| 摘要 |
The known rotor blade of axial-flow machines is improved. The improvement resides in a novel configuration of the respective blades in the rotor. The leading edge of the tip end portion of each blade tilts forwards to the upstream side, and also advances in the direction of rotation. In the tip end portion, between the tip end surface and a cross-section displaced from the tip end surface towards the central portion by 1/2 of a chord length, the configuration of the leading edge of the tip end portion is such that the angle S of skew direction of the leading edge of the tip end portion in the direction of rotation and the effective skew amount theta s eff in the direction of the leading edge of the tip end portion tilting forwards to the upstream side fall in a particular region in a diagram of S vs. theta s eff delimited by specific 4 points A, B, C and D determined through experiments. |
