Unmanned aerial vehicle fuel oil supply system and oil supply and refueling control methods

Abstract

The invention discloses an unmanned aerial vehicle fuel oil supply system and oil supply and refueling control methods. In the system, one part of an oil tank set is connected with a pressurizing oil pump through a first pipeline; the pressurizing oil pump is connected with a pressurizing oil tank through a third pipeline; the other part of the oil tank set is connected with an oil filling port through a second pipeline; the pressurizing oil tank is connected with the engine through an oil supply assembly. A four-way joint is arranged between the pressurizing oil pump and the first pipeline, and one end of the four-way joint is connected with the second pipeline through a fuel sequence control valve; the controller is connected with the pressurizing oil pump, the oil supply assembly and the fuel oil sequence control valve. The controller is further connected with a flight control computer and used for receiving the pressurization instruction and sending the oil pressure and the flow value. By means of the oil supply system, the oil supply system has the relative pressure ranging from 25 kpa to 50 kpa within the height range from 0m to 20,000 m under the condition that the use overload ranges from 1 g to 6 g to guarantee that oil is smoothly supplied to an engine.

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicle fuel supply equipment, and in particular relates to an unmanned aerial vehicle fuel supply system and a fuel supply and refueling control method. Background technique [0002] The long-endurance UAV is a large maneuverable recyclable UAV system, which has the advantages of stealth, high speed (high subsonic to supersonic speed), and large maneuverability (stable 6G, instantaneous 9G). The layout is characterized by a slender fuselage and a large fuel load. During take-off and flight, especially during large maneuvering flights, it is easy to cause drastic changes in the center of gravity caused by fuel slosh. At the same time, the flight envelope flight altitude ranges from 0 to 12,000 meters The high pressure changes drastically, and the oil supply end of the engine requires constant pressure oil supply. [0003] The design schemes adopted in the prior art of pressure-holding oil...

AI Technical Summary

Problems solved by technology

[0004] Now, from small drones to large drones, composite material structures are basically used, and most of the connections between the body structures (whether it is fiberglass, carbon fiber or other composite materials) are glued, especially for aircraft. The connection between the skin of the fuselage and the fuselage frame and the beam, and the peeling strength of the glued structure is very low, and the pressure input in the fuel tank compartment is exactly to produce this extremely destructive tension, that is, the peeling force; once Delamination between structural connections will sharply reduce the strength of the aircraft structure, and in severe cases, the aircraft will disintegrate

In addition to peeling damage, this pressure will also cause the relevant aircraft shape to bulge and deform, destroy the aerodynamic shape of the aircraft, increase the resistance of the aircraft, and degrade the flight performance of the aircraft. In order to ensure that the aircraft structure can withstand this inflation pressure, the structural design must be Taking this load into consideration, the structural strength is increased beyond the structure required for the aircraft to bear the aerodynamic load, that is, the thickness of the structural panels is increased, and the bonding surface is increased, thereby greatly increasing the weight and materials of the aircraft structure and increasing The difficulty and manufacturing cost of the related manufacturing process

[0005] In addition, in order to pressurize, the airframe structure must also be sealed. This seal must withstand the flight aerodynamic load and at the same time withstand the inflation pressure of the inflation, and ensure that the airframe cannot deform (bend and twist) under various stress conditions. It causes air leakage in the airtight cabin. Once the air leaks, it will not be able to supply fuel to the engine, resulting in a serious accident of parking in the air; it is also difficult to re-seal during repair, which requires high body structure design and manufacturing technology, and also greatly increases the cost.

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