Numerical simulations of the solar transmission process for a pressurized volumetric receiver
Numerical simulations of the solar transmission process for a pressurized volumetric receiver
复制标题
加压体积接收器太阳传输过程的数值模拟
DOI：
10.1016/j.energy.2012.07.044
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发表时间：
2012-10
期刊：
影响因子：
9
通讯作者：
Cheng ZD
中科院分区：
文献类型：
--
作者：
Cui FQ;He YL;Cheng ZD
建立了加压容积接收器（PVR）的三维光学模型，并采用蒙特卡罗射线追踪（MCRT）方法模拟了太阳辐射在PVR内的传播过程。在计算中，将SiC多孔吸收体中复杂的光子传输过程简化为统计均匀各向同性混浊介质中的传输过程。同时，在能量分布的统计中采用了非均匀圆柱坐标网格，与常规均匀网格相比，可以大大减少计算网格的单元数量和计算时间。在此基础上，确定了不规则宏观尺度多孔吸收体中的能量分布，研究了入射角、吸收体形状和吸收体光学特性等系统参数对吸收体局部热流密度的影响。结果表明，在给定的工况下，辐射热流主要集中在吸收器顶部区域，最大热流值可达2.73 × 109 W m-3，而在吸收器侧面区域，辐射热流迅速减小。入射角和吸收器的相对狭窄的形状有助于降低吸收器中的最大热流密度。随着吸收系数/消光系数比值的减小，吸收体内的辐射能量分布更加均匀，吸收体内的最大热流密度大大降低。
A three-dimensional optical model for a pressurized volumetric receiver (PVR) is developed and corresponding solar radiation propagation process within the PVR is simulated by the Monte Carlo Ray Tracing (MCRT) method. In the computation, the complicated photon transmission process in the SiC porous absorber is simplified as the transmission process in the statistically homogeneous and isotropic turbid medium. Meanwhile, the non-uniform cylindrical coordinate grid is applied in the statistics of energy distribution, which could greatly reduce the number of cells in the computational grid and time compared with normal uniform grid. Based on the above model, the energy distribution in the irregular macro scale porous absorber is determined and then the effects of system parameters, including the incidence angle, the shape of absorber and the optical property of absorber, on the local heat flux of the absorber are investigated. The results show that, under the given operating condition, the radiation heat flux is mostly concentrated at the top area of the absorber and the maximum heat flux value is up to 2.73 × 109W m−3, but it quickly decreases in the sideward locations. The incidence angle and a relative narrow shape of absorber are helpful to reduce the maximum heat flux in the absorber. Furthermore, as the ratio of absorption coefficient/extinction coefficient decreases, the absorbed radiation energy distribution is more uniform and the max heat flux in the absorber decreases greatly.
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影响因子：
6.1
作者：
WANG, LH;JACQUES, SL;ZHENG, LQ
通讯作者：
ZHENG, LQ
DOI：
10.1115/1.2871853
发表时间：
1997-02
影响因子：
2.3
作者：
J. Karni;A. Kribus;P. Doron;R. Rubin;A. Fiterman;D. Sagie
通讯作者：
J. Karni;A. Kribus;P. Doron;R. Rubin;A. Fiterman;D. Sagie
DOI：
--
发表时间：
2008
期刊：
Science Technology and Engineering
影响因子：
--
作者：
Zuo Yuan-zhi
通讯作者：
Zuo Yuan-zhi
影响因子：
8.7
作者：
Zhihao Yao;Zhifeng Wang;Zhenwu Lu;Xiudong Wei
通讯作者：
Zhihao Yao;Zhifeng Wang;Zhenwu Lu;Xiudong Wei
影响因子：
2.3
作者：
Marc Röger;C. Rickers;R. Uhlig;Frank Neumann;C. Polenzky
通讯作者：
Marc Röger;C. Rickers;R. Uhlig;Frank Neumann;C. Polenzky