A novel technique for blade-to-blade velocity measurements in a turbine cascade
1989; Linguagem: Inglês
10.2514/6.1989-2691
AutoresLarry Goss, M. E. Post, D. D. Trump, B. Sarka, Charles A. MacArthur,
Tópico(s)Particle Dynamics in Fluid Flows
ResumoA two-color particle-image velocimetry technique has been developed to study two-dimensional velocity flowfields. In the method, a green-colored laser sheet (formed by a doubled Nd-YAG laser) and a red-colored laser sheet (formed by a Nd:YAG-pumped dye laser) are used sequentially to expose the particle positions. Direction and particle displacement can be uniquely determined with the method because the green-particle image occurs before the red-particle image by a known time increment. The method is particularly useful for complex flowfields where the normal 180-deg directional ambiguity of single-color techniques can be troublesome. Velocity data for a turbine-cascade test section have been obtained with the two-color technique. 15 refs.
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