. Applied thermodynamics for engineers. r; thevolumes in the cylinders alone are measurable out to fC. In Fig. 209, lay off hi = lCand jk so thai jk-i-hi is equal to the ratio of volumes of low- and high-pressure 330 APPLIED THERMODYNAMICS cylinder. At the point C of the cycle, the high-pressure crank is at i, the low-pres-surecrank 90° ahead or behind it. When the high-pressure crank has moved fromi to m, the volume of steam in that cylinder is represented by the distance hn, thelow-pressure crank is at o and the volume of steam in the low-pressure cylinder isrepresented by pk. Lay off qr, in
. Applied thermodynamics for engineers. r; thevolumes in the cylinders alone are measurable out to fC. In Fig. 209, lay off hi = lCand jk so thai jk-i-hi is equal to the ratio of volumes of low- and high-pressure 330 APPLIED THERMODYNAMICS cylinder. At the point C of the cycle, the high-pressure crank is at i, the low-pres-surecrank 90° ahead or behind it. When the high-pressure crank has moved fromi to m, the volume of steam in that cylinder is represented by the distance hn, thelow-pressure crank is at o and the volume of steam in the low-pressure cylinder isrepresented by pk. Lay off qr, in Fig. 208, distant from the zero volume hne alby an amount equal to hn-\-pk. Draw the horizontal line ts. Lay off tu = hn andtv = us = pk. Then w is a point on the high-pressure exhaust line and v is a pointon the low-pressure admission hne. Similarly, we find corresponding crank posi-tions w and X, and steam volumes hy and zk, and lay off AB = hy+zk, Ac = hy,AD = cB = zk, determining the points c and D, The high-pressure exhaust line. Fig. 208. Arts. 477-479.—Ehmination of Drop, Cross-compound Engine. guc is continued to some distance below I. For no drop, this Hne must terminateat some point such that compression of steam in the high-pressure cyhnder andreceiver will make I the final state. At I the high-pressure cylinder steam volumeis zero; all the steam is in the receiver. Let IE represent the receiver volumeand EF a hyperboHc curve. Draw IG so that at any pressure its volumes are equalto those along EF, minus the constant volume IE. Then H, where IG intersectsguc, is the state of the high-pressure cycle at which cut-off occurs in the low-pressurecj^hnder. By drawing a horizontal line through H to intersect vD, we find the pointof cut-off J on the low-pressure diagram. If we regard the initial state as that whenadmission occurs to the low-pressure cyhnder, then at low-pressure cut-off the high-pressure cyhnder will have completed the —- proportion of a full stroke. Mo
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