激光供能换热器概念设计及性能分析

针对换热器模式激光推进的特点,设计了一种新颖的平板式换热器结构,这种结构由多层异质材料复合外壳、耐高温金属框架和层流微通道组成,具有较高的激光-热转换效率。建立了换热器出口截面二维温度场模型并进行数值分析,其结果验证了换热器结构的热稳定性。建立了换热器内部流体一维流动模型并进行数值分析,得出了激光辐照功率密度和流体入口速度对换热器内部流体温度分布的影响关系,验证了换热器结构设计满足流体通道压降小的要求。

Analysis of performance and design of concept for laser-powered heat exchanger

Based on the characteristic of laser-powered heat exchanger(HX) for rocket propulsion,a novel preliminary structure design of flat-plate HX was presented.Key component parts of the HX include outer shell of multilayer composite materials,high temperature resistant metals frame and internal laminar micro-channel structure of nickel alloy.High coupling efficiency for laser energy to material heat was predicted for this structure.A twodimensional temperature field model for the HX exit section was presented,and numerical results confirmed the heat stability design.A one-dimensional flow model for inner propellant in HX was developed and numerically analyzed,which gained a influence orderliness that correlating HX outlet temperature with laser radiation power density and inlet flow velocity.Pressure drop in micro-channel was well small within the specified range.