. American engineer and railroad journal . s are small. In fact, the tangentialstrain is insignificant upon a circumference of 2| in. radius ;at 400 revolutions per second it does not exceed lbs. persquare inch when the machine is producing 10 ; hence,these turbines are very small as compared with the powerthat they develop (about in. for 200 ), and the shaftsare light. DESCRIPTION OF THE LAVAL TURBINE. The Laval turbine is similar to the hydraulic turbine in thepartial introduction and free escape. It is composed of awheel with wings or buckets (fig. 14), against which the
. American engineer and railroad journal . s are small. In fact, the tangentialstrain is insignificant upon a circumference of 2| in. radius ;at 400 revolutions per second it does not exceed lbs. persquare inch when the machine is producing 10 ; hence,these turbines are very small as compared with the powerthat they develop (about in. for 200 ), and the shaftsare light. DESCRIPTION OF THE LAVAL TURBINE. The Laval turbine is similar to the hydraulic turbine in thepartial introduction and free escape. It is composed of awheel with wings or buckets (fig. 14), against which the per-fectly expanded steam is led by one or more conical openings, whose a\is is slightly inclined to the plane of the jets oi Bteam enter the conduits and glide over thewings by virtue I the relative velocity and oommunicate to the tatter the vis eivaot the steam. This steam passes out atthe opposite side with an absolute velocity which it is soughtto render as low as possible by giving the best possible con-tour to the • Paper read before the^Society of Civil Engineers of France. Fig. WITH SEPARATE BUCKETS. The body of the turbine is mounted upon a steel shaft () which rests in two boxes at its ends, and the whole turnsin a chamber (fig. 17), which is provided with the openings ainto which the outlet for the distributers is fastened. Atone end of the shaft there is a regulator (fig. 18), the detailsof which are shown in fig. 19, that acts by means of a leverupon a balanced safety-valve, placed at the point where thesteam enters the turbine. A train of gears (3 on fig. 16 andfig. 20) completes the makeup of the motor, and reduces thespeed of the turbine in such a ratio as may be desired. The Steam Distributers.—This important part causes thesteam to be perfectly expanded before it reaches the wings. ■OKI
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
