5kW太阳模拟器与斯特林发动机吸热器的辐射换热特性研究

Radiative Heat Transfer Characteristics Between 5 kW Solar Simulator and Stirling Engine's Heat Receiver

以设计的5 kW太阳模拟器为光源,加热斯特林发动饥的吸热器。首先以蒙特卡洛光线追迹法确定太阳模拟器与斯特林发动机吸热器间辐射热流分布,然后将辐射热流分布的计算结果以边界条件形式传递给CFD模型,对吸热器的温度分布特性进行数值计算;吸热器壁面温度采用安捷伦数据采集仪及热电偶温度计进行测试,吸热器壁面温度数值模拟结果与实验值的最大误差仅为4.7 K,太阳模拟器最大辐照度可达196个太阳常数,设计的5 kW太阳模拟器满足驱动1kW斯特林发动机的工作需求。

The designed 5 kW solar simulator is used as the light source to heat Stirling engine＇s heat receiver.First,the radiation heat flux distribution between the solar simulator and the Stirling engine＇s heat receiver is simulated by Monte Carlo ray-tracing method,Then the resulted radiation flux profiles are subsequently transferred to a CFD code as boundary conditions to numerically simulate the heat receiver＇s wall temperature distribution：the real wall temperature of Stirling engine＇s heat receiver is also tested by Agilent 34970A and thermocouples.The maximum error of heat receiver＇s wall temperature between calculated results and experimental test results is only 4.7 K,the temperature shows symmetrical distribution on the engine＇s heat receiver wall.The designed solar simulator can achieve 196 solar constant,it can provide enough heat to drive one 1kW Stirling engine.