Hydraulic engineering; a practical treatise on the principles of water pressure and flow and their application to the development of water power, including the calculation, design and construction of water wheels, turbines, and other details of hydraulic power plants (1909)
American School (Chicago, Ill.), Black, Adolph, Turneaure, Frederick Eugene, 1866- · Chicago American School of Correspondence · leaf 146
= 2a Using this value of cf) in Equation 48, there results: 2 cos a (79) Equations 78 and 79 state the conditions involved in Equations48 and 77, for maximum hydraulic efficiency, in terms sometimesmore convenient for use. When a wheel constructed according to this WATER-POWER DEVEL0P:\IEXT 61… … Fig. 40. Faulty Design of Vane. 77. An analysis of this formula teaches that, for high efficiency,both the approach angle a and the exit angle ^ should be small; but they cannot be zero,otherwise waterwould not pa.ss intoand out of thewheel. Values of15 to 30 degrees arecommon. Since, forsmall…
