• Card 14 / 35: A reciprocating, spark ignition engine takes in an air-fuel mixture at 20°C. It has a compression ratio of 12. The air-to-fuel ratio is 14, and the heating value of the fuel is 70,000 kJ/kg. For an air standard cycle analysis, what is the highest pressure reached? You may assume Cv is approximately 0.7 kJ/kg K and that k=Cp/Cv = 1.4.
    A) 2.34 atm
    B) 50 atm
    C) 23.4 atm
    D) 234 atm
    E) 325 atm

    Answer:
    E) 325 atm

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Explanation:

For this problem, we simply use the ideal gas law. We know the initial condition of 293°K and 1 atm. If we assume that air is the working fluid, then P = Pinitial (Vinitial/Vfinal) (Tfinal/Tinitial) = 1atm (12)(7934/293) = 325 atm.

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Thermal-Fluid Systems ME303

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Attribution:  Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/
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