Turbine blade

Abstract

Abstract PURPOSE: To reduce the backwash loss of blade, by determining the intersecting point of extension lines of the blade inlet angle and the blade outlet angle such that the distance from said intersecting point to the trailing edge of the blade is not less than 1/2 of the blade width, and selecting the ratio of the smallest width of fluid passage at the intersecting point to that at the trailing edge of blade in the range of 1W1.1. CONSTITUTION: Intersecting point P of extension lines of inlet angle α 1 and outlet angle α 2 of blade 10 is selected to satisfy the relationship l ax /L ax >0.5 (l ax is the distance from point P to the trailing edge of blade 10 and L ax is the blade width). At the same time, ratio of the smallest width S 1n of the fluid passage at the point P to that S 2n at the trailing edge of blade 10 is selected to satisfy the relationship, 1.1>S 1n /S 2n >1. With such an arrangement, fluid flow is accelerated, that is, fluid pressure is lowered on the upstream side of flow deflecting point J, whereas pressure drop on the downstream side of point J is reduced. Therefore, difference in the velocity of fluid flow on the opposite sides of blade can be minimized so that backwash loss of the blade can be reduced. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Takeshi Sato
• 👤 Akira Uenishi
• 👤 Norio Yasugadaira
• 👤 Katsukuni Kuno

Bibliographic Details