OTTO ENGINE CYCLE

HISTORY

• Nicolaus Otto One of the most important landmarks in engine design comes from Nicolaus Otto who in 1876 invented an effective gas motor engine. Nicolaus Otto built the first practical four-stroke internal combustion engine called the "Otto Cycle Engine," and when he completed his engine, he built it into a motorcycle.
• The Otto Engine was dicovered in Paris
• In 1861 Nicolaus Otto built his first engine
• The engine was first used in a motorcycle
• Some variants maybe the Four stroke Combustion Engine and the Internal Combustion Engine

OTTO ENGINE OPERATION

• The thermal energy source is heat
• The working fluid is air
• Open Cycle
• http://wright.nasa.gov/airplane/Images/otto.gif
• Increase the temperature difference in the heat engine.

OPERATION CONT'D

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• Exploits the physical properties of the working fluid
• Exploit the chemical properties of the working fluid.

EFFICIENCY OF AN IDEAL OTTO CYCLE

• The starting point is the general expression for the thermal efficiency of a cycle:
• The convention, as previously, is that heat exchange is positive if heat is flowing into the system or engine, so is negative. The heat absorbed occurs during combustion when the spark occurs, roughly at constant volume. The heat absorbed can be related to the temperature change from state 2 to state 3 as:
• The heat rejected is given by (for a perfect gas with constant specific heats)
• Substituting the expressions for the heat absorbed and rejected in the expression for thermal efficiency yields

APPLICATIONS

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• They are used in mostly airplanes

ADVANTAGES AND DISADVANTAGES

• It is a very simple cycle that can be applied to a great variety of uses. It is easily scalable. It is thermally quite inefficient. Too much fuel is wasted as unused. The power application is not uniform throughout the combustion cycle. Pressure differential between air intake and exhaust is needed, too much back pressure, the cycle is compromised.
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CREDITS

• Inventors- Ask.com
• NNDB
• Otto Cycle Wikipedia
• NASA