Four stroke diesel engine, Other Engineering

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.

 

 

Posted Date: 7/21/2012 8:46:18 AM | Location : United States







Related Discussions:- Four stroke diesel engine, Assignment Help, Ask Question on Four stroke diesel engine, Get Answer, Expert's Help, Four stroke diesel engine Discussions

Write discussion on Four stroke diesel engine
Your posts are moderated
Related Questions
This Compression After Impact (CAI) test fixture was developed by the Boeing Company. The specimen, typically, but not necessarily, a quasi-isotropic laminate, is 6" long, 4" wide,

WHY VOLTAGE GENERATED IN MULTIPLES OF 11

How to draw schiography in a perspective view of an object

EL DESPLAZAMEINTO DE UNA PARTICULA ESTA DADO POR S=(-2+3T)e¨-0.5t


how to design a circural form tool on drawing sheet?

analyse modelling for safe home security system

WHAT IS ZENER DIAOD?

WORKING OF I.C. ENGINE Basically there are 2 types of internal combustion engines; the two stoke type and the 4-stroke type. A brief description of these is given below: 1.

As an engineering student, the ministry of energy and minerals has tasked you to help them model equation(s) that can estimate the amount of crude oil in a reservoir. The governmen