Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . Fig. 47b. Velocity Diagrams for Reaction Blading. made available by increasing the relative velocity from W2 atentrance to Vr3 at the discharge, when assuming no frictionallosses along the blades, thus E3 = Vr32 - V,222g Impulse Force due to Stream Flow Across Moving Blades. The total tangential force F on a moving row of bladesdepends on the amount of steam flowing (W) in pounds persecond, on the relative entrance and discharge velocities (W2and Vrz) and on the entrance
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . Fig. 47b. Velocity Diagrams for Reaction Blading. made available by increasing the relative velocity from W2 atentrance to Vr3 at the discharge, when assuming no frictionallosses along the blades, thus E3 = Vr32 - V,222g Impulse Force due to Stream Flow Across Moving Blades. The total tangential force F on a moving row of bladesdepends on the amount of steam flowing (W) in pounds persecond, on the relative entrance and discharge velocities (W2and Vrz) and on the entrance and exit angles (/? and 7). The impulse of the stream entering the moving blades is (Fig. 43), and similarly when leaving is„ W wv wv,g rZ . g then — \ Vr2 cos |8 + Vr3 cos 7 \.g cos |3 (21) * The steam pressure Pz and density at the exit of the moving row of blades areagain obtainable directly by means of an entropy-heat chart. See, for instance,steam charts by F. O. Ellenwood, published by John Wiley & Sons; and by JohnMorrow, published by Longmans. 90 THE STEAM TURBINE This formula is deduced from first pri
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