Fig.F-27
Dependence of the speed coefficient upon rotor geometry and achieved efficiency of radial centripetal turbines. Similarly as for pumps (Fig.F-20) there is a flat optimum near 1 rad. Water turbines are usually large and for easier transportation, it is common to choose conditions leading to larger speed coefficient - similarly as in Fig.F-20 larger value of the coefficient leads to smaller rotor diameter and thus smaller overall dimensions. |
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Fig.F-28 |
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Vaclav TESAR : "BASIC FLUID MECHANICS"