Research On Heat Management Of UAV Fuel Environment Control System Based On Liquid Nitrogen Cooling

With the rapid development of aviation,the use of UAV in military and civil aspects is generally increasing,and its tasks include many aspects.In order to meet its task requirements,the number of electronic equipment carried by UAV increases sharply,and the thermal load generated by the work of electronic equipment also increases.In order to ensure that UAV can successfully complete the task,it is particularly important to study the heat management system of UAV.Based on the analysis of the thermal load of the internal system and the heat transfer between the systems of a UAV,the integrated heat management system is designed according to the design requirements of heat dissipation and refrigeration of the UAV;By the mathematical modeling of the key components of each subsystem and the media in the system,the key components are verified;In order to meet the needs of the design plan,the local cooling of the electronic cabin was carried out by means of liquid nitrogen spray cooling.The low temperature nitrogen produced was used as the cold source for the two time.The liquid nitrogen nozzle was selected and the liquid nitrogen nozzle was selected to complete the dynamic simulation of the internal temperature change of the electronic cabin.The feasibility of using liquid nitrogen spray to cool UAV electronic cabin is verified.The low-temperature nitrogen discharged from the electronic cabin is used as one of the cold sources of the heat management system,and the fuel oil is used as the heat transfer medium throughout the whole heat management system to collect the heat of the hydraulic system,lubricating oil system and power system,and then cooled by low-temperature nitrogen.Using the established mathematical model,the simulation calculation model of the integrated heat management system is built,the feasibility of the system under the ground thermal limit condition is verified,and the heat dissipation efficiency of the integrated heat management system is optimized by changing the fuel flow in the system and the air introduction use of low-temperature nitrogen,and considering the feasibility of using new materials as fuel tank materials.