The aerodynamic analysis on the three stages centrifugal turbine of organic working fluid

Abstract:

Based on one dimensional aerodynamic analysis theory, a three-stage centrifugal turbine was designed by using R123 as working fluid. The aerodynamic performance of the centrifugal turbine was studied by numerical simulations. Numerical results showed that the circumferential efficiency of the three-stage centrifugal turbine with equal blades and high straight blades can reach 86.7% under design conditions. Under the off-design conditions, the efficiency increases initially with increasing expansion ratio, reaches a maximum and then decreases. The thermal parameters such as expansion ratio, enthalpy drop and reaction degree of each stage of centrifugal turbine increase from high pressure stage to low pressure stage with the change of expansion ratio of each stage group, and the last stage changes the most.