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

Dsd subject, give me basic programming of vhdl

give me basic programming of vhdl

Heat transfer, #questionA piece of Al weighing 6 kg and initially at a temp...

#questionA piece of Al weighing 6 kg and initially at a temperature of 300OC is suddenly immersed in a fluid at a temperature of 20OC. The convectice heat transfer coefficient is 5

Fire evacuation signals, Fi r e evacuation signals: Members of the ...

Fi r e evacuation signals: Members of the public are known not to respond positively to fire evacuation signals. People will often try to ignore the signal and will try to

Process control, what is the input to a process control system?

what is the input to a process control system?

Barometric lag, My question is that i am working in a petrochemical plant w...

My question is that i am working in a petrochemical plant where in final stage disc ring reactor the barometric lag is chocked completely the system is under vacuum if i introduce

Visualizing data matlab, expertsmind.com has Visualizing Data solution in ...

expertsmind.com has Visualizing Data solution in matlab All the design features that are required to picture technological innovation and clinical information are available in

Switching, name the switching schemes used in a digital exchange. how call ...

name the switching schemes used in a digital exchange. how call processing takes place?

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