CAJ | 학술논문

针对临近空间飞艇，对其内部氦气的自然对流特征进行了数值模拟。采用计算流体力学方法，并利用自编的用户自定义函数将外部的温度边界条件导入壁面网格。在不同的稳态条件下，通过对内部氦气压力、温度、速度的分布等流场特征参数的研究，分析了临近空间飞艇内部气体自然对流的运动特性及其影响规律，并对自然对流非稳态变化过程进行了初步的探索。仿真结果表明，在临近空间环境下，飞艇内部氦气的自然对流，对于内部氦气自身的热交换具有一定程度的促进作用，而对蒙皮受力和结构安全性影响很小。
침대림근공간비정，대기내부양기적자연대류특정진행료수치모의。채용계산류체역학방법，병이용자편적용호자정의함수장외부적온도변계조건도입벽면망격。재불동적은태조건하，통과대내부양기압력、온도、속도적분포등류장특정삼수적연구，분석료림근공간비정내부기체자연대류적운동특성급기영향규률，병대자연대류비은태변화과정진행료초보적탐색。방진결과표명，재림근공간배경하，비정내부양기적자연대류，대우내부양기자신적열교환구유일정정도적촉진작용，이대몽피수력화결구안전성영향흔소。
Aiming at the near space airship,the natural convection characteristics of the helium inside an airship were simulated numerically. On the basis of the computational fluid dynamics method and user-defined function,external temperature boundary condition was imported into the wall grids.Under conditions of different steady states,the motion characteristics and influence regulations of gas natural convection inside the airship were analyzed by researching the characteristic parameters of flow field,such as distribution of pressure,temperature,speed.Besides,the unstable change process of natural convection was also studied preliminarily.The simulation results show that natural convection of helium inside a near space airship has some active influence on heat exchange of inside helium,but the influence is very weak on stressed skin and structural safety.