Commuting airplane fuel oil ventilation device

Abstract

The invention belongs to the technical field of airplane fuel oil system design, and particularly relates to a commuting airplane fuel oil ventilation device. The commuter category airplane fuel oil ventilation device is characterized in that in the device, an embedded ventilation opening (1) is positioned in the lower wing surface of an oil tank ventilation separation cabin; the embedded ventilation opening (1) is a bulge provided with a wedge-shaped slope; the top end of the wedge-shaped slope is in the front position of the heading direction; the height of the top end of the wedge-shaped slope surface is aligned with the wing surface; the wide end of the wedge-shaped slope surface is in the back position of the heading direction; through the height of the wide end of the wedge-shaped slope surface, an included angle being 7 to 9 degrees is formed between the slope surface of the wedge-shaped slope surface and the wing surface; the upper surface of the wide end of the wedge-shaped slope surface is provided with a ventilation pipe (8); a flame inhibitor (7) is sealed and fixed on the ventilation pipe (8) of the embedded ventilation opening (1); the cross section of the ventilation pipe (8) is a rectangle with the length-to-width ratio being 4:1 to 3:1; and the length of the cross section of the ventilation pipe (8) is 0.5 to 0.6 of the width of the wide end of the wedge-shaped slope surface.

Description

technical field [0001] The invention belongs to the technical field of aircraft fuel system design, in particular to a fuel ventilation device for commuter aircraft. Background technique [0002] The air vent of the fuel system is used to ensure the normal ventilation of the fuel tank and is an essential device for the aircraft fuel system. In addition to meeting the ventilation performance requirements, the air vent design of the fuel system should also consider the anti-icing and lightning protection requirements of the airworthiness clause. [0003] Therefore, the air vent of the fuel system is divided into a buried type port and a protruding type port, and the buried type port is commonly used at present. The buried vent of the fuel system is different from the buried vent of other aircraft systems in terms of location and parameter selection, although the research on the technology and experiment of the buried air intake of the fuel system appeared in NASA very early. ...

AI Technical Summary

Problems solved by technology

[0004] Compared with the buried air intake of other aircraft systems that only consider the air intake, the main difference between the buried air vent of the fuel system is that the opening position and form of the buried device of the fuel ventilation system are different, and the required The main parameter is the stamping pressure rather than the dynamic pressure head, which cannot be theoretically calculated according to the conventional buried port, and the embedded device of the fuel system needs to carry out CFD simulation analysis or related tests

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