Applying Laws of Mechanics (Physics) to the Internal Combustion Engine

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Presentation transcript:

Applying Laws of Mechanics (Physics) to the Internal Combustion Engine Engine Terminology Applying Laws of Mechanics (Physics) to the Internal Combustion Engine Lesson 3 March 2008

Mass What state of matter is the engine?

Force What is the definition of Force?

Push or pull (force) which starts, stops or changes motion of a body What force is exerted on the piston?

What is the definition of Work? When a body is moved by a force How can we apply this to an engine? What parts are doing the work?

Relationship to Work Work = Distance Moved x Force Applied

What is Torque? Turning or twisting force that causes a body to turn (rotate). What part is turning in the engine?

Relationship of Torque Torque = Length x Force Applied

Rate (Time - Speed) of doing work. Power Rate (Time - Speed) of doing work. Power = Distance (ft) x Force (lbs) Time (minutes)

Relationship to Power – Horse Power (HP will be discussed in more detail in Lesson 7) IHP (Indicated Horse Power) -measurement of mechanical power produced from combustion cycle. BHP (Brake Horse Power) -measurement of mechanical power at crankshaft.

Energy

An engine uses chemical matter (gas and air) in a pre-determined mass (air-fuel ratio) to produce energy (heat) through the process of combustion. The expanding force (pressure) of these hot gasses, creates work through the momentum (motion) of various mechanical components

Air Fuel Charge Which form of energy is this?

Combustion Which form of energy is this?

The Combustion Process Combustion is a controlled rapid burn (process) of gasses in a contained environment (combustion chamber). The energy (heat) of the expanding hot gases (pressure), is the harnessed ‘force’ used to do ‘work’.