. Applied thermodynamics for engineers. nded from tlie entropydiagram, ahfd. Fig. 124. As the width of the cycle decreases (hfmoving toward ac?), the efficiency increases. 307 6. Diesel Cycle with PressureConstant. In common present practice,the engine is supplied with fuel at such a rate that the pressure, ratherthan the temperature, is kept constant during combustion. This gives amuch greater work area, in a cylinder of given size, than is possible withisothermal combustion. The cycle is in this case as shown in Fig. 132 a,combining features of those of Otto and Bray ton. The entropy diagram
. Applied thermodynamics for engineers. nded from tlie entropydiagram, ahfd. Fig. 124. As the width of the cycle decreases (hfmoving toward ac?), the efficiency increases. 307 6. Diesel Cycle with PressureConstant. In common present practice,the engine is supplied with fuel at such a rate that the pressure, ratherthan the temperature, is kept constant during combustion. This gives amuch greater work area, in a cylinder of given size, than is possible withisothermal combustion. The cycle is in this case as shown in Fig. 132 a,combining features of those of Otto and Bray ton. The entropy diagramshows that the efficiency exceeds that of the Otto cycle ebfd between the THE DIESEL ENGINE 187 same limits; but it is less than that of the Diesel cycle with isothermalcombustion. The definite expression for efficiency is ahfdmabn 1 l(Tr-T,) 1- ^ Inspection of the diagram shows that the efficiency decreases as the loadincreases. (For a description of the Junkers engine^ see the papers by Junge, inPower, Oct. 22, 29, Nov. 5, 1912.) P T.
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