Ideal Diesel Cycle Calculations

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SUMMARY

The discussion focuses on calculations related to an Ideal Diesel Cycle for a 5-liter, 10-cylinder, 4-stroke engine designed to produce 550 kW at 12,000 RPM. Key parameters include a compression ratio of 18 and a cut-off ratio of 2.5, with air entering at 280 K and 170 kPa after a two-stage turbocharger and intercooler. The participants aim to determine the gas temperature after combustion, diesel fuel consumption rate, air-fuel ratio, and volumetric efficiency using the lower heating value (LHV) of diesel fuel, which is 43.1 MJ/kg.

PREREQUISITES
  • Understanding of Ideal Diesel Cycle thermodynamics
  • Familiarity with engine performance metrics
  • Knowledge of specific heat calculations
  • Proficiency in using thermodynamic equations for fuel consumption
NEXT STEPS
  • Calculate gas temperature after combustion using the Ideal Diesel Cycle equations
  • Determine diesel fuel consumption rate using mass flow rate and LHV of diesel
  • Analyze air-fuel ratio calculations for diesel engines
  • Evaluate volumetric efficiency using engine performance parameters
USEFUL FOR

Mechanical engineers, automotive engineers, and students studying thermodynamics or engine performance who are involved in diesel engine design and analysis.

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Ideal Diesel Cycle Help??

Homework Statement



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.


Homework Equations



LHV(diesel)=43.1 Mj/kg


The Attempt at a Solution



I have solved part (a), what formulas do ii have to use for the rest of the parts.
 
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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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