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VikaD [51]
3 years ago
14

What is compression ratio of an Otto cycle? How does it affect the thermal efficiency of the cycle?

Engineering
1 answer:
GuDViN [60]3 years ago
6 0

Answer:

r= \dfrac{V_1}{V_2}

\eta =1-\dfrac{1}{r^{\gamma-1}}

Explanation:

Compression ratio:

   Compression ratio is the ratio of volume in the cylinder.Generally it is denoted by r.

The compression ratio for Otto cycle is about 8 to 12.But the compression ratio of diesel engine is about 14 to 25.

So from the Otto cycle compression ratio can be define as

r= \dfrac{V_1}{V_2}

As we know that efficiency defines as the ratio of work out to the heat input.In the Otto cycle the efficiency is given as in terms of compression ratio r as

\eta =1-\dfrac{1}{r^{\gamma-1}}

Where γ is the heat capacity ratio.

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