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 A Baby Care Engineering for A Quick & Comprehensive Phenomenon…...

Development of Combustion Science for Eco-friendly SI Engines Closed Loop Control Best Power Best fuel Economy CO emissions HC emissions NOx emissions

The Role of Fuel Induction System The tasks of the fuel induction systems are; to introduce right amount of fuel @ 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.

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

Evolution of Fuel Inductions Systems : SI Engines – First Generation

Thermo-flow Model for Carburetor 1

The Trajectories of Droplets Travelling in Manifolds

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.

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.

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

Fuel Evaporation in Engine Cylinder & Manifolds

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

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.