(b) A diesel engine has a compression ratio of 18 and a cut off ratio of 2.4. At the beginning of the compression process, the air in the cylinder is at 100kPa and 27°C. Assume the gas constant, R = 287J/kgK, the specific heat at constant volume, Cy = 718J/kgk, and the ratio of specific heats,= 1.4. Calculate; i The temperature after the heat addition process
(b) A diesel engine has a compression ratio of 18 and a cut off ratio of 2.4. At the beginning of the compression process, the air in the cylinder is at 100kPa and 27°C. Assume the gas constant, R = 287J/kgK, the specific heat at constant volume, Cy = 718J/kgk, and the ratio of specific heats,= 1.4. Calculate; i The temperature after the heat addition process
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please send handwritten solution Q2 part b i
Transcribed Image Text:2. (a) Define the physical processes which comprise the four stroke
cycle AND Define the thermodynamic processes of the air stan-
dard cycle which comprise the Otto cycle.
(b) A diesel engine has a compression ratio of 18 and a cut off ratio
of 2.4. At the beginning of the compression process, the air in
the cylinder is at 100kPa and 27°C. Assume the gas constant,
R = 287J/kgK, the specific heat at constant volume, Cy
718J/kgk, and the ratio of specific heats,= 1.4. Calculate;
i The temperature after the heat addition process
=
ii The maximum pressure in the cylinder
iii The work done by the cycle per unit mass
iv The thermal efficiency of the engine
v The mean effective pressure
(c) Describe, using fewer than 50 words each what is meant by the
following terms describing diesel engine combustion;
i Delay Period.
ii Uncontrolled burning.
iii Controlled burning.
iv Cut off ratio.
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