![]() Marrochello, Calculations of Rivulet Formation in the Surface-Water Flow over Wings in Rain, American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 2, 1997. Decker, A Lagrangian-Eulerian Scheme for Flow around an Airfoil in Rain, International Journal of Multiphase Flow, Vol. Craig, Low Reynolds Number Tests of NACA 64-210, NACA 0012, and Wortmann FX67-K170 Airfoils in Rain, Journal of Aircraft, Vol. Manuel, Measurements of Water Film Characteristics on Airfoil Surfaces from Wind-Tunnel Tests with Simulated Heavy Rain, AIAA Paper, 1985. Barsotti, Surface Wetting Effects on a Laminar Flow Airfoil in Simulated Heavy Rain, Journal of Aircraft, Vol. Luers, Aerodynamic Penalties of Heavy Rain on Landing Airplanes, Journal of Aircraft, Vol. Rhode, Some Effects of Rainfall on Flight of Airplanes and on Instrument Indications (NACA TN 803, 1941). The water film height and the location of rivulet formation on the upper surface of the airfoil are also presented.Ĭopyright © 2013 Praise Worthy Prize - All rights reserved. The computational results showed that larger droplets were more susceptible to droplet breakup than smaller droplets and generally breakup near regions with severe pressure gradients, close to the airfoil. It was concluded that degradation of aerodynamic performance increases with increasing LWC up to stall angle and stall is delayed for all rain rates. The simulation of rain was accomplished by using the two-phase flow Discrete Phase Model. ![]() A computational fluid dynamics code was utilized to gain further knowledge on the flow field. ![]() Four different rainfall rates were simulated by injecting water droplets from commercial rain simulation nozzles upstream of the airfoil model, corresponding to LWCs of 20.548 g/m3, 37.745 g/m3, 41.096 g/m3 and 75.491 g/m3. Wind tunnel tests were conducted to determine lift and drag coefficients at various angles of attack in both dry and wet conditions and the results were compared to show the effects of Liquid Water Contents (LWC) at airfoil performance. The influence of different rain rates on the aerodynamic performance of the NACA 0012 airfoil with a low Reynolds number of 1×105 was investigated. ![]()
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