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International Conference on Control Engineering and Mechanical Design (CEMD 2017)

Chao Li
Chao Li
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This Metrological conditions like icing and rain have been the cause of many aviation accidents due to aerodynamic performance degradation. In this paper icing and heavy rain effects on the aerodynamic performance on GLC305 have been studied. For icing effects study, GLC305 airfoil clean and with 16.7min ice shape (rime 212) and 22.5 min ice shape (glaze 944) is used. For rain modeling, Discrete phase modeling (DPM) has been used to incorporate the rain effects in continuous phase using two phase flow approach. In DPM two phases coupling and its impact on both the phases has been included. In DPM, the wall film is modeled by the injected rain particles in continuous fluid phase of air. GLC305 airfoil showed a significant decrease in lift and increase in drag in simulated Icing and rain environment. In our study it is found that the Icing and heavy rain causes premature boundary-layer transition at low angle of attack (AOA) and separation at high AOA. The water film layer on the surface of the airfoil formed due to rain and the icing on the leading edge of airfoil due to super cooled water droplets are thought to alter the airfoil geometry and increase the mass effectively. It is strongly believed that simulating the icing and rainy conditions combined may help us understand the effects of complex and severe weather conditions on the aircraft performance and maneuverability.

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