Question

3. In an ideal Diesel cycle, the temperature at the beginning and end of
compression is 65°C and 620°C respectively. The temperature at the
beginning and end of the expansion is 1850°C and 850°C. Determine the
ideal effciency of the cycle. Take y =1.4. If compression ratio is 15 and
pressure at the beginning is 1 bar, calculate the maximum pressure in the
cycle. (5 Marks)​

Answer 1

Answer:

At the start and conclusion of compression in a perfect diesel cycle, the temperatures are 65°C and 620°C, respectively. The expansion's starting and stopping temperatures are 1850°C and 850°C, respectively.

Explanation:

What is the final pressure after compression of a diesel cycle?

Now, the air is gently compressed using the relation P Vk = constant, where k = 1.4, to get it to a final temperature of 77 °C. Calculations based on temperatures and specific heats can be made for input and output energies as well as efficiency: This efficiency can be conveniently expressed in terms of the expansion ratio rE = V1/V3 and the compression ratio rC = V1/V2. The specific heats and temperatures can be used to express efficiency.

Compression, combustion, expansion, and cooling are the four steps of a diesel cycle. Fuel spontaneously ignites when heated by compressed air. A spark plug is absent from a diesel engine. A diesel engine compresses at a ratio of between 14:1 and 25:1, whereas a gasoline engine compresses at a ratio between 8:1 and 12:1.

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