2.4.7 Partial admission. Turbine Efficiency The Efficiency of turbine and generator given Power obtained from water flow in horsepower is defined as ratio of actual to theoretical efficiency is calculated using Efficiency = (Power *550)/(Discharge * Effective head).To calculate Efficiency of turbine and generator given Power obtained from water flow in horsepower, you need Power (P), Discharge (Q) & Effective head (H). Thermal Efficiency Formula Turbine Efficiency Where the Supply is low it is usual to have an open flume supply with a short Pinstock e.g. Inputs: air density (ρ) rotor swept area (A) coefficient of performance (Cp) unitless. Now the blade efficiency of the impulse turbine is given by, Blade efficiency, ηb η b = Workdone Energy supplied Workdone Energy supplied. ω = 2πN/60 = angular speed in rads per second. The gas power is calculated by assuming that the expansion through the power turbine is isentropic (i.e. that the power turbine efficiency is 100%). The thermal efficiency of the gas generator is referred to as the gas thermal efficiency and is calculated from the gas power, thus enabling comparison of the performance of different gas generators.
