Diesel Engine Essay

863 Words 4 Pages
Literature review
Diesel engine was invented by Dr Rudolfh diesel . In 1982 he presented the diesel engine in which ignition of fuel is by compression which was completely different from gasoline engine and steam engine ,this engine had many advantages over the other engines like low fuel consumption and could be designed for higher power outputs .In 1922 Sir Robert Bosch Developed a fuel injection system for the engine . those fuel injection pumps were a step ahead in having higher speed in diesel engine. In 1936, Mercedez benz was first car production with 2580 cc and 50 hp with diesel engine .In diesel engine instead of spark plug and carburetor there is a fuel injector . In the diesel engine when fuel is injected in the combustion
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In diesel engine there is only air during the compression stroke which excludes the chances of auto ignition .therefore the diesel engine can work on high compression ratio .the principle of working of diesel engine depends on the heat of compressed air which will start combustion of fuel charge .due to combustion the energy is converted from one form to another which could be used to power tractors
In diesel engine there is more complete burning of fuel compared to gasoline engine since its rpm is low also it has higher fuel mass ratio.Also greater fuel economy and cheap fuel compared to gasoline engine is the apprehension behind use of diesel engine in large ships and for power generation

Viscosity
Viscosity is defined as fuel adhesiveness or cohesiveness and it plays the main role in estimation of temperature for injection of fuel
Comparison of viscosity of diesel ,biodiesel and vegetable oil
Type Calorific value Kinematic viscosity Flash point (degree celcius)
Diesel 427 1-4 80
Bio diesel 372 4-6 100
Sun flower oil 371 66 316
Soya oil 371 63.5 359
Rapeseed oil 376 74
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Initially there is large liquid droplets at the nozzle exit .these ligaments break down into liquid phase further downstream the breakdown process goes on and along with time more surrounding gas is put up in the spray region
This would lead to different behaviour with a characteristic spray angle. The system after the thick zone are thin zone and dilute zone
In hot environment the position at which all liquid evaporates is called liquid length .from experiments this length is found to be constant after some time .after that time the evaporated fuel continues to penetrate the surrounding gas and is defined as vapour

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