. American engineer and railroad journal . .00123 X = ., for stacks 36% ins., the coefficient of D is 29; forstacks 45% ins. the coefficient is .30; and for stacks 56% coefficient is .31, respectively. The general expression foreach of these coefficients is: (.246 -f .00123 H) = .246 + .00123 X = .2908(.246 -f .00123 H) = .246 + .00123 X = .3031(.246 + .00123 H) = .246 + .00123 X = .3154We may, therefore, write for any straight stack when theexhaust nozzle is on the center line of the boiler, d = (.246 -f .00123 H) Dd being the diameter of the stack in
. American engineer and railroad journal . .00123 X = ., for stacks 36% ins., the coefficient of D is 29; forstacks 45% ins. the coefficient is .30; and for stacks 56% coefficient is .31, respectively. The general expression foreach of these coefficients is: (.246 -f .00123 H) = .246 + .00123 X = .2908(.246 -f .00123 H) = .246 + .00123 X = .3031(.246 + .00123 H) = .246 + .00123 X = .3154We may, therefore, write for any straight stack when theexhaust nozzle is on the center line of the boiler, d = (.246 -f .00123 H) Dd being the diameter of the stack in inches when the exhaustnozzle is on the center line of boiler, H the height of thestack in inches, and D the diameter of the front end of theboiler in inches. A liberal interpretation of this equation isto the effect that the diameter of a straight stack should beapproximately one-fourth the diameter of the front-end plus,0012 inch for each ii)c)j in height. Modification in the form May, 1903. AMERICAN ENGINEER AND RAILROAD JOURNAL. 168. Uiaiiictt?! uf SUu.*k. Indies Fig. lUO OF DIAMETEB TO HEIGHT OF STACK FOB THE PUBDUE EXPEBIMENTAL LOCOMOTIVE FOB BEST BESULTS WHEN EXHAUST NOZZLE IS ON CENTEB LINE OF BOILEK. ins., gives maximum results for all heights of stack betweenthe limits of 20/u Ins. and 56% Ins. In other words, unlike thestraight stacit, the diameter of the tapered stack does notneed to bo varied with changes in the height. Stating this fact In the form of an equation, therefore, wehave for a tapered stack upon the Purdue engine, the diameterof the boiler of which is i»4 Ins., the following: Ja=;also da = = .25 X 54 1ns. Assuming that the results thus obtained from the experi-mental engine may be applied to other engines having differ-ent diameters of boilers, and using the diameter of the hollera? a unit of measure, we may write for all locomotives, and forall heights of stacks where the exhaust tip is on the center ofthe boiler: d = .25 D in whi
Size: 1435px × 1741px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
