The Design and Aerodynamic Analysis on 1MW Centrifugal Turbine of Organic Working Fluid
Inthisstudy,a single-stage transonic centrifugal turbine and a four-stage centrifugal turbine was designed for an ORC system with capacity of one megawatt.The structure dimensions of two turbines weresimilar.The aerodynamic performance of the designed turbines was investigated by CFD technology.Numerical simulation results suggested that the fluid moves smoothly and the pressure distribution was maintained within a reasonable range.Under the design condition,the isentropic efficiency of the single-stage transonic centrifugal turbine was 83.44%,and the stage group efficiency of the four-stage centrifugal turbine was 86.7%.Under the off-design conditions,the ratio of specific heats Cp/Cv of working medium with considering physical properties of organic fluids was introduced to correct the calculation formula of enthalpy and the mass flow rate.The overall performance of the four-stage centrifugal turbine was better than the single-stage transonic centrifugal turbine.
centrifugal turbineaerodynamic performancenumerical simulationenthalpythe mass flow
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