结构参数和扰流参数对塔式太阳能接收器吸热管周向温差的影响  

Effects of structural and disturbing flow parameters on circumferential temperature difference in tower solar receiver

作　　者：刘赟[1] 李金芳[1] 李永华[1] LIU Yun;LI Jinfang;LI Yonghua(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学能源动力和机械工程学院,河北保定071003

出　　处：《中南大学学报（自然科学版）》2018年第7期1823-1830,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51706072);中央高校基本科研业务费面上资助项目(2015MS120)~~

摘　　要：通过改变吸热管的结构、在吸热管内插入扰流件的方法来减小塔式太阳能吸热管周向温差,提高接收器可靠性。与传统定温或定热流密度边界条件不同,采用HFCAL模型模拟实际非均匀太阳辐射分布,采用直圆管、渐缩管和渐扩管作为塔式太阳能接收器的吸热管结构,并进行对比分析。进一步分析不同扩张比渐缩管对周向温差的影响。研究结果表明:与光管和渐扩管相比,渐缩管聚光区与非聚光区的温差大幅度降低;周向温差随扩张比的增大而减小,当扩张比为20/16时效果较好,温差减小10%,压损为0.05 Pa;在渐缩管内插入扭曲片可进一步减小吸热管的周向温差,有效提高接收器可靠性。In order to improve the reliability of solar tower receiver,the different absorber structures and the twisted-tape insert were developed to homogenize the circumferential temperature distribution.Different from the traditional given temperature and heat flux boundary condition,in this contribution,the HFCAL model was applied to simulate the actual non-uniform solar flux distribution on the receiver tubes,and the cylinder pipe,tapered conduit and diffuser tube were used as absorbers to analyze the convective flow and heat transfer.Based on those models,the effects of expansion ratio of the tapered conduit were analyzed.The results show that the circumferential temperature difference of the tapered conduit is the smallest.The circumferential temperature difference decreases with the increase of the expansion ratio.The excellent effect can be obtained when the expansion ratio is 20/16,and the temperature difference reduces by 10%,and the pressure loss is only 0.05 Pa.Finally,adding the twisted-tapes to the tapered conduit can further reduce the circumferential temperature difference and improve the reliability of receiver.

关 键 词：塔式太阳能 接收器 周向温差 扭曲片 

分 类 号：TK514[动力工程及工程热物理—热能工程]