the diesel cycle robert amirault objective: to establish the function, pros and cons and uses of a...
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The Diesel Cycle
Robert Amirault
Objective: To establish the function, pros and cons and uses of a diesel engine.
Gasoline Engine
• Burns unleaded refined gasoline
• Lower compression ratio (8:1 to 12:1)
• Subject to “knocking” at high compression
• Mixes the fuel before injection
• Uses spark plugs
Diesel Engine
• Burns less refined diesel fuel
• High compression ratio (14:1 to 25:1)
• Low risk of “knocking” easy to turbo charge and supercharge
• Relies only on pressure to ignite fuel
• Uses glow plugs (larger engines do not)
• Injects the fuel directly into the cylinder
Benefits
• More energy is contained in diesel fuel– One gallon of diesel contains 155 MJ– One gallon of gasoline contains 132 MJ
• More efficient
• Cheaper fuel
Drawbacks
• More expensive to manufacture
• Noisier
• More pollutant
• Low acceleration due to high torque
• Required to run at lower RPM
The Diesel Cycle
• Definition– The diesel cycle is the combustion process of a type of internal
combustion engine in which the burning of the fuel is triggered not by a spark plug as in the Otto cycle, but rather by the heat generated in compressing the fuel-air mixture.
• Four parts– Intake– Compression– Injection/combustion– Exhaust
The Engine
• The dissected engine was a gasoline engine
• The spark plug shows that it is not diesel
• Diesel engines are most often found in large trucks, boats, trains and anything requiring a lot of power without much speed.
References• http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/diesel.html• http://www.google.ca/search?hl=en&lr=&safe=off&rls=GGGL,GGGL:2005-
09,GGGL:en&oi=defmore&defl=en&q=define:Diesel+cycle• http://auto.howstuffworks.com/diesel1.htm