1. P M V Subbarao Professor Mechanical Engineering Department
Development of Hardware to Generate Homogeneous Mixtures in S.I. I.C. Engines
P M V Subbarao
Professor
Mechanical Engineering Department
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2. Development of Combustion Science for Eco-friendly SI Engines
Closed Loop
Control
Best Power
Best fuel Economy
CO emissions
HC emissions
NOx emissions

3. The Role of Fuel Induction System
The tasks of the fuel induction systems are;
to introduce right amount of specified schedule.
This schedule must be in agreement with allowable Combustion Mechanism.
to prepare a mixture that satisfies the requirement of the Combustion Mechanism.
This preparation is to be carried out over entire engine operating regime.
In principle, the optimum air-fuel ratio for an engine is that which give the required power output with the lowest fuel consumption.
It should also ensure smooth and reliable operation.

4. Types of Fuel Induction Systems : SI Engines
The fuel Induction systems used in SI engine are classified as:
Carburetors.
Throttle body Fuel Injection Systems.
Multi Point Fuel Injection Systems.
Direct Gasoline Injection System

5. Evolution of Fuel Inductions Systems : SI Engines – First Generation

6. Thermo-flow Model for Carburetor1

7. The Trajectories of Droplets Travelling in Manifolds

8. Evaporation of Droplets
Basic Mechanism : Convective Heat and Mass Transfer
The heat and mass transfer processes during droplet
evaporation are to predicted by suitable models.

9. Models of Droplet Evaporation
Model may assume:
Spherical symmetry of the droplet.
The presence of a quasi-steady gas film around the droplet.
Uniform temperature within the droplet.
Liquid-vapour thermal equilibrium on the droplet surface.
Under these conditions, the rate of temperature change is determined by the energy balance.

10. Droplet evaporation The droplet evaporation rate is given by
where DAB the gas diffusivity,
Sh* the non-dimensional Sherwood number, and
Bm the mass transfer number.
The mass transfer number BM is equal to:
 where Yfs and Yf are the mass fraction of vapor fuel at the droplet surface and the surrounding

11. Fuel Evaporation in Engine Cylinder & Manifolds

12. Development of Combustion Science for Eco-friendly SI Engines
Best Power
Best fuel Economy
CO emissions
HC emissions
NOx emissions

13. Carbureted S.I. Engines
There are some very obscure auto makers, primarily in Africa and Russia, who still build cars with carburetors.
These cars are typically designs that have been purchased from their original manufacturers and remade for a new market.
To keep expenses down, these auto makers avoid computer controls and use mechanical components such as a carburetor on their cars to make them more easily repairable.
Many motorcycles, are one of the last holdouts of the factory production carburetors today.