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Internal Combustion Engine (ICE) Performance

Internal Combustion Engine (ICE) Performance. ME 252 Thermal Fluid Systems G. Kallio. ICE Performance Measures. Indicated work & power – work based upon the recorded cylinder P vs. V diagram (Otto ideal work) where: W cycle,net = net work per cylinder per complete cycle

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Internal Combustion Engine (ICE) Performance

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  1. Internal Combustion Engine (ICE) Performance ME 252 Thermal Fluid Systems G. Kallio

  2. ICE Performance Measures • Indicated work & power – work based upon the recorded cylinder P vs. V diagram (Ottoideal work) • where: Wcycle,net = net work per cylinder per complete cycle n = number of cylinders  = crankshaft rotational speed (rev/s) N = number of crankshaft revolutions per complete cycle (= 2 for 4-stroke, = 1 for 2-stroke)

  3. ICE Performance Measures, cont. • Mean effective pressure (mep) – the average pressure, if acted upon by the piston during the entire power stroke, that would produce the actual net work • Brake work & power – output of engine under load, usually measured at flywheel by a dynamometer; it is less than indicated power due to friction and parasitic loads

  4. ICE Performance Measures, cont. • Mechanical efficiency (m) • Volumetric efficiency (v)

  5. ICE Performance Measures, cont. • Specific fuel consumption (sfc)

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