. Applied thermodynamics for engineers. Fig. 212. Art. 466. — CombinedDiagrams for Cylinder Feed. 467. Combined Diagrams. Figure 205 showsthe ideal diagrams from a tandem receiver CD, as along CD in Fig. 203, expansion into the low-pressure cylinder is taking place. The corresponding hne on the low-pressure diagram is EF. At F the supply of steam is cut off from the low-pressurecylinder, after which hyperbohc expansion occurs along FS. Meanwhile, the. —T-1 iS ao i 1- i3 rSvs^^^ Fig. 205. Arts. 467, 475.—Elimination of Drop, Fig. 214. Art. 468.—Effect of Low-Tandem Receiver Engine.
. Applied thermodynamics for engineers. Fig. 212. Art. 466. — CombinedDiagrams for Cylinder Feed. 467. Combined Diagrams. Figure 205 showsthe ideal diagrams from a tandem receiver CD, as along CD in Fig. 203, expansion into the low-pressure cylinder is taking place. The corresponding hne on the low-pressure diagram is EF. At F the supply of steam is cut off from the low-pressurecylinder, after which hyperbohc expansion occurs along FS. Meanwhile, the. —T-1 iS ao i 1- i3 rSvs^^^ Fig. 205. Arts. 467, 475.—Elimination of Drop, Fig. 214. Art. 468.—Effect of Low-Tandem Receiver Engine. pressure Cut-off, exhaust from the high-pressure cyhnder is discharged to the receiver; and since aconstant quantity of steam must now be contained in the decreasing space betweenthe piston and the cylinder and receiver walls, some compression occurs, givingthe line DE. The pressure of the receiver steam remains equal to that at Eafter the high-pressure exhaust valve closes (at E) and while the high-pressurecylinder continues the cycle along EABC. If the pressure at C exceeds that atE, then there will be some drop. As drawn, the diagram shows none. If cut-ofTin the low-pressure cylinder occurred later in the stroke, the line DE would belowered, Pc would exceed Pe, and drop would be shown. An incidental advantage of the receiver engine is here evident. The intro-duction of cut-off in the low-pressure cylinder raises the lower limit of tempera- 324 AP
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