Liquid hydrogen vaporization control method for hydrogen energy unmanned aerial vehicles

Abstract

The invention relates to the technical field of fuel management of hydrogen energy unmanned aerial vehicles, and particularly relates to a liquid hydrogen vaporization control method of a hydrogen energy unmanned aerial vehicle. The design requirement of heat insulation of a hydrogen storage container is reduced, and the liquid hydrogen vaporization capacity of the hydrogen storage container is controlled in real time by virtue of exhaust waste heat of an engine, so that the liquid hydrogen vaporization capacity is balanced with hydrogen fuel consumption in all flight conditions of the unmanned aerial vehicle, thereby effectively reducing the weight of a fuel management system of the hydrogen energy unmanned aerial vehicle, increasing the payload weight of the unmanned aerial vehicle, simplifying active vaporization control and reducing the spillage of liquid hydrogen. According to the liquid hydrogen vaporization control method, the liquid hydrogen vaporization capacity is controlled by utilizing the waste heat of the engine, the engine displacement is adjusted according to the hydrogen fuel consumption, and dynamic real-time control can be performed according to different hydrogen fuel consumption, so that the utilization efficiency of hydrogen energy is improved, the self weight of the hydrogen storage container is reduced, and a reliable and feasible method is provided for the fuel management of the hydrogen energy unmanned aerial vehicle.

Description

technical field [0001] The invention relates to the technical field of fuel management of a hydrogen energy unmanned aerial vehicle, in particular to a liquid hydrogen vaporization control method for a hydrogen energy unmanned aerial vehicle. Background technique [0002] Hydrogen energy UAVs generally use fuel cells or hydrogen fuel engines as power devices, and the patent of this invention is mainly aimed at UAVs that use hydrogen fuel engines as power devices. The density of liquid hydrogen at normal temperature and pressure is 845 times that of gaseous hydrogen, and the volume energy density of liquid hydrogen is more than 10 times higher than that of gaseous hydrogen. Therefore, most of the hydrogen energy drones in the world currently use liquid hydrogen storage. . Liquid hydrogen storage requires cooling hydrogen to -253 degrees Celsius to become a liquid, and then storing it in a high-vacuum insulated container for use. Due to the large difference between the liqui...

AI Technical Summary

Problems solved by technology

The inner layer of the traditional hydrogen storage container is generally made of metal materials with good hydrogen resistance (such as stainless steel). Due to the high requirements for thermal insulation design, the weight of the storage container is mainly consumed in the thermal insulation design. The hydrogen storage tank can only carry 17kg of liquid hydrogen, which has no great advantage over ordinary aviation gasoline or kerosene storage

At the same time, a liquid hydrogen storage tank with good heat insulation design also has high heat insulation requirements for the hydrogen supply pipeline, which increases the weight of the pipeline. At the same time, it needs to add a special vaporizer to vaporize the liquid hydrogen, which increases the design weight.

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