Abstract
The subject of the experimental investigations presented in this paper is the behaviour of a two phase air and water droplets flow in a transonic compressor rotor blade passage carried out to understand the detailed processes in wet compression operation. Non-intrusive measurements were taken to investigate the droplet airflow interactions as well as the droplet blade surface collision. The qualitative results presented in this paper concentrate on the phenomena close to the blade and on the blade surface. Water formations and collision mechanisms on the surface are shown as well as the deformation of the droplets due to the acceleration of the flow in the blade passage. The quantitative results provide the velocity distributions of dry airflow and the flow fields of different droplet classes in two phase flow at the same operation point. Results show that the liquid phase has little impact on the airflow. The droplet impingement on the leading edge causes a splitting into a large amount of small droplets due to splashing. Droplets of larger diameter originate from the trailing edge of the blade as a consequence of the water mass accumulating on the blade surface.
Published Version
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