Post Injection Processes in Diesel Engines

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Presentation transcript:

Post Injection Processes in Diesel Engines P M V Subbarao Professor Mechanical Engineering Department Special Behavioral Issues of Teen Combustion ….

Sizing of Nozzle Instantaneous Diesel Flow rate: Mass of Diesel per cycle:

Fuel Exiting into High Pressure& Temperature Air Enviroment : An unexplored Fluid Mechanics

Boiling in Nozzle due Improper Fluid Mechanics???? Nurick’s Number, K pv is the vapor pressure of the fuel.

Optimal Design of Nozzle Hole

Effect of Nozzle Surface Finish : Distribution of Droplets

Distribution of Droplets in A Spray

Strong Influence of In-Cylinder Conditions on SMD where do is the discharge orifice diameter and FN is the nozzle flow number defined by

Where is the liquid surface tension, L is the liquid viscosity, A is the air density,  L is the liquid density, pL, is the injection pressure differential across the nozzle, is the half spray angle and t is the film thickness, given by

Thermo-Fluid Dynamics of Injection The basic processes are as follows. The fuel injected into a combustion chamber gets divided into many zones. Events in each zone are: droplet break-up, evaporation, air–fuel mixing, ignition, heat release, heat transfer and formation of exhaust emits. Each zone obtains its own zonal temperature and compositions. The mass, internal energy and mole quantity of NOx of each zone are different. The final effect of combustion is cylinder-averaged temperature, air–fuel ratio and NOx concentration.

Simultaneous Occurrence of Multiple Process in CI Engines Start of injection End of injecction -10

Ignition Delay The sum of times required for sub process. The most widely reported correlation relating the ignition delay to the ambient gas condition is given by the relation where τ is the ignition delay, pg and Tg are the ambient gas mean pressure and temperature before autoignition takes place, A, B and n are experimental constants.

Arhenius-type equation for Ignition Delay An Arhenius type equation for Ignition delay is: p :Premixed air fuel ratio.

Symptoms to be Sensed to Predict Auto Ignition

Effect of Gas Temperature on Ignition Delay

Effect of Equivalence Ratio on Ignition Delay

The flammability limits versus the number of carbon atoms in alkanes

Simultaneous Occurrence of Multiple Process in CI Engines Start of injection End of injecction -10