Investigation of the Optimum Clocking Position in a Two‐Stage Axial Turbine

A frozen rotor approach in a steadycalculation and a sliding mesh approach in an unsteady simulationare performed in a stator clocking investigation. The clocking isexecuted on the second stator in a two-stage axial turbine overseveral circumferential positions. Flow field distributions aswell as the estimated performances from two approaches arecompared with each other. The optimum clocking positions arepredicted based on the estimated efficiency from the twoapproaches. The consistence of the optimum clocking positions isdiscussed in the paper. The availability and the limit of thefrozen rotor approach in predicting the optimum clocking positionis analyzed. It is concluded that the frozen rotor approach isavailable to search the optimum clocking position in thepreliminary design period, although it misses some features of theunsteady flow field in the multistage turbines