Experimental Investigation of Low-Pressure Turbine Blade Suction Surface Stresses Using S3F (Preprint)

摘要

A shear and stress sensitive film (S3F) is employed on the suction surface of an industry standard low-pressure turbine blade. These tests address the optimization of S3F for low-speed air investigations on a curved surface, and are the first measurements of its kind. S3F provides all three stress components on a surface in a single measurement, and is based on 3D elastic deformations of a polymeric film. New composition films have been developed, and results over a range of Re respective of LPT flow conditions illustrate the need for separate films tailored for the local stress levels in each area.