DONG Huanyu1, WANG Zhi2

(1. Datang International Jiangshan Newtown Thermal Power Co.Ltd., Jiangshan 304100, China; 2. School of

Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China)

 

Abstract: Aiming at the problem of aerodynamic loss generated by organic flow in turbine, the inflow characteristics in SC11 static cascade using R245fa was numerically studied. Definition methods of properties for viscous organic fluid were proposed. Adopting state equation of idealgas and SW equation, the flow fields of static blades utilizing numerical simulation method were respectively analyzed. Different variations of compressibility factor and density along the cascade path using different equations were compared. The extent of nonideal state of organic flow in static turbine cascade was evaluated. The distribution of organic flow parameters were analyzed, and expansion rules of different regions in static cascade were obtained. The results indicate that there are big deviations of parameters using idealgas equation of state compared with SW equation, so idealgas equation is no longer applicable in numerical simulation of organic flow in turbine. In static turbine cascade,pressure drop amplitude on pressure side is more smooth than that in blade suction surface. Mach number appears the max value in the downstream of the suction surface. Loss exists in the wake of the blade.

Key words: organic working fluid; numerical simulation; gas equation of sate