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

Computational aerodynamics-computer laboratory, A key part of the course is...

A key part of the course is the computer laboratories which will use a package for simulating flow around aerofoils developed by Patrick Hanley . A course licence has been purchase

Assignment Engineering Design 1, Prepare a list of questions that should be...

Prepare a list of questions that should be resolved in identifying each of the following problems: a. Develop an improved manual gearshift for a mountain bike. b. Develop a hands-f

Describe the processes of a cdma system, Question: (a) Describe the spr...

Question: (a) Describe the spreading and dispreading processes of a CDMA system. (b) Autocorrelation properties are used to recover the signals correctly at the receiver. Ex

Gravity, whats the gravitational force?

whats the gravitational force?

Causes of unbalance - aircraft design, Causes of unbalance Unbalance ma...

Causes of unbalance Unbalance may be caused by a variety of factors occurring singly or in combination with others. These factors include:- a) Eccentricity Eccentricity

Aerofoil aerodynamics , We now have some idea about what models are availab...

We now have some idea about what models are available to simulate the flow over an aerofoil, and also how to use the Hanley package to apply these methods. Keep referring to you

Functional checks of chemical de-icing systems, FUNCTIONAL CHECKS OF CHEMIC...

FUNCTIONAL CHECKS OF CHEMICAL DE-ICING SYSTEMS: Once the correct flow rate of the fluid supply has been established the distribution of the fluid flow over the blades should be

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