... differentiating in the size (diameter) are measured. Testing of both runners with the same guide vane system provided information about the effects of the increased vaneless space on the pump turbine performance and stability. A CFD methodology is developed by applying several turbulence models to accurately...

... coefficients in the basic units of turboexpander are shown in Fig. 5 . From the figure, we have seen that the maximum loss occurs in turbine compared with other units, and the losses in turbine increase with pressure ratio, whereas the losses in nozzle, vaneless space, and diffuser are almost constant...