Lab 2 - Gas Engine -Measuring Engine Performance 2008

Lab 2 - Gas Engine -Measuring Engine Performance 2008 -...

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Measuring Engine Performance ME 115 Laboratory Spring 2008
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Otto Cycle Review Cengel & Boles, Thermodynamics: An Engineering Approach, 2006.
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Common terms used to compare engine performance Brake power (bp): net power output of an IC engine Torque: A force acting through a radius RPM: engine speed, in rotations per minute Specific fuel consumption (sfc): rate of fuel consumption per unit of brake power
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Mean Effective Pressure MEP: a fictitious pressure that, if acted on the piston during the entire power stroke, would produce the same amount of net work as that produced during the actual cycle If the MEP goes up, the cylinder volume can go down and still achieve the same power output
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Mean Effective Pressure, cont. Indicated MEP (imep): uses the total power output minus the power needed for the intake and exhaust stokes (indicated power) Brake MEP (bmep): the power used to overcome friction in the cylinder is also subtracted; this term is used more often than the imep
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This note was uploaded on 09/08/2010 for the course ME 115 at San Jose State.

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Lab 2 - Gas Engine -Measuring Engine Performance 2008 -...

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