太阳能气球战场观瞄台载体温度场仿真分析

Temperature Field Simulate Analysis on Solar Balloon Carrier of Battle Reconnaissance Viewer-Sight Platform

为提高新型太阳能气球战场信息观瞄台的升空性能和稳定性,对太阳能气球载体进行热特性分析至关重要。为了研究载体在太阳辐射下的温度分布情况,对载体进行简化,根据计算传热学和辐射传热学理论对载体进行热分析,建立了载体的复合换热模型,利用FLUENT软件,对载体温度场进行三维数值仿真,并用TECPLOT软件分析计算结果。计算采用离散坐标辐射模型,加载太阳计算器,同时采用对流-辐射混合热边界条件。结果发现:在靠近载体壁面处的温度梯度较大,而内部中心区域温度则变化缓慢;当在太阳辐射下达到平衡状态时,蒙皮最高温度约为343K,内部空气的平衡温度约为334K,蒙皮最大温差约为20K。数值仿真获得了载体蒙皮和内部空气的温度分布规律,为进一步的动力学研究和实验研究奠定了理论基础。

In order to improve levitation performance and stability of new - type battle information viewer - sight platform, analysis on thermal characteristics of the solar balloon carrier is of great importance. In order to study the temperature distribution under the solar radiation, a physical model of carrier was simplified. And then a thermody- namic model of solar balloon carrier was set up according to numerical heat transfer and radiation heat transfer theory. Under this background, a conduction and radiation heat transfer model of carrier was established. This three - dimen- sional heat transfer model was studied using FLUENT software and the results were processed based on TECPLOT software. In the study, we used Discrete Ordinates radiation model and loaded sun position calculator, and then mixed （convection- radiation） heat boundary condition was used. The simulation results indicate that the tempera- ture gradient near the balloon skin is much larger, to the contrary, the core temperature is slow - varying. And under the equilibrium state, the highest temperature on balloon surface is 343 K, the average temperature of the internal air is 334K and the maximum temperature difference is 20K or so. The numerical simulation gets the temperature distri- bution regularities of carrier＇s skin and interior air, and the research lays some theoretical foundations for further study on kinetics and experiment.