. The steam-engine and other heat-motors . the delivered weight 150. Kg. per sq- cm. 160 150 140 130 120 110 100 90 80 70 GO 50 40 30 20 10 Fig. constant. For perfect gases, if p2 becomes less than .528pi,the delivered weight decreases. If p2 is kept constant and p\is increased the weight delivered of steam or perfect gases isincreased. A nozzle must be designed to give definite results under defi-nite conditions. It can be shown that a very slight alteration SUPERHEATED STEAM AND STEAM-TURBINES. 445 of the conditions may produce a very considerable changein the results. Nozzles ma
. The steam-engine and other heat-motors . the delivered weight 150. Kg. per sq- cm. 160 150 140 130 120 110 100 90 80 70 GO 50 40 30 20 10 Fig. constant. For perfect gases, if p2 becomes less than .528pi,the delivered weight decreases. If p2 is kept constant and p\is increased the weight delivered of steam or perfect gases isincreased. A nozzle must be designed to give definite results under defi-nite conditions. It can be shown that a very slight alteration SUPERHEATED STEAM AND STEAM-TURBINES. 445 of the conditions may produce a very considerable changein the results. Nozzles may easily be too long or too short,may expand too rapidly or not rapidly enough, and the orificeat the entrance may be too well rounded or the reverse for exist-ing conditions. If the nozzles are too long the work of frictionis carried off as heat. Short nozzles are desirable with low pres-sures; with high pressures longer nozzles may be used. Ifthe cross-section of the nozzle increases too rapidly the streamacquires too many cross-eddies. The maximum weight of ste
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