Lab 2 - Gas Engine -Final PaperLAB2 SumReport

Lab 2 Gas Engine - Analysis of an Internal Combustion Engine Full Load Performance A report on an experiment performed for ME 115 Thermal

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Unformatted text preview: Analysis of an Internal Combustion Engine Full Load Performance A report on an experiment performed for ME 115 Thermal Engineering Laboratory San Jose State University Department of Mechanical and Aerospace Engineering By Background and Objectives The objectives of this lab was to study the Internal combustion engines (ICEs) to better understand how it works with that we can learn ways to manipulate it to meet a variety of needs. Today’s society heavily relies on fuel vehicular transportations such as automobiles and motorcycles. Inside most of those vehicles, they have two main types of engines. The ICEs are the two-stroke (TSICE) and the four-stroke (FSICE). They are both named after the number of it’s cycles of operation.The TSICE has two basic strokes. The first stroke allows the air and fuel to be fed into the chamber. The second stroke is the ignition of the mixture, where power is produced. When the second stroke goes back to top dead center (TDC), the exhaust is pushed out with it. Then the whole cycle starts over again. The FSICE has four strokes; compression, ignition, exhaust, and air intake. The diagram in the Figure 1 shows the details and description of each stroke. Most of the street vehicles have FSICEs. The TSICE, counter part, was considered by the engineering society and it was not suited for many reasons. One of the main reasons was that it was not as durable. Although the TSICE produces twice the power of the FSICEs, it doesn’t have an internal lubrication system. It uses the fuel mixture with oil to keep it lubricated. Even with great maintenance, the ends results are high pollution with short engine life. The FSICE is much more reliable and cleaner when maintained appropriately. Most of the vehicles are using gasoline for now. Gasoline fuel has an energy content of approximately 44,000 kJ/kg. The FSICE has a maximum mechanical power conversion efficiency of less than 25%. We studied the Cusson’s 3.5 HP FSICE test apparatus to obtain the below objectives. Main objectives: Develop an understanding of basic internal combustion engine performance o Determine the speed, load, and fuel flow rate producing the maximum brake thermal efficiency o Find the peak on the HP vs. speed curve by varying the speed and load o Find minimum fuel and air input while speed and load maintained constant o Find the maximum fuel efficiency point Theory Summary: To calculate the efficiencies of the engine, the equations below were used. Overall engine efficiency is denoted with ( η ) and that is determined by equation (1), where W is work output of the engine and the Q net is the energy of the fuel, Gasoline. (Equation 1) p net Q W , = η Overall thermal efficiency. (Theory,16) Brake thermal efficiency is denoted with ( η ) and is determined by equation(2) , where (b.p.) is brake power, the m f is the mass flow rate, and the Q net is the same as above equation....
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This note was uploaded on 09/08/2010 for the course ME 115 at San Jose State University .

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Lab 2 Gas Engine - Analysis of an Internal Combustion Engine Full Load Performance A report on an experiment performed for ME 115 Thermal

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