Indicator practice and steam-engine economy. With plain directions for attaching the indicator. taking diagrams .. by Hemenway Frank F

Author:Hemenway, Frank F. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Indicators for steam-engines. [from old catalog]
Publisher: New York, J. Wiley & sons
Published: 1886-03-25T05:00:00+00:00

CONDENSING ENGINES.

79

condensing diagram, the amount of compression is quite remarkable. This is brought about by the large

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amount of inside lap. The inside lap—§" with f " outside lap—probably accounts in part for a little more

back-pressure than might be expected, but from the fact that the exhaust-pipe is badly arranged, it is not certain how much of this back-pressure is due to the lack of exhaust-lead, and how much to the arrangement of the pipe. (The line nearest the vacuum-line V represents the pressure in the condenser, and is the one from which the back-pressure should be measured.) The faulty arrangement of the exhaust-pipe referred to is in running it down direct from the cylinder (the pipe is 6" diameter) for a short distance and then le-turning at an acute angle direct from the pipe leading down, without any enlargement or easing off of the bend whatever. Assuming that this bend in the exhaust-pipe is the principal cause of back-pressure, it is still probable that an earlier opening of the exhaust-valve would reduce it slightly, since it would afford more time for the steam to pass the stricture in the pipe. Reducing the inside lap would correspondingly reduce the compression, but would probably leave sufficient to satisfactorily cushion the piston. The exhaust-lap might probably be reduced to \ n or §", and then a little more steam-lead given to help up the compression, with satisfactory results, the slightly-rounded corner at b indicating that a little more steam-lead would do no harm otherwise. If this should result in a pound less average back-pressure, it would make a decidedly good diagram still a little better. It is needless to say that the first thing that ought to be done is to rearrange the exhaust-pipe so as to get rid of the sharp bend.

Points in the theoretical curve of the condensing diagram are indicated, beginning on the actual curve

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