A six cylinder four stroke diesel engine operates at air fuel ratio of 20:1. The diameter and stroke of the cylinder are 100 mm and 140 mm respectively. The volumetric efficiency is 80%. The condition of air at the beginning of compression are 1 bar and 27°C. Determine the maximum amount of fuel that can be injected in each cylinder per second. If the speed of the engine is 1500 RPM, injection pressure is 150 bar, air pressure during fuel injection is 20 bar and the fuel injection is carried out for 20 degrees of crank rotation, determine the diameter of fuel nozzle.

Given data:

4-stroke engine, no.of cylinders=k=6,

A/F=20, D=0.1m, L=0.14m

P=100 kPa, T=300 K, N=1500 rpm,

i. Max. amount of fuel injected per cylinder per second

The engine completes 12.5 cycles in 25 revolutions or 1 second

ii. Diameter of fuel orifice

We know, velocity of fuel jet =

Assume and

Substituting values in equation (a) we get,