A device and method for inerting a military unmanned aerial vehicle fuel tank by backwashing with fuel

Abstract

The invention discloses a device and method for backwashing and inerting military unmanned aerial vehicle fuel tanks by using fuel oil. The device includes a first air generating unit, a hollow fiber membrane air separation module, a first electromagnetic valve, a second air generating unit, a second Solenoid valve and mixing valve; the first air generating unit, the hollow fiber membrane air separation module and the first solenoid valve are connected in sequence; the second air generating unit is connected to the second solenoid valve; the mixing valve has a first inlet, a second inlet and an outlet ; The outlets of the first solenoid valve and the second solenoid valve are respectively connected with the first inlet and the second inlet of the mixing valve, and the outlet of the mixing valve communicates with the bottom of the UAV fuel tank. The invention utilizes fuel backwashing to inert the fuel tank of the military unmanned aerial vehicle, which can prevent the aircraft from carrying the hollow fiber membrane air separation module, reduce the weight of the aircraft, and reduce the influence of high-pressure bleed air of the engine on the maneuverability of the unmanned aerial vehicle.

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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