碟式太阳能热发电系统流固耦合模态分析  

Modal analysis on dish solar thermal power system considering fluid-solid interaction

作　　者：鄂加强[1,2,3] 张庆玲[2] 杨文明 刘腾[2] 王曙辉[1,2] 王红林[2] 苏秀超 左威[2] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学机械与运载工程学院,湖南长沙410082 [3]Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore

出　　处：《中南大学学报（自然科学版）》2015年第9期3546-3552,共7页Journal of Central South University:Science and Technology

基　　金：国家留学基金资助项目(201208430262);武器装备预研重点项目(9140A2011QT4801)~~

摘　　要：为避免碟式太阳能热发电系统风激共振破坏问题,采用流体控制方程建立碟式太阳能热发电系统流场模型,并将计算得到的碟式太阳能热发电系统流场流速和压力再加载到聚光器前后表面,对碟式太阳能热发电系统流固耦合模态进行分析研究。研究结果表明:流固耦合场对碟式太阳能热发电系统模态振型的影响较小,而对碟式太阳能热发电系统的固有频率和最大变形量的影响较大,但其影响程度随模态阶数的递增而递减;与高度角β=0°时碟式太阳能热发电系统固有频率相比,高度角β=45°时碟式太阳能热发电系统固有频率均不同程度地减小,但最大变形量基本上保持不变;碟式太阳能热发电系统聚光器的上边缘以及4个悬臂梁靠近电机的部分最容易受到损坏,故应提高此部位的刚度。In order to avoid resonance destruction problem of dish solar thermal power system caused by wind excitation, the fluid control equations were used to establish the flow field model of dish solar thermal power system. Moreover, the calculated flow velocity and pressure of flow field of the dish solar thermal power system were loaded onto the front and rear surfaces of the condenser, and modal analysis on fluid-structure interaction of dish solar thermal power system was carried out. The results show that the fluid-solid interaction field has little effect on the modal shape of dish solar thermal power system and that the natural frequency and the maximum deformation of dish solar thermal power system are impacted more seriously, although the influence degree shows a decreasing tendency with the increase of mold order. Compared with the natural frequencies of dish solar thermal power system at different azimuth angles when the elevation angle β=0°, it has corresponding decrease while the maximum deformations remain essentially unchanged when β=45°. The upper edge of the dish solar thermal power system condenser and the portions near the motor of four cantilever beams are most susceptible to be damaged, so the rigidity of these parts should be enhanced properly.

关 键 词：碟式太阳能热发电系统 聚光器 流固耦合 模态分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]