LOSS REDUCTION DEVICE FOR USE IN PARTIAL ADMISSION TURBINE AND PARTIAL ADMISSION TURBINE

摘要

This loss reduction device for use in a partial admission turbine of at least one embodiment is for use in a partial admission turbine that includes a governing-stage nozzle that is configured to have an admission section and a non-admission section for a working fluid in the circumferential direction, The loss reduction device is provided with an annular disk section, disposed on the opposite side of the governing-stage nozzle so that a gap exists with respect to a rotor disk to an outer circumferential surface of which is attached a governing-stage rotor blade on which the working fluid admitted from the governing-stage nozzle acts. The annular disk section: has an opening section formed at a position corresponding to the admission section of the governing-stage nozzle; and is configured so that the inner circumferential edge thereof is located further radially inward than the outer circumferential surface of the rotor disk.