medical surveillance necessary to approachRead MoreWhat Does Thermodynamics Affect The World?1458 Words   |  6 Pagesaround us. This is very important because thermodynamics is understanding heat, and without heat, humans would not be able to survive. Something more familiar to you, like Newton Laws of Physics, takes a look at the big picture of physical motion and how it effects the world around us. â€Å"Thermodynamics is a branch of physics which deals with the energy and work of a system.† Without the knowledge of thermodynamics, everyday life would be much different. Thermodynamics were used to designed and manufacturedRead MoreUse Of Diesohol As A Substitute For Diesel1670 Words   |  7 PagesIn our world today diesel engines have become a substantial part of the society, being used in buses, trucks, locomotives, tractors, and so on. Scientist has been seeking ways of improving the efficiency of diesel engines by developing and testing alternative fuels. Recent studies explore the use of diesohol as a substitute to diesel. Diesohol are classified as â€Å"a mixture of diesel fuel and anhydrous alcohol blended using a chemical emulsifier,† (Environmental Protection Agency, 2003).However a majorRead MoreThe Use Of Port Injection Gasoline With Direct Injection Diesel Fuel2774 Words   |  12 Pagestremendous potential to be used in CI engines effectively based on the RCCI concept. Operating a CI engine in the RCCI mode has become possible as the result of new fuel system technology and engine controls. The high octane number fuel used in the literature is often gasoline or ethanol. The U.S. Department of Energy has devoted significant resources to its national laboratories to investigate the practical applications of port-injection gasoline with direct-injection diesel fuel, as seen in recent publicationsRead MoreIs Mechanical Engineering Beng At Liverpool John Moores University?1753 Words   |  8 PagesLJMU with University of Liverpool. Lastly, it presents an argument in thermodynamics, a module taught at the first year of Liverpool John Moores University Mechanical Engineering BEng program, which is a comparison between the efficiency of diesel and petrol engines. A:- A bachelor degree of Mechanical Engineering is my selected major to study at Liverpool John Moores University. LJMU is one of the leading school in teaching a practical degree of Mechanical Engineering. This degree provides many jobRead MoreThe Invention Of The Nineteenth Century Essay1890 Words   |  8 Pageswhether it is a mechanical device or graphics, literature, or music, is an invention. The eighteenth, nineteenth and the twentieth centuries were met with innumerable of new inventions, technical breakthroughs, and innovations. Steam locomotive, diesel engine and the internet were two of the technological innovations that revolutionized societies in the nineteenth and twentieth century. Invented in England in 1814, Steam locomotive was one of the technological inventions that revolutionized the worldRead MoreBiofuels2310 Words   |  10 Pagesresources, if we focus it on producing vegetable oil using the land resources, we will greatly reduce the demand for petroleum products. .. Our engine is extremely VERSATILE, being able to run on diesel, bio-diesels, vegetable oils with very little change in power and efficiency. This will diversify the kind of fuels that can run a diesel engine and reduce the dependence on fossil fuels. †¢ ECO-FRIENDLY .. No additional Carbon Oxides are emitted into the atmosphere. .. This is because onlyRead MorePhysics for Industries1918 Words   |  8 PagesINTRODUCTION Physics attempts to describe the fundamental nature of the universe and how it works, always striving for the simplest explanations common to the most diverse behaviour. For example, physics explains why rainbows have colours, what keeps a satellite in orbit, and what atoms and nuclei are made of. The goal of physics is to explain as many things as possible using as few laws as possible, revealing nature s underlying simplicity and beauty. Physics has been applied in many industrialRead MoreApplications of Physics For Different Industries Essays1950 Words   |  8 PagesINTRODUCTION Physics attempts to describe the fundamental nature of the universe and how it works, always striving for the simplest explanations common to the most diverse behaviour. For example, physics explains why rainbows have colours, what keeps a satellite in orbit, and what atoms and nuclei are made of. The goal of physics is to explain as many things as possible using as few laws as possible, revealing natures underlying simplicity and beauty. Physics has been applied in many industrial