A Fiber LDV System for Measurement of Atomized Droplets away from the Trailing Edge of a Fixed Blade in Two-Phase Flow

概要

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The presence of particles or water droplets in the flow of turbomachinery, especially in the low-pressure stages of steam turbines, leads to erosion of the moving blades and causes additional loss. This report describes a measurement technique for droplet sizing and velocity in atomized droplet flow by using a two-color, four-beam fiber laser doppler velocimeter (LDV) system. The optical probe system forms two coaxial measurement volumes with different diameters in which droplet sizes are evaluated by light scattering intensity. Measurements are performed for atomized droplet flow in the wake of a fixed blade. Test results demonstrate that relatively large droplets concentrate in the wake and are slowly accelerated by the stream. While the droplet velocities are influenced by the wake profile, the droplet sizes tend to be particularly affected by wetness rather than by stream velocity.
一般社団法人日本機械学会の論文
1990-08-15