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Answer to Question #116959 in Mechanical Engineering for Curtis
Question #116959
A single cylinder petrol engine has a volume compression ratio of 4:1, takes in a mixture of fuel and air at a temperature of 20°Cand its pressure is 101kPa. If the pressure at the end of the compression stroke is 1.5MPa what will be its final temperature?
Expert's answer
The problem involves an adiabatic compression, therefore the governing equation will be
and also,
Considering two states, using the first equation:
Now it’s possible to use the second equation
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A compressed air storage cylinder has a volume of 0.5m^3 and contains air at an absolute pressure of 1.8MPa and temperature 20°C. A quantity of the air is released during which the temperature of the remaining air falls to 15°C and the pressure to 1.5MPa. Calculate the mass of the air released. The characteristic gas constant for air is 287Jkg−1K^−1.
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