. The Street railway journal . tions. Thenlet it be assumed that the turbine in question was subject tono other losses than the power required to revolve the rotorin the atmosphere of steam and turn the shaft in the this case, the curve of steam consumption would be parallelto curve A, but would intersect the base line at a point, then would be the curve for this tuibine. Now, however, letit be assumed that the turbine had ideal bearings and no powerwas lost in turning the rotor in the steam, other losses, suchas leakage, friction of the steam in the buckets and guides andthe l
. The Street railway journal . tions. Thenlet it be assumed that the turbine in question was subject tono other losses than the power required to revolve the rotorin the atmosphere of steam and turn the shaft in the this case, the curve of steam consumption would be parallelto curve A, but would intersect the base line at a point, then would be the curve for this tuibine. Now, however, letit be assumed that the turbine had ideal bearings and no powerwas lost in turning the rotor in the steam, other losses, suchas leakage, friction of the steam in the buckets and guides andthe loss in final velocity being present. Since the steam con-sumption would be greater, though proportional to the load,the curve would be located like curve C, intersecting the baseline at zero. Finally, now, let the turbine be that of curve B,except that it is also subject to all the losses which turbineshave; that is, the losses represented by curve C. If, then, theturbine in question has the losses of curves B and C, the curve. Hoise Power FIG. 3.—TURBINE STEAM CONSUMPTION DIAGRAM of steam consumption will be a straight line, passing throughX parallel to C. The true significance of the steam con-sumption curve is then (1), that the distance of its intersectionfrom zero represents the power lost in the friction of the bear-ings, windage of the armature and frictional resistance of therotor from being revolved in an atmosphere as steam; and (2)that the inclination of the curve to the base line is a measureof the loss by leakage, friction of the steam on the buckets,loss by final velocity, radiation, etc. This one curve, therefore,tells at a glance everything that is to be known about the per-formance, and the writer would suggest that when summing upthe performance of a turbine by a curve, the theoretical steamconsumption line be also drawn, by the aid of which a simpleinspection of the curve sheet would illustrate the lossesgraphically, and show where they occurred and their m
Size: 1795px × 1392px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
