Difference Between otto and diesel cycle

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Presentation transcript:

Difference Between otto and diesel cycle BY: JAIN NIKHIL PRAKASH Automobile Engg. Dept. Division E

OTTO CYCLE Nicolaus was a German inventor Born in 1832 in Holzhausen an der Haide His design was the first 4 stroke ICE to have any kind of practicality

DIESEL CYCLE Invented by Rudolf Christian Karl Diesel in 1893 First engine was powered by powdered coal Achieved a compression ratio of almost 80 Exploded, almost killed Diesel First working engine completed 1894 - generated 13 hp

WORKING OF OTTO CYCLE Any 4 stroke engine is an Otto Engine The 4 strokes are: Intake, Compression, Combustion/Power, Exhaust. The cycle is: 1-2: adiabatic compression 2-3: heat addition at constant volume 3-4: adiabatic expansion and rejection of heat at constant volume

Working Process 1-2 Piston moves from crank end to cylinder head end (TDC, top dead centre and minimum volume) as the working gas with initial state 1 is compressed isentropically to state point 2, through compression ratio Process 2-3 The piston is momentarily at rest at TDC. During this instant, which is known as the ignition phase, the air/fuel mixture remains Process 3-4 The increased high pressure exerts a force on the piston and pushes it towards the BDC. Process 4-1 The piston is momentarily at rest at BDC

DIESEL HOW LOOKS ?

WORKING OF DIESEL CYCLE Fuel injected at TC A I R Air Combustion Products Actual Cycle Intake Stroke Compression Stroke Power Stroke Exhaust Stroke Qin Qout Air Diesel Cycle BC Compression Process Const pressure heat addition Process Expansion Process Const volume heat rejection Process

Working Process 1 to 2 is isentropic compression of the fluid (blue) Process 2 to 3 is reversible constant pressure heating (red) Process 3 to 4 is isentropic expansion (yellow) Process 4 to 1 is reversible constant volume cooling (green)

DIFFERENCE BETWEEN OTTO AND DIESEL Uses In diesel engines, heating systems In petrol engines Made from Petroleum/ Crude oil Petroleum/ Crude Oil Energy content 38.6 MJ/litre 34.6 MJ/litre Made by Fractional distillation Torque (for 10L engine) 1000 Nm @ 2000 rpm 300Nm @ 4000 rpm Power (for 10L engine) 490Hp @ 3500 rpm 600Hp @ 5500 rpm Power = torque*RPM 210°C 246°C CO2 emission More than gasoline(petrol). Diesel fuel produces approximately 13% more CO2 gas per gallon of fuel burned, compared to gas (petrol) engines. Lower than diesel.

DIFFERENCE BETWEEN OTTO AND DIESEL

Production of petrol vs diesel Petroleum is refined to produce petrol and diesel. Fractional Distillation process is used on petroleum and at various temperatures, different by products are formed from it. Petrol and diesel both are derived at varying temperatures during refining process. Petrol is produced at temperature between 35 degrees to 200 degrees while diesel is produced at a boiling point of 250-350 degrees. After distillation, in order to use these byproducts as commercially acceptable petrol and diesel, some blending with other elements has to be done. Petrol is produced first in this process as it is produced at a lower temperature than diesel.

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