Diesel engines for land and marine work . In order to bring these out more clearly refer-ence may be made to Figs. 168 and 169, which illustratethe cycles of the valve and port scavenging engine re-spectively. Follomng the indicator diagram in Fig. 168 fuel injectioncommences at c and continues at more or less constantpressure to h when the supply is cut off and expansion pro-ceeds along the line h, a, until at a the exhaust ports areuncovered by the piston in its outward stroke. From a toe the pressure drops rapidly, reaching approximately atmo-spheric at e when the scavenge valve in the cyli
Diesel engines for land and marine work . In order to bring these out more clearly refer-ence may be made to Figs. 168 and 169, which illustratethe cycles of the valve and port scavenging engine re-spectively. Follomng the indicator diagram in Fig. 168 fuel injectioncommences at c and continues at more or less constantpressure to h when the supply is cut off and expansion pro-ceeds along the line h, a, until at a the exhaust ports areuncovered by the piston in its outward stroke. From a toe the pressure drops rapidly, reaching approximately atmo-spheric at e when the scavenge valve in the cylinder coveropens, and the cylinder is filled with scavenging air alongef and then back along /e, the scavenging valve closingapproximately at the same time (usually just before) asthe exhaust ports are covered. Compression then followsfrom d to c and the cycle recommences. It will therefore be seen from this diagram that what maybe termed the useful stroke is from m to d or x, whilstthe total stroke is represented by mf or y. In ordinary. Fig. 1G8.—Diesel Engine Indicator Diagram with Valve Scavenging.] 331 ^^abaat yi
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkdvannostran
