A Closed-loop Aircraft Fuel Tank Airborne Inerting System

Abstract

The invention discloses a closed-loop aircraft fuel tank airborne inerting system. The system comprises an oil tank, the gas outlet of the oil tank is connected with the inlet of a condenser through apipeline, and the gas outlet of the condenser is sequentially connected with a first flame arrester, a gas dryer, a first flow sensor, a gas compressor and the gas inlet of an electric pressure regulating valve through pipelines. The gas outlet of the electric pressure regulating valve is sequentially connected with a first heat exchanger, a first pressure sensor and a first temperature sensor through pipelines, and the other end of the first temperature sensor is connected with the inlet of a first electric stop valve and the inlet of a second electric stop valve. An outlet pipeline of the first electric stop valve is connected with the inlet of a conventional hollow fiber membrane separator, and an outlet pipeline of the second electric stop valve is connected with the inlet of an emergency hollow fiber membrane separator. According to the present invention, the compensation loss increase caused by the engine bleed air can be avoided, the system weight and size are small, the inerting requirements under different working conditions are met, mode switching is achieved, and the system work is more intelligent.

Description

technical field [0001] The invention relates to the field of aviation technology, in particular to a closed-loop aircraft fuel tank airborne inerting system. Background technique [0002] Aircraft safety issues have been widely concerned by the society, and fuel tank combustion and explosion are one of the main causes of catastrophic safety accidents of aircraft. In 1996, a Boeing 747-100 series aircraft disintegrated over New York, resulting in the death of 230 people and causing a serious air crash (known as the TW800 flight accident in history). The US National Transportation Safety Board conducted an accident investigation, and the results showed that: The combustion explosion of the center wing fuel tank caused by an unknown ignition source was the main culprit of the accident. After reviewing the operating records of transport aircraft in the world in the past 40 years, the American Aviation Regulation Advisory Committee found that there were at least 16 accidents cau...

AI Technical Summary

Problems solved by technology

[0005] However, judging from the application status at home and abroad, there are still many problems in the inerting technology of hollow fiber membrane onboard nitrogen production, such as the need for engine bleed air, which makes it unusable on many models (such as helicopters), and the separation membrane efficiency due to the open loop of the system. Low air quality leads to large compensation loss of the aircraft, gradual clogging of small membrane filaments and permeable pores, serious membrane performance attenuation caused by ozone in the air source, and fuel vapor leakage and pollution of the environment when the fuel tank is filled with nitrogen, etc.

Images