Performance of Hydraulic Turbines: Unit speed, Unit discharge, Unit power and Use of Unit Quantities

Performance of Hydraulic Turbines

In order to predict the behavior of a turbine working under varying conditions of head, speed, output and gate opening , the results are expressed in terms of quantities which may be obtained when the head on the turbine is reduced to unity. The conditions of the turbine under unit head are such that the efficiency of the turbine remains unaffected. The three important unit quantities are:

1. Unit speed

2. Unit discharge

3. Unit power

Unit speed


Unit dischargeUnit discharge

Unit power                        

Use of Unit Quantities
Use of Unit Quantities


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