| 摘要 |
PROBLEM TO BE SOLVED: To reduce a loss by a leakage flow passing through a blade end clearance by gently inclining a blade tip part to the circumferential directional negative pressure side, and setting an inclined part to a specific moving blade height position and an inclination. SOLUTION: A blade tip part 11 (a tip part) of an axial flow compressor moving blade 10 gently inclines to the circumferential directional negative pressure side. According to an analytical result, a loss factor running along a moving blade height L becomes maximum in a position of 95% of the moving blade height L, and becomes a large value in a range not less than 85% around it. Therefore, an inclined part 12 is set not less than at least 10% of the moving blade height L, preferably, about 30%, and is gently inclined. Even it is set not less than 30%, an effect is little, and bending stress by centrifugal force becomes large, and fatigue strength of a moving blade 10 reduces. An inclinationαof the inclined part 12 is preferable to be about 20 deg. to about 30 deg.. According to an analytical result, when it is not more than 20 deg., a reducing effect of a loss factor is almost eliminated, and in the case of 30 deg., the loss factor can be sharply reduced. When it exceeds 30 deg., the bending stress becomes large.
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