Four stroke diesel engine, Other Engineering

Assignment Help:

FOUR STROKE DIESEL ENGINE:

The cycle of events that takes place in a four -stroke diesel engine has been shown. Unlike the petrol which drawn in a mixture of air and petrol, only air from the atmosphere is inducted into the diesel engine cylinder, through the inlet valve, during the suction stroke. This air is then compressed to about 1/22 of its original volume, which raised its temperature. The average automotive diesel engine has a compression ratio of 22:1 and a cranking compression pressure of 2.8Mpa. For every piston is at the top dead centre, the fuel is injected into the cylinder. The raised temperature of the compressed air is sufficient to ignite the fuel. There is an increase in pressure which drives the piston down giving working stroke. The exhaust valve opens at the end of the working stroke and the exhaust gases are driven out as the piston ascends. The combustion in a diesel occurs in four stages. These stages are going on simultaneously in different parts of the combustion chamber during injection of fuel.

(1)         Delay period, in which the fuel injected into the cylinder changes from liquid to vapour phase.

(2)         Uncontrolled burning of the fuel already injected into the combustion chamber.

(3)         Controlled burning as the injector continues to feed fuel into the combustion chamber.

(4)         After burning, which is the period for which the fuel remaining in the combustion chamber after the injection stops continues to burn? The amount of fuel injected into the combustion chamber determines the power developed in a diesel engine. Increasing the amount of fuel injected increase the engine speed or torque. The maximum amount of fuel depends upon the amount of air inducted in the intake stroke. However, the fuel injected is limited by a governor, which is usually set to provide fuel so as to result in maximum enrichment of about 10:1 by weight.

 

 


Related Discussions:- Four stroke diesel engine

Resistive transducers, Resistive transducers Linear or rotary potentiom...

Resistive transducers Linear or rotary potentiometers can be adapted to measure displacement, possibly through mechanical gearing and linkages. The displacement is registered a

Compacting or briquetting, The operation of heating a green compact to an e...

The operation of heating a green compact to an elevated temperature is known as sintering. It is a process by which solid bodies are bonded by atomic forces. It is carried out belo

Vehicle handling and control, Your objective in this lab is to convince the...

Your objective in this lab is to convince the assessor that you understand the basic concepts of how shock absorbers affect the ride and handling of a vehicle.  This will involve d

Protected escape routes - means of escape, Protected escape routes - fire p...

Protected escape routes - fire protection engineering: Protected escape routes: Does the fire resistance fully enclose the protected routes? Do the fire doors

Financial leverage Multiplayer , How i can have the FLM if i dont have the ...

How i can have the FLM if i dont have the Total Assets or Shareholders Equity

Design of casting, Design of Casting : The important factors to keep in mi...

Design of Casting : The important factors to keep in mind when designing a casting to obtain maximum strength and minimum casting includes :             1. Design for direction

Applied Physics, what types of fringes will be formed if white light is use...

what types of fringes will be formed if white light is used in a Michelson''s interferometer

syed, risks involved in moving from a project-centric mode to a mix of pro...

risks involved in moving from a project-centric mode to a mix of projects and

Thermodynamics, original temp. of plate is 25 degree c.when put in burnace ...

original temp. of plate is 25 degree c.when put in burnace its upper part is 250 c and lower is 100 and mass is 56kg.find out heat transfer

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd