. The steam-engine and other heat-motors. iciency of a gas-engine using cubic feet per Witli athermal efficiency of , how many cubic feet of gas will a13 Xl4 engine use making 257 revolutions per minute? Assumea clearance of 20% and a mixture of gas and air in the proportionof 1 to 11, what will be the theoretical temperature and pressureafter an explosion, the piston being on the dead-center? Diesel Cycle.—In this remarkable cycle— 1. The air alone and not the explosive mixture is compressed. 2. The degree of compression exceeds that of all other types. 3. This compression is
. The steam-engine and other heat-motors. iciency of a gas-engine using cubic feet per Witli athermal efficiency of , how many cubic feet of gas will a13 Xl4 engine use making 257 revolutions per minute? Assumea clearance of 20% and a mixture of gas and air in the proportionof 1 to 11, what will be the theoretical temperature and pressureafter an explosion, the piston being on the dead-center? Diesel Cycle.—In this remarkable cycle— 1. The air alone and not the explosive mixture is compressed. 2. The degree of compression exceeds that of all other types. 3. This compression is adiabatic and nothing is done tomake it isothermal. 4. The degree of compression is so great that the tempera-ture causes spontaneous combustion, as the charge or com-bustible is forced in at a higher pressure. 5. Just as powder for cannon is made in grains as large asan inkstand to delay combustion and produce a uniform ratherthan a rapidly diminishing pressure, so in this motor the chargeis supplied gradually for the same Fig. 259. Fig. 260. The indicator-card and entropy diagram are represented inFigs. 193 and 194, but not to scale. The diagrams are lettered to
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