# Homework Help: Ideal Diesel Cycle Help?

1. Aug 3, 2007

### moiznabi

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. Aug 5, 2007

### Astronuc

Staff Emeritus
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.