中文摘要：

本文针对具有多管梯形腔式吸热器的线性菲涅尔（LFR）系统及其光能聚集与光热转换复杂过程,提出了一种基于蒙特卡罗光线追迹法（MCRT）和有限容积法（FVM）的三维MCRT-FVM光热耦合计算方法。该耦合方法采用MCRT计算系统光能聚集过程,而采用FVM计算吸热器内的光热转换过程,同时两种方法在吸热器内进行耦合,从而实现了对系统光能聚集与光热转换过程的直接研究。在此基础上,采用该方法进一步分析了系统光学性能、吸热器温度特性以及系统光热转化性能。研究结果表明,该方法具有较高的准确性和可靠性,可实现对LFR系统聚光与光热转换性能的直接研究与预测,所获得的系统性能参数可进一步指导LFR系统的设计和性能优化。

英文摘要：

In this paper,a new simulation method and corresponding model were presented by coupling Monte Carlo Ray Tracing（MCRT） method and Finite Volume Method（FVM） for modeling the complex energy conversion process in the linear Fresnel reflector（LFR） with a trapezoidal cavity receiver（TCR）.In the model,firstly,the solar concentrating process from the sun to the TCR is simulated by MCRT,and the photo-thermal conversion process in the TCR is modeled by FVM.Then,the two parts are coupled in the TCR by transferring the absorbed energy computed by MCRT to FVM,and this energy is applied as a source term of the energy equation in the FVM part.Based on the model,the optical and thermal performance of the LFR and the temperature characteristics of the TCR were studied at various conditions.The results indicate that the method which is proved to be accurate and reliable is an effective method for studying the complex energy conversion process in the LFR directly.The results of the LFR performance study can also provide a reference to the design and optimization of the LFR system.