The Una-Flow Steam-Engine Johannes Stumpf

ISBN: 9781230454450

Published: September 12th 2013

Paperback

52 pages


Description

The Una-Flow Steam-Engine  by  Johannes Stumpf

The Una-Flow Steam-Engine by Johannes Stumpf
September 12th 2013 | Paperback | PDF, EPUB, FB2, DjVu, audiobook, mp3, ZIP | 52 pages | ISBN: 9781230454450 | 3.36 Mb

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...of the exhaust isMoreThis historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher.

Not indexed. Not illustrated. 1912 edition. Excerpt: ...of the exhaust is entirely absent in the case of the una-flow engine, as the exhaust is controlled by the piston which always uncovers the same large area of exhaust port. This feature Stump/, The una-flow steam engine. 7 obviates the losses, produced in ordinary loco engines at light loads by the high counter pressures. It was demonstrated in the case of two una-flow express locomotives built by the Maschinenbau Anstalt Breslau to the order of the Prussian railways (see figure 124), that such engines run smoothly.

This smooth running is due to the method of steam distribution. In order to show this clearer, the diagrams from a una-flow locomotive engine are shown alongside the diagrams from a counter flow engine in figure 116. In the case of the counter flow engine it is shown working with throttling and with full pressure. In the full pressure diagram, cut-off takes place after 17% of the stroke, whilst in the case of the throttle diagram the cut-off takes place after 31%%.

The cut-off for the una-flow engine is at 20% of the stroke. The inertia diagrams have been drawn for a speed of 110 km. and the rate of change of the pressure on the crank pin has been derived from the combination of the steam and inertia diagrams (Fig. 116, lower diagrams). The three upper diagrams, figure 117, show the rate of change of acceleration resulting from the effective pressure as a function of the time. It will be noticed that the curve of acceleration for the unaflow engine is very nearly level, whilst in the case of the counter flow engine there is a sharp change from positive to negative.

This is due to the fact that in the counter flow engine, the change in the direction of the effort coincides with the dead centre, whilst in the case of the una-flow...



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