1. Turbulent Diffusive Combustion in CI-DI I C Engines
P M V Subbarao
Professor
Mechanical Engineering Department
I I T Delhi
Full Freedom to the Fuel & Air …..

2. NATURE OF DIESEL COMBUSTION
A/F Ratio: Full load ~19
This ratio is leaner than overall stoichiometric.
A/F ratio: idling ~ 80
Overall Lean but this is not premixed.
It is a Heterogeneous mixture of
– liquid, vapor and air
– spatially non-uniform
Diffusion flame
– High temperature and pressure
– Mixing limited
Highly Turbulent flow

3. Enhanced Turbulence During Fuel Injection to Combustion

4. Imagination of Spatial Variations in CI Engines

5. Regimes of Turbulent Flame
108
Weak Turbulence
Reaction Sheets Da 1
Cyclonic Turbulence
Flamelets in Eddies
Distributed Reactions
10-4
108
ReT

6. Images From Diesel Combustion

7. Incylinder Action & Reactions in CI-DI Engine

8. Multi Cylinder Diesel engines
Diesel built the first diesel engine at the Augsburg Maschinenfabrik .
Rudolph Diesel, filed a patent application
The single cylinder engine was used to power stationary machinery.
It weighed five tonnes and produced 20 hp at 172 rpm!
The engine operated at 26.2% efficiency, a very significant improvement on the 20% achieved by the best gasoline engines of the time.
1922 Benz introduces a 2-cylinder, 30 hp 800 rpm tractor engine.
1924 Benz introduces a 4-cylinder, 50 hp 1000 rpm truck engine.
Peugeot introduced the 404 Diesel followed by the 504 Diesel and the 204 Diesel, the first diesel-powered compact car

9. The world’s biggest engine : Wärtsilä-Sulzer RTA96. :May 2015
14-cylinder, 2-stroke turbocharged Diesel engine.
Weight : 2.3 million kgs
Speed : 102 rpm
powering the Emma Maersk
It has now become cheaper to transport goods from China to a US port than to transport the same goods from a US port to the final destination inland of US by a truck.