TURBINE

WIPO Patent Application WO/2011/122092

A1

In the disclosed turbine, step sections (52), which have step surfaces (53), are provided on one among a tip section (51) of a blade (50) or an area (11a) of a structure (11) corresponding to the tip section (51), and protrude towards the side of the other one among the tip section (51) and the area (11a) of the structure (11). Seal fins (15) which extend towards the step sections (52) are provided on said other one among the tip section (51) and the area (11a) of the structure (11). Cavities (C) are formed between the tip section (51) of the blade (50) and the area (11a) of the structure (11) between the seal fins (15) and the partition walls (54, 15) which face the seal fins (15) on the upstream side in the direction of the axis of the rotation of the structure (11). Furthermore, the seal fins (15) are equipped with: fin main body sections (16) which form micro gaps (H) between the step sections (52) and the seal fins (15); and space restriction sections (17) which restrict the space of the micro gaps (H) on the upstream side in the direction of the axis of the rotation, and which form small cavities (18) between the cavities (C) and the micro gaps (H). Thus provided is a high performance turbine which the leakage flow rate is reduced.

KUWAMURA YOSHIHIRO (JP)
MATSUMOTO KAZUYUKI (JP)
OYAMA HIROHARU (JP)
TANAKA YOSHINORI (JP)
MATSUO ASAHARU (JP)

PCT/JP2011/051895

October 06, 2011

January 31, 2011

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MITSUBISHI HEAVY IND LTD (JP)
KUWAMURA YOSHIHIRO (JP)
MATSUMOTO KAZUYUKI (JP)
OYAMA HIROHARU (JP)
TANAKA YOSHINORI (JP)
MATSUO ASAHARU (JP)

F01D11/02; F01D25/00; F16J15/447

JP2006291967A	2006-10-26
US20090072487A1	2009-03-19
JP2002228014A	2002-08-14
JPS6361501U	1988-04-23
JP2006291967A	2006-10-26

See also references of EP 2554796A4

MORI Ryuichirou et al. (JP)
Woods Ryuichiro (JP)

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