针对碟式光热系统中机械位移场对吸热腔能流分布的影响，提出以光-机-热多场耦合角度建立热腔能流分布数学模型。分析系统光机热多场耦合机制，确定不同位移场模式对聚光器的影响尺度。基于镜面单元的刚体假设，提出将宏观机械位移场(安装误差、跟踪误差和机架承载位移)作用等效为镜面单元的刚体系列运动，推导宏观机械位移场对镜面单元内任意点位置的影响矩阵，并引入面形误差得到了镜面各点法线矢量的影响矩阵。考虑机架承载后镜面单元与吸热器的空间位移协调性，基于光线跟踪方法，建立光能传输与腔式吸热器能流分布的光-机-热多场耦合数学模型。在Matlab 7.0平台编制能流分布求解及数据接口程序，融合Fluent 6.3和ANSYS 12.0搭建了聚光性能预测的仿真平台。并针对光线与热腔求交效率低，提出采用包围盒实现快速碰撞检测，且以多段锥曲面拟合并替代高次热管曲面的方法进一步加速求交计算。以在研的38 kW级碟式系统为实例，基于搭建的仿真平台开展典型风载工况与跟踪误差对热腔能流分布的影响，对仿真平台进行验证，为后续碟式机架面向聚光性能的综合优化提供理论基础。

For the problem of receiver flux distribution affected by the mechanical displacements of the dish system, the receiver flux distribution mathematical model is put forward. The system thermal/structural/optical coupled-field mechanism is analyzed and then the influences of different displacement model on the concentrator is identified. Based on the reflect unit as rigid unit, the mechanical displacements is regarded as the mirror unit do the rigid body motion, and the influence matrix of the mechanical displacement to the unit has been deduced. after introducing the surface error, the unit normal vector influence matrix received. Considering the Spatial displacement coordination about the reflector which under the pressure and receiver, Based on the ray tracing method,the multi-field coupling model and the simulation platform was built which combined with Fluent 6.3, ANSYS 12.0 and Matlab 7.0 software. In order to improving the calculating efficiency, the methord of using bounding box to implement the fast collision detection has been putforward, and found that using Multistage cone surface to fitted the pipe surface can also improve the solution speed. Based on the 38 kW dish system, the simulation platform was built,and the influence of the typical working condition of wind load and the tracking error on the flow distribution has been analyzed. The result proved the validity of the simulation platform and present a reference for the comprehensive optimization of the dish system.