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Homework Help: Ideal Diesel Cycle Help?

  1. Aug 3, 2007 #1
    Ideal Diesel Cycle Help??

    1. The problem statement, all variables and given/known data

    A 5-liter 10 cylinder, 4 stroke engine to produce 550kw at 12000rpm. Compression ratio 18, cut-off ratio 2.5. Air enters with 280K and 170Kpa, after passing two-stage turbo charger and intercooler. Using variable specific heats.

    (a) find gas temperature after combustion
    (b) the approximate rate of consumption of diesel fuel
    (c) the air-fuel ratio
    (d) the volumetric efficiency of the engine.

    2. Relevant equations

    LHV(diesel)=43.1 Mj/kg

    3. The attempt at a solution

    I have solved part (a), what formulas do ii have to use for the rest of the parts.
  2. jcsd
  3. Aug 5, 2007 #2


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    Staff Emeritus
    Science Advisor

    One should have some value for the 'heat or energy content' (kJ/kg or Btu/lbm) of the diesel fuel in order to approximate the rate of consumption of diesel fuel.

    Then with the mass flow rate of air and mass flow rate of fuel . . . .

    What does one's textbook mention in regard to fuel energy content? Presumably there are examples of fuel consumption calculations.
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