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

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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

please send handwritten solution Q2 part b iv

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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