Ice Protection System

ICE PROTECTOIN SYSTEM

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Spinner -обтекатель

air intakes - воздухозаборники

anti-icers – противообледенительное устройство

to exceed - превышать

to reduce – снижать

power consumption – расход мощности

heat loss - теплопотеря

Ice Protection System

The aircraft ice protection system provides flight safety under king conditions when flying at any altitude and speed irrespective of duration of flight.

Protected from ice formation in the aircraft are:

- Wing and tail empennage;

- Propeller blades and spinners;

- Engine air intakes;

- Four forward glass panels of the cockpit wind-screen.

The principle of operation of all the anti-icers is based on the fact that with' the anti-icers put into operation the temperature of protected surfaces reaches a positive value thus preventing formation of ice on them and providing remove of the ice formed.

When the air intake anti-icers are operating the power to them is supplied continuously. The power to the windscreen anti-icers operative is supplied so that the temperature of the outside surface of the windscreen glass panels does not exceed + 35° C. In operation the wing, tail empennage and propeller heaters receive power periodically in a repeating cycle The cycle consist of a heating period when the protected surface is heated up to a positive temperature and the ice formation (if present) is removed, and a cooling period when the protected surface can be cooled up to a negative temperature and the ice begins forming again.

As compared with the continuous heating the electric cyclic method of ice protection reduces the power consumption by several times. It is explained by the fact that in the second case the current is supplied to the de-icer periodically, and a light layer of ice forming on the protected surface during cooling period does not affect the aerodynamic characteristics of the aircraft but sharply reduces the heat loss due to the ram air flow.

Дата добавления: 2015-07-20