Experimental Investigation In Icing Tunnel And Numeration Of Water Droplets Impact Characteristics About Cylinder

Icing is one of the reasons that may cause aircraft to serious accident. The study of aircraft icingcan help people understand the mechanism of icing, grasp the law of icing hazards flight safety andprovide the basis for design of anti or de-icing device and formulation of flight&operationspecification in icing condition. This paper got a deep study on icing phenomenon in flight throughtheoretical analysis, wind tunnel tests and numerical simulation.The paper first elaborated the similarity criteria of icing, and derived&analysed the equationson the similarity rules of geometrical, flow field, trajectory and impact characteristics of waterdroplets, and thermodynamic and dynamics properties of surface liquid water. Then, an ice windtunnel was built, and the wind speed corresponding to different supply pressure of the ejector and theamount of water spray corresponding to different LWC at various wind speed were calibrated;Meanwhile, the uniformity of LWC in air was assessed. The experiments on the development of iceshape with time were carried out in the tunnel first, which found that the ice increased with the timeadvance almost linearly. Next, the similarity criterion of cylindrical (D=25.4mm and50.8mmrespectively) was studied, which proved that similarity criterion of icing can expand the existingmodel size in icing wind tunnel test and range of weather conditions, and enhanced the ability of icingexperiment. Finally, the ice shapes at experiment conditions were simulated using the rime ice icingprediction method, which got the ice shapes at100s,200s and300s and were compared with theexperiment results, proving that the numerical simulation method in this paper was feasible andeffective.