LOW-PRESSURE TURBINE BLADE HAVING WAVY SUCTION SURFACE

摘要

A low-pressure turbine blade having a wavy suction surface, applicable to reducing profile loss of a high-load low-pressure turbine blade and an ultra-high-load low-pressure turbine blade on an aero engine. The low-pressure turbine blade comprises a blade leading edge (1), a blade suction side (2), a blade pressure side (3), and a blade trailing edge (4). The shape of the blade suction side (2) is a wavy surface extending in a height direction of the blade. The wavy surface starts at the blade leading edge (1), and ends at the blade trailing edge (4). The wavy surface is formed by alternately arranging crests and troughs. From the blade leading edge (1) to the blade trailing edge (4), the distance between the wavy crest and the wavy trough in a vane pitch direction increases linearly from 0 to 2A and decreases linearly from 2A to 0, where A is the greatest amplitude of the wavy surface. Fluid separates from the blade in the position corresponding to the greatest amplitude. The blade structure effectively reduces separation of the fluid from the blade, reduces loss, and improves the performance of a low-pressure turbine.