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中文摘要：
建立了有压腔式吸热器的光学模型,采用Monte Carlo光线追迹法(MCRT)对吸热器中太阳辐射传播、吸收过程进行了模拟研究。在光线追迹计算中,将非连续多孔结构吸热体中的光线传播过程近似为各向同性均匀连续浑浊介质中的传播过程,并对多孔结构吸热体区域内网格做了局部加密处理,采用非均匀网格统计各个网格吸收的光子能量权值之和,从而在较低计算资源消耗的前提下实现了大尺度非规则多孔结构吸热体内的热流分布计算。计算结果表明,在给定工况条件下多孔结构吸热体所吸收的太阳辐射热流集中于吸热体的顶部区域,局部热通量极值达到了2.87×109W·m-3,而在吸热体的两侧,热通量迅速减小,整个吸热体内的太阳辐射热流分布呈现出极不均匀的特征,从而影响吸热器系统运行的稳定性和安全性。
英文摘要：
建立了有压腔式吸热器的光学模型,采用Monte Carlo光线追迹法(MCRT)对吸热器中太阳辐射传播、吸收过程进行了模拟研究。在光线追迹计算中,将非连续多孔结构吸热体中的光线传播过程近似为各向同性均匀连续浑浊介质中的传播过程,并对多孔结构吸热体区域内网格做了局部加密处理,采用非均匀网格统计各个网格吸收的光子能量权值之和,从而在较低计算资源消耗的前提下实现了大尺度非规则多孔结构吸热体内的热流分布计算。计算结果表明,在给定工况条件下多孔结构吸热体所吸收的太阳辐射热流集中于吸热体的顶部区域,局部热通量极值达到了2.87×109W·m-3,而在吸热体的两侧,热通量迅速减小,整个吸热体内的太阳辐射热流分布呈现出极不均匀的特征,从而影响吸热器系统运行的稳定性和安全性。
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