Engine air intake de-icing systems, internal combustion engines and aircraft

Abstract

The invention provides an engine air inlet ice removing system. The engine air inlet ice removing system comprises a filtering cover allowing air to enter an air inlet of an engine; the inherent frequency of the filtering cover is greater than or equal to the vibration frequency of the engine during idling of the engine, and is less than or equal to 150% of the vibration frequency of the engine atthe 100% rotating speed of the engine. The engine air inlet ice removing system is provided the filtering cover allowing the air to enter the air inlet of the engine; the inherent frequency of the filtering cover is greater than or equal to the vibration frequency of the engine during idling of the engine, and is less than or equal to 150% of the vibration frequency of the engine at the 100% rotating speed of the engine. When the filtering cover is icy, the filtering cover resonates with the engine, the amplitude of the filtering cover increases during resonating, so that an ice layer on thefiltering is vibrated to fall off to achieve the purpose of ice removing, and gross efficiency of the engine is not decreased.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine deicing, in particular to an engine air inlet deicing system, an internal combustion engine and an aircraft. Background technique [0002] For helicopters, operating in cold and humid environments such as on mountains or near bodies of water, ice can form on the protective grille of the engine air intake, and the amount of ice that can accumulate can overwhelm the gas turbine intake. Partial blockage of the port may result in complete or partial damage to the gas turbine. [0003] The principle of the traditional de-icing system is to introduce part of the compressed air from the air outlet of the compressor to the engine intake to heat and de-ice the engine intake area. The main disadvantage of this type of deicing system is that it takes a lot of energy from the thermodynamic cycle of the gas turbine engine, reducing the overall efficiency of the engine. [0004] In addition...

AI Technical Summary

Problems solved by technology

The main disadvantage of this type of deicing system is that it takes a lot of energy from the thermodynamic cycle of the gas turbine engine, reducing the overall efficiency of the engine

[0004] In addition, since compressed air is introduced into the engine intake, it will expand rapidly, absorb heat or reduce its own temperature, resulting in inefficient heating of the engine intake area

At the same time, when the icing of the engine inlet is serious, the air intake is reduced, and the compressor outlet at this time cannot provide enough hot air for deicing, and the helicopter can only choose to land on the ground and then perform deicing operations.

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