Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig. 150. Fig. 151. Fig. 150.—Section through DeLaval 151.—Sections of DeLaval turbine with curves of pressure and velocity. Fig. 150 shows a section of the DeLaval turbine. This is animpulse turbine in which velocity is generated in a single set ofnozzles A attached to a steam chest. The velocity is utilizedon one set of blades. To increase the power of the machine anumber of nozzles are used. The angle of the nozzle relative tothe plane of the blade is made as small as possibl
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig. 150. Fig. 151. Fig. 150.—Section through DeLaval 151.—Sections of DeLaval turbine with curves of pressure and velocity. Fig. 150 shows a section of the DeLaval turbine. This is animpulse turbine in which velocity is generated in a single set ofnozzles A attached to a steam chest. The velocity is utilizedon one set of blades. To increase the power of the machine anumber of nozzles are used. The angle of the nozzle relative tothe plane of the blade is made as small as possible, as shown inFig. 150, so that the efficiency which is proportional to cos2 ais as large as possible. The peripheral speed of the wheel is very 302 HEAT ENGINEERING great. wa is equal to 3820 ft. per second if the drop in the nozzleis from lbs. gauge to 6 lbs. absolute. The speed of the wheelfor a value of / of and cos a = would be Wh=zy2X X 3820 = 1719 ft. per sec. This would mean 16,400 for a radius to the blades of 1 pressure drop for the axial distances of no
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
