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V. Tasdelen, J. Hertel, R. Fiola, S. Staudacher
Liquid water in the airflow can adversely affect the engine performance and operability. During rainy conditions, the fan module is the first component which is affected by the ingested water. The water droplets collide with the spinner as well as the fan blades and splash, spread or rebound. Due to the droplet-wall-collisions, the initial droplets breakup into smaller secondary droplets that will tend to follow the airflow. The fan rotation and droplet-wall-collisions lead to a redistribution of the amount of water in the core and in the bypass stream. In order to account for the phenomena mentioned above, a numerical approach is proposed to estimate the amount of water and its properties as it enters the core. This paper presents a two phase modelling strategy via the Lagrangian frame of reference. The flow-field solver is coupled with a droplet tracking model and breakup model. In the first step, the two phase model is introduced. In the next step, the behaviour of different droplet sizes in a generic fan geometry is examined. In addition, the effect of different water-air-ratios, initial droplet diameters and fan rotational speeds on the distribution of water between the bypass and the core has been investigated. Moreover, validation strategies are proposed and the results are compared against available experimental data from the literature.
Deutscher Luft- und Raumfahrtkongress 2014, Augsburg
Verlag, Ort:
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2014
Conference Paper
21,0 x 29,7 cm, 9 Seiten
Stichworte zum Inhalt:
two phase model, water ingestion
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