Numerical Simulation And Experiment For Thermal Behavior Of Stratospheric Electronic Equipment

Stratospheric aerostats plays an important role in pre-alarming monitoring,transportation,navigation,telecommunication research and scientific detection with its inherent capabilities of low speed,long duration flight and fast response.Aircraft need to carry a large number of electronic equipment in the course of operation,which requires strict working temperature.The thermal characteristics of stratospheric are much different from that of satellites and land-based facilities because of the special stratospheric environment.In this paper,the numerical simulation and experimental methods are carried out to investigate the influence of the external environment and the structure of the electronic equipment on the thermal characteristics during duration and ascent process.Firstly,a space environment experiment is carried out.The temperature characteristics of the electronic equipment are preliminarily tested using the space environment test device to simulate the environmental parameters such as temperature,pressure and solar radiation.The results show that the influence of solar radiation on the temperature of electronic equipment is 20 K,the heat dissipation effect of BOTTOM components is better than that of TOP surface,and the maximum temperature difference between different components is 50 K.Secondly,a numerical simulation model is established to compare with the experiment,considering the structure and physical parameters of the test model and taking experimental conditions as the boundary conditions of numerical simulation.The calculated results are compared with the experimental results and the results show that the temperature variation is basically consistent with the experimental results,which proves the reliability and correctness of the numerical analysis model and physical model.Finally,the thermal characteristics of electronic equipment during duration and ascent process are analyzed.The results show that solar radiation,wind velocity and location have different effects on the temperature and the wind velocity has a greater impact on the temperature of electronic equipment.The convection and radiation heat dissipation in different working scenarios are concluded and which shows that forced convection and radiation can affect the temperature of the stratospheric electronic equipment,and the convection heat dissipation is the main factor.The results of this paper will provide important reference for stratospheric thermal design and thermal management.