The Centrifugal Pump Turbines And Water Motors Including the Theory And Pract
The Centrifugal Pump Turbines And Water Motors Including the Theory And Pract
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148 THE DESIGN OF With a loss of 4 per cent in the guide passages, this must be multiplied by 0'96, and we obtain n = 0-85.
Deducting 2 per cent for shaft friction, and 1 per cent for air friction, we finally obtain a net efficiency of 82 per cent, which corresponds with that of the best axial flow impulse turbines. If x is taken as 0'85, its more usual value, the hydraulic efficiency would be 0'87 x 0-96 = 0*83, and the net efficiency 0'83 - 0-03 = 0'80.
\ '- ~-v'J^ FIG. 125.
Characteristic Cu...rves. If we take as abscissa, and the reduced orifice as ordinate, we shall evidently get a straight line parallel to the axis of, because # is evidently constant for [a given sluice opening. The curve of M IMPULSE TURBINES.
149 where M is the torque on the shaft in foot-pounds, D the density of the liquid, r the mean radius of the wheel, and H the head, is a straight line such as A B, fig. 125, cutting the axis pf | at a point A where is unity, or very nearly so, if a is small, and somewhat more if this angle is greater than 25 deg.
What to read after The Centrifugal Pump Turbines And Water Motors Including the Theory And Pract?
You can find similar books in the "Read Also" column, or choose other free books by Charles Herbert Innes to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
148 THE DESIGN OF With a loss of 4 per cent in the guide passages, this must be multiplied by 0'96, and we obtain n = 0-85.
Deducting 2 per cent for shaft friction, and 1 per cent for air friction, we finally obtain a net efficiency of 82 per cent, which corresponds with that of the best axial flow impulse turbines. If x is taken as 0'85, its more usual value, the hydraulic efficiency would be 0'87 x 0-96 = 0*83, and the net efficiency 0'83 - 0-03 = 0'80.
\ '- ~-v'J^ FIG. 125.
Characteristic Cu...rves. If we take as abscissa, and the reduced orifice as ordinate, we shall evidently get a straight line parallel to the axis of, because # is evidently constant for [a given sluice opening. The curve of M IMPULSE TURBINES.
149 where M is the torque on the shaft in foot-pounds, D the density of the liquid, r the mean radius of the wheel, and H the head, is a straight line such as A B, fig. 125, cutting the axis pf | at a point A where is unity, or very nearly so, if a is small, and somewhat more if this angle is greater than 25 deg.
What to read after The Centrifugal Pump Turbines And Water Motors Including the Theory And Pract?
You can find similar books in the "Read Also" column, or choose other free books by Charles Herbert Innes to read onlineMoreLess
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