Abstract
Compared to studies of the processes of icing of a structure without a gas-dynamic flow, there are significantly fewer studies with an airfoil flow. Of these, most of them are without vibrations, while studies under the influence of vibrations, devoted to the description of the mechanisms of ice formation during vibrations for various amplitudes and frequencies, could not be found. This article presents the results of numerical modeling of airfoil icing, taking into account its vibration according to the harmonic law, describes the mechanisms of icing at various vibration velocities, and shows the effect of vibrations on the mass of ice buildup. The dependences of the coefficient of the ratio of the velocity of the oncoming gas-dynamic flow to the vibration velocity KV on the mass of ice are revealed. It is shown that at low frequencies the effect of “sticking” of ice to the walls of the airfoil prevails, and with increasing frequencies – the effect of “shaking off”. Vibrations can not only reduce the mass of ice, but also increase it. A study of the effect of airfoil vibrations on icing will make it possible to take into account and, if necessary, change the range of natural and forced frequencies of structural elements. At constant vibration velocities close to the oncoming flow velocity, with an increase in the oscillation frequency from 2 to 60 kHz and a corresponding decrease in amplitude, the ice mass first increases by 50–80 %, and then decreases by 15–25 % relative to the “no vibration” mode.
Published Version
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