| Citation: | CHEN Gong, YANG Kun, WANG Liping, et al. Test of ice shedding on turbofan engine blade in refrigeratory environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2106-2114. doi: 10.13700/j.bh.1001-5965.2018.0035(in Chinese)
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Due to the complexity and randomness of the turbofan blade icing shedding characteristics, it is difficult to use computational simulation to obtain reliable results. On the other hand, icing wind tunnel test can hardly be always applied due to its high cost. In this paper, a feasible, economical and reliable test method is proposed by using mixed-flow fan, water spray and temperature control system in the environment of refrigerator to simulate freezing weather condition during real flight. A scaled powered model of a certain civil aircraft turbo-fan-engine is used as research object to study the blade icing and ice shedding characteristics and rules in different working conditions. Before formal test, parameters such as flow velocity, liquid water content, and mean volumetric diameter are calibrated by anemometer, particle sizer, standard ice blade and metallic grille. A fog absorber is created to solve the problem of fog recycling and accumulation, which makes it possible to keep the stability of flow field in an enclosed refrigeratory environment. The test results show that when the rotational speed is fixed at 2 400 r/min, consuming time for shedding and residual ice characteristic length decrease initially and increase afterwards with the decrease of environment temperature. The inflection point appears when the temperature is in the range of -3.5℃— -5℃; when the temperature is fixed at -7℃, the consuming time for ice shedding and the characteristic length of residual ice decrease monotonously with the increase of the rotational speed of blade.
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