ICEngineCycles - ME 201 Thermodynamics Piston-Cylinder...

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ME 201 Thermodynamics Piston-Cylinder Cycles (Internal Combustion Engine Cycles) Most internal combustion engines can be modeled as one of three piston/cylinder cycles. At the start of these cycles, the piston is out as far as possible, so that we have the maximum or bottom dead center volume. When the piston is in as far as possible we have the minimum or top dead center volume. Two parameters are used to communicate the size of the engine, Compression ratio: r = V V BDC TDC Engine Displacement: V = V - V number of cylinders disp BDC TDC Piston Stroke: ( 29 4 / D V = L 2 cylinder cylinder disp π An additional parameter used to characterize engine performance is the mean effective pressure (MEP) which is defined as the pressure required to produce the same work output as the engine if the process was isobaric, or W = (MEP) V net disp or MEP = W V V net BDC TDC - The power output of an engine can be calculated from strokes)) of # min/s)(2/( rpm)(1/60 cylinder)( one for (W cylinders)
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ICEngineCycles - ME 201 Thermodynamics Piston-Cylinder...

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