Anti-corrosion structure of aircraft fuel tank

Abstract

The invention relates to the technical field of aerospace equipment, and discloses an anti-corrosion structure of an aircraft fuel tank. An anti-corrosion structure of an aircraft fuel tank includes a fuel tank. The lowest part of the fuel tank is provided with an oil discharge valve. A siphon is fixedly installed at the lowest place. The anti-corrosion structure of the aircraft fuel tank, through the action of capillary and siphon, absorbs the residual oil generated by the enclosure of structural parts such as stringers and frames, and the water accumulated in the residual water area is less, and with the anti-corrosion reinforced gathering concave surface, the residual oil All the water is gathered in the gathering concave surface, which reduces the influence of bacterial growth and improves maintenance efficiency, and under the action of siphon, most of the residual oil is collected to the lowest point of the fuel tank, reducing the unusable fuel in the fuel tank and improving fuel efficiency. Utilization efficiency, reverse oil injection through the siphon, because the capillary directly leads to the lowest point of the enclosure, reducing the time of fuel injection and release, thereby reducing the time required for calibration experiments.

Description

technical field [0001] The invention relates to the technical field of aerospace equipment, in particular to an anti-corrosion structure of an aircraft fuel tank. Background technique [0002] The wing-integrated fuel tank design is an aircraft fuel tank design method with a wide range of applications, but because the fuel is a mixture of various hydrogen-oxygen compounds, and with changes in temperature and pressure, free water and precipitation will occur in the fuel Water provides sufficient water and nutrients for the growth of microorganisms in the oil and water boundary. The growth of microorganisms and corrosion of fuel tanks have become one of the most serious and common problems in aircraft integral fuel tanks. [0003] see figure 1 Starting from the structural design, the water in the fuel tank can be collected from the drainage channel to the lowest point of the fuel tank and discharged from the oil outlet to the outside of the machine, so as to reduce the existe...

AI Technical Summary

Problems solved by technology

[0002] The wing-integrated fuel tank design is an aircraft fuel tank design method with a wide range of applications, but because the fuel is a mixture of various hydrogen-oxygen compounds, and with changes in temperature and pressure, free water and precipitation will occur in the fuel Water, in the oil and water boundary, provides sufficient water and nutrients for the growth of microorganisms. The growth of microorganisms and corrosion of fuel tanks has become one of the most serious and common problems in aircraft integral fuel tanks

[0003] see figure 1 Starting from the structural design, the water in the fuel tank can be collected from the drainage channel to the lowest point of the fuel tank and discharged from the oil outlet to the outside of the machine, so as to reduce the existence of water in the fuel tank as much as possible, which is the main way to prevent and control the growth of microorganisms in the fuel tank However, due to the influence of structural parts such as long trusses and frames, it is difficult to completely and effectively discharge the accumulated water, and there will still be a large area of ​​microbial breeding areas. Due to the special environment in the fuel tank, it is difficult to use machinery, and usually requires manual drilling. The fuel tank is cleaned manually, so the maintenance efficiency of the aircraft and the health of the human body are difficult to guarantee

[0004] Furthermore, due to the relationship between the structure of the fuel tank, the long stringer and the frame, the fuel in some areas of the fuel tank cannot be discharged naturally. On the one hand, in order to control and prevent the growth of microorganisms, the residual fuel in the fuel tank is discarded during aircraft maintenance. Disposal caused a waste of resources, and at the same time, this part of the fuel that did not play a role also increased the dead load of the aircraft. On the other hand, for the first ground test of the newly developed aircraft, the calibration of the amount of fuel that cannot be released from the fuel tank needs to be completed first. However, the environmental requirements of the fuel system test are relatively harsh, so the test time needs to be as short as possible to reduce the impact of the environment on the test results. The conventional calibration method is to add a sufficient amount of fuel through the gravity fuel filler to cover the fuel tank as much as possible. At the bottom, when the fuel is discharged, the reduced amount of fuel is the amount of fuel that cannot be discharged. Since the fuel needs to be submerged in structures such as stringers and frames, this process requires more fuel and is limited by fuel injection and discharge efficiency. It takes a lot of time. Highly affected by the environment

Images