Stereoscopic PIV Measurements of the Flow Field in a Turbine Cascade

• Published in: Journal of thermal science Vol. 26; no. 1; pp. 89 - 95
• Main Authors: Tian, Yangtao, Ma, Hongwei, Ma, Rong
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.01.2017; Springer Nature B.V
• Subjects: cascade; Cascade flow; CCD cameras; Classical and Continuum Physics; Engineering Fluid Dynamics; Engineering Thermodynamics; Fluid dynamics; Fluid flow; Heat and Mass Transfer; horseshoe; Horseshoe vortices; Incidence angle; Leakage; Light sheets; Low speed; Particle image velocimetry; Physics; Physics and Astronomy; PIV; Reynolds number; Stereoscopic; Stereoscopy; tip; Tip clearance; turbine; Turbines; Turbulence intensity; Turbulent flow; vortex; Vortices; Stereoscopic PIV; tip leakage vortex; horseshoe vortex; turbine cascade
• DOI: 10.1007/s11630-017-0914-y
• ISSN: 1003-2169

This paper presents experimental measurements of the flow field in a Low-speed Turbine Cascade using a ste-reoscopic particle-image velocimetry （SPIV）. During the measurements, a pair of frame-straddling-based CCDcameras were configured at different sides of the laser light sheet, and appropriate tracing particles （DEHS） wereemployed. The measurements were conducted at the incidence angle of 0 degree and exit Reynolds number of 1.7× 10^5 with the tip clearance 1.18% of blade chord. The tip flow features, such as the evolution and breakdown oftip leakage vortex, the horseshoe vortex, turbulence characteristics of tip leakage flow, were studied for the flowfield analysis. The results showed that the tip leakage flow/vortex mainly dominate flow fields in the tip region.The tip leakage vortex performs as a concentrated vortex before its breaking down and splitting into small vortic-es. The highest turbulence intensity mainly occurs in the tip region along with the trajectory of tip leakage vortex,and when the vortex breaks down, the turbulence intensity reduces rapidly. Additionally, the SPIV with this con-figuration also shows an advantage in investigating the flow structures and mechanism inside the turbine cascade.