Ci Engine Essay

1620 Words 6 Pages
This project is a group work, will be accomplished by three students in about 20 weeks. A single cylinder test engine block will be combined with a Ford cylinder head, then to be installed on the testbed coupled with an AC dynamometer. After connecting the control sensors, the engine will be tested in various operating conditions.

1.1 Background

Engine is a machine which converts any form of energy into mechanical energy, especially the combustion engine converts combustion energy into mechanical energy. The reciprocating internal combustion engine has two main types:SI engines, where the fuel is ignited by a spark; and CI engines, where the rise in the temperature and pressure during compression is sufficient to cause spontaneous ignition
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Rudolf, a German inventor, patented the principle of the diesel engine in 1893. Since 1900, the diesel engine has been used in practically all the heavy industry and in any place that needs tremendous power. In the diesel engine, air alone is compressed in the cylinder; then, after the air has been compressed, injector vaporizes a charge of fuel into the cylinder, and ignition is accomplished by the heat of compression. The main difference between the diesel engine and the gasoline engine is: the diesel engine use a low-grade oil for fuel, which is ignited in the cylinder by the heat of air compression. However, the gasoline engine requires high-grade fuel oil, which is ignited by an electric spark after the gasoline has been mixed with air in carburettor, injected into the cylinder and the mixture compressed. …show more content…
For example, a body in which the distribution of an unknown variable (such as temperature and displacement) is required. Firstly, the region is divided into an assembly of subdivisions called elements, which are considered to be interconnected at joints, known as nodes. The combined elemental representations adequately approximate the variable. The distribution across each element may be defined by a polynomial (for example, linear or quadratic) or a trigonometric function. After the problem has been discretized, the governing equations for each element are calculated and then assembled to give the system equations. Once the general format of the equations of an element type is derived, the calculation of the equations for each occurrence of that element in the body is straightforward; it is simply a question of substituting the node coordinates, material properties and loading conditions of the element into the general format. After solving for the unknown nodal values, it is then simple to use the temperatures to calculate the elemental heat flows, or the displacements to find the strains and then the elemental stresses. The finite element method is a straightforward and logical procedure following a well-defined path.

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