液滴辐射器液滴层的优化设计

为有效提高液滴辐射器液滴层的辐射热通量，建立了矩形液滴辐射器三维液滴层非稳态辐射传热模型。采用FLUENT软件，针对液滴层辐射换热过程进行了模拟。数值分析了液滴分布特征、液滴初始温度、飞行速度、液滴间距、直径、液滴层长度及质量流率等7种因素与液滴层辐射热通量的关系及对其敏感度，提出了一种新的液滴层结构型式——中空型液滴层。结果表明，除液滴层长度和质量流率外，液滴间距和初始温度对辐射器液滴层的传热功率影响较大。在厚度方向液滴层数为100层、质量流率为12kg/s的条件下，中空型液滴层设计能将单位质量辐射热通量提高2~3倍。

Optimal design of droplet layer in liquid droplet radiator

To improve the radiation heat flux in the droplet layer of liquid droplet radiator, a 3D unsteady radiation heat transfer model of the rectangular droplet radiator was established. The radiation heat transfer process of droplet layer was simulated by FLUENT. The influence and sensitivity of droplet distribution characteristics, initial droplet temperature, flow rate, droplet spacing, diameter, droplet length and mass flow rate on the radiation heat flux of droplet layer were analyzed numerically. A new droplet layer structure,hollow droplet layer，was proposed. Results show that apart from flight time and mass flow rate, droplet spacing and initial temperature have great influence on the heat transfer power of the droplet layer of radiator. Under the condition that the number of droplet layers in the thickness direction is 100 and the mass flow rate is 12 kg/s, the design of hollow droplet layer can increase the heat flux per unit mass by 23 times.