化工学报 ›› 2011, Vol. 62 ›› Issue (S1): 60-65.

• 流体力学与传递现象 • 上一篇    下一篇

有压腔式吸热器内辐射传播过程的Monte Carlo模拟

崔福庆,何雅玲,程泽东,李东,陶于兵   

  1. 西安交通大学能源与动力工程学院,动力工程多相流国家重点实验室,陕西 西安 710049
  • 出版日期:2011-07-03 发布日期:2011-07-03

  • Online:2011-07-03 Published:2011-07-03

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。

关键词: 有压腔式吸热器;辐射热流分布;FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体" lang=EN-US>Monte CarloFONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">光线追迹;非均匀网格;浑浊介质

Abstract:

The optical model of the volumetric solar receiver has been built and corresponding solar radiation propagation process within the receiver is simulated by the Monte Carlo ray tracing methodMCRT.In the computationthe complicated photon transmission process in the SiC porous absorber is simplified as the transmission process in the statistically homogeneous and isotropic turbid media. Meanwhilethe non-uniform cylindrical coordinate grid is applied in the statistics of the absorbing energy distributionswhich could reduce much computation effort compared with normal uniform grid.Based on the above modelthe energy distribution of irregular macro scale porous absorber is counted.The results show thatunder the given working conditionthe radiation heat flux is concentrated at the top area of absorber and the maximum heat flux value is up to 2.87×109W有压腔式吸热器;辐射热流分布;FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体" lang=EN-US>Monte CarloFONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">光线追迹;非均匀网格;浑浊介质