环境风洞红外消冰过程模拟研究

Numerical study on infrared deicing process in climatic wind tunnels

为快速消除环境风洞内部地面积冰,提出一种利用风洞内部辐照模拟系统进行红外消冰的除冰方法;通过构建试验段辐照强度分布计算模型和三维非稳态相界面追踪相变过程数理模型,模拟研究环境风洞在红外消冰工况下的地面冰层融化过程。结果表明:红外消冰工况下积冰完全融化时间为2~6 h,冰层自上而下、自边缘往中心发生融化,且可在融化过程中形成倒梯形的冰型,有利于在红外消冰的过程中加入机械除冰,提高除冰效率。冰层厚度每增加10 mm,积冰层完全融化时间就推迟约1.2 h,较大的积冰厚度会使融冰过程中冰型的倒梯形性质变得更明显。

In order to solve residence ground freezing problem in climatic wind tunnels,an infrared deicing method was proposed by utilizing inner radiation simulation system.A calculation model of radiation distribution and a mathematical model of three-dimensional unsteady phase-change process were established to study melting process of ground ice layer in climatic wind tunnels.The results show that the complete melting time of ground ice under infrared deicing conditions is 2-6 hours.The ice layer melts from top to bottom,from edges to the center,and an inverted trapezoidal ice shape can be obtained in melting process,which enables addition of mechanical deicing during infrared deicing to improve deicing efficiency.Moreover,the melting time of ice layer will reduce by 1.2 hours for each increase of thickness by 10 mm.The greater thickness leads to more significant inverted trapezoid ice shape.