. American engineer and railroad journal . k Steam Jet. In the same manner as we described in VIII. the different sec-tions of a stream of steam issuing from a nozzle with a bridge weremeasured. The nozzle had a diameter of inches, the bridge wide and .31 inches deep. We found, in the first place, tl)».t the oSflg Major Axis. Minor Axis. Distancemeasnrsttion fronozzle op Distance a. Diam eter o steam jet. Flare of the side of the cone. Distance a. Dipm- eter of steaai iet. Flare ofthe sideof the; cone. inches. 0 to = (•). .39=(39). —.79 to .98 =-(.98). inches
. American engineer and railroad journal . k Steam Jet. In the same manner as we described in VIII. the different sec-tions of a stream of steam issuing from a nozzle with a bridge weremeasured. The nozzle had a diameter of inches, the bridge wide and .31 inches deep. We found, in the first place, tl)».t the oSflg Major Axis. Minor Axis. Distancemeasnrsttion fronozzle op Distance a. Diam eter o steam jet. Flare of the side of the cone. Distance a. Dipm- eter of steaai iet. Flare ofthe sideof the; cone. inches. 0 to = (•). .39=(39). —.79 to .98 =-(.98). inches. 0 1 53 to (). to () to = (). 1 in • 1 in With this form of bridge we may consider that the average flareof the current of steam in the direction of the longer axis is from1 in to 1 in and that in the direction of the shorter itranges at about I in as shown by Fig. 67. Fis. Vis fS- In consequence of this elliptical section the external surface ofsuch a jet of steam has a greater area and fills the section of thestack much earlier, that is to say at a lesser distance from the nozzle opening, than would be the case with a steam jet of the samesize but of circular section. Hence by an application of the bridgeto a nozzle having the same free opening we have: 1. A bet ter indraft of air or products of combustion on account ofthe greater surface area of the jet. 2. And also a more eUective height of stack, because of the factthat the section is filled earlier on account of the elliptical form ofthe jet. It may also be mentioned that with a nozzle distance of the jet of steam struck against the upper edge of the ring ona line with the major axis, so that the measurement a becamenegative and should be reckoned at from .79 to .93. Another result of the earlier filling of the section of the stack isshown in t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
