1 Copyright © 2013 by ASME NUMERICAL SIMULATION ON ICE ACCRETION PHENOMENA IN ROTOR-STATOR INTERACTION FIELD Ryosuke Hayashi Tokyo University of Science Chiyoda-ku, Tokyo, Japan Makoto Yamamoto Tokyo University of Science Chiyoda-ku, Tokyo, Japan ABSTRACT Ice accretion is a phenomenon where super-cooled water droplets impinge and accrete on a body. On a jet engine, ice accretion disturbs the inlet flow, and separated ice pieces can damage to the turbine component, which leads to the severe performance degradation. We simulated icing phenomena in a fan rotor-stator interaction field [1]. This study mainly focused on the icing property at the rotor blade, because the maximum ice thickness of the rotor blade is about seven times larger than that of the stator vane. Moreover, in the study, the effect of the tip clearance was neglected because of the computational simplicity. Therefore, in the present study, we simulate icing phenomena in a rotor-stator interaction field, considering the tip clearance, to clarify the effect of the tip clearance on the ice accretion of the stator vane. The numerical results indicate the tip leakage vortex affect the icing phenomenon at the stator vane. NOMENCLATURE A imp area of droplet impingement B i thickness of ice layer B w thickness of water film C D drag coefficient C pi specific heats of ice C pw specific heats of water d d droplet diameter h normal distance from wall k i thermal conductivity of ice k w thermal conductivity of water L F latent heat of solidification water LWC liquid water content m e,s mass flux of evaporation or sublimation m im mass flux of impingement droplet m in mass flux of runback MVD medial volume diameter N imp number of droplet impingement N in number of droplet inlet Re d Reynolds number of droplet t time T a temperature of air T f temperature of freezing T i temperature of ice T s temperature of surface T w temperature of water U d droplet velocity U f flow velocity U r relative velocity between gas and droplet We d Weber number of droplet  d density of droplet  f density of flow  g density of glaze ice  r density of rime ice  rotational speed  surface tension of water INTRODUCTION Ice accretion is a phenomenon where super-cooled water droplets impinge and accrete on a body. It has two types of ice shape. One is called ‘rime ice’ which is generated at very low temperature (less than -10 °C). On rime ice condition, droplets in the air freeze at the impingement point instantly. The other is called ‘glaze ice’ which is generated at -10 to 0 °C. On glaze ice condition, droplets gradually freeze with running along a body (so-called runback). When ice layer is formed on an aircraft wing, it affects on the performance by increasing drag and reducing lift, and it may cause a serious accident. On a jet engine, ice accretion disturbs the inlet flow, and separated ice pieces can damage to the compressor and the casing, which leads to the severe Proceedings of ASME Turbo Expo 2013: Turbine Technical Conference and Exposition GT2013 June 3-7, 2013, San Antonio, Texas, USA GT2013-95448