Device and method for backwashing and inerting oil tank of military unmanned aerial vehicle by utilizing fuel oil

Abstract

The invention discloses a device and method for backwashing and inerting an oil tank of a military unmanned aerial vehicle through fuel oil. The device comprises a first air generation unit, a hollowfiber membrane air separation assembly, a first electromagnetic valve, a second air generation unit, a second electromagnetic valve and a mixing valve. The first air generation unit, the hollow fibermembrane air separation assembly and the first electromagnetic valve are connected in sequence; the second air generation unit is connected with the second electromagnetic valve; the mixing valve is provided with a first inlet, a second inlet and an outlet; outlets of the first electromagnetic valve and the second electromagnetic valve are connected with a first inlet and a second inlet of the mixing valve correspondingly, and an outlet of the mixing valve communicates with the bottom of the unmanned aerial vehicle oil tank. The military unmanned aerial vehicle fuel tank is backwashed and inerted through fuel oil, the situation that an aircraft carries a hollow fiber membrane air separation assembly can be avoided, the aircraft weight is reduced, and the influence of engine high-pressure air entraining on the maneuvering characteristics of an unmanned aerial vehicle is reduced.

Description

technical field [0001] The invention belongs to the field of fire prevention and explosion suppression of military unmanned aerial vehicle fuel tanks, relates to a device and method for inerting military unmanned aerial vehicle fuel tanks, in particular to a device and method for inerting military unmanned aerial vehicle fuel tanks by backwashing with fuel. Background technique [0002] Flight safety accidents occur from time to time, and lead to the tragedy of aircraft crash and loss of life and property. Among them, the combustion and explosion of aircraft fuel tanks is one of the main reasons for aircraft accidents. During the Vietnam War, the main cause of thousands of U.S. Air Force plane crashes was the burning and explosion of aircraft fuel tanks caused by small anti-aircraft weapons attacks on the ground. [0003] Studies have shown that when the oxygen concentration in the gas phase space is higher than the minimum limit oxygen concentration (LOC) required for fuel ...

AI Technical Summary

Problems solved by technology

[0005] However, under a given flight envelope, the ground scrubbing and inerting method cannot fully guarantee that the oxygen concentration in the gas phase space of the fuel tank is always within 9% of the flammable limit concentration during the flight, and with the increase of the initial oxygen concentration and the increase of the fuel loading rate increase, the probability of the oxygen concentration in the gas phase space exceeding 9% is also greater

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