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Publish On: 2019-05-08

Ben joy

Total Post: 542

Question: Show the construction and working of gasoline and diesel engines

Reply On: 2014-02-01

lala singh

Total Post: 22

ANS: Show the construction and working of gasoline and diesel engines

In the common gasoline engine four processes take place in each cycle. For computation of the efficiency, these processes can be represented approximately by the Otto cycle. Starting with the piston at the top of its stock, a an explosive mixture of air gasoline vapor is compressed adiabatically in the cylinder to point b, heated by combustion to point c, allowed to expand adiabatically with performance of external work to point d, and cooled at constant volume to point a during the exhaust stroke. The ratio V1/V2 is called the compression ratio and is about 8 in automobile engines.

The work output is represented by the shaded area. The heat inputs is Q1, and the exhaust heat input and the work output can be computed in terms of the compression ratio; then
                 


An idealized cycle for a diesel engine is shown. Starting at a, air is compressed amiability to b at which point fuel oil is injected and starts to burn at approximately constant pressure, b to c. The remainder of the power stock is an adiabatic expansion of d. During the exhaust stroke the gas cools at constant volume exhaust is to a. Because there is no fuel in the cylinder during compressing, the compression ratio V1/V2 can be larger than in gasoline engine; it is usually about 15. The ratio V1/V3 may be about 5. Using these values, one could compute the diesel efficiency to be about the same as that for a gasoline engine.

 

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