基于三维透平的渐扩式太阳能热气流发电系统性能分析  

Performance analysis of divergent solar chimney power plant system based on 3D turbine

作　　者：李德飞 桂浩瑜 刘杨 吴永佳 明廷臻[1] LI Defei;GUI Haoyu;LIU Yang;WU Yongjia;MING Tingzhen(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《热力发电》2020年第6期46-52,共7页Thermal Power Generation

基　　金：国家自然科学基金(51778511);湖北省自然科学基金(2018CFA029);武汉理工大学ESI学科提升计划重点项目(2017001)。

摘　　要：本文以西班牙电站模型为研究对象,通过改变烟囱出口半径,设计了6种不同扩散角的烟囱;再结合太阳加载模型和离散坐标辐射模型,考虑系统真实的三维透平运行情况,研究了渐扩式太阳能热气流发电系统的性能及最佳扩散角。结果表明:对于该系统模型,系统正常运行的最佳扩散角为2.0°;当烟囱扩散角为2.5°时,烟囱内的流线发生紊乱,出现了边界层分离及回流现象;同一透平转速下,随着烟囱扩散角增大,透平处压降也增大,但继续增大烟囱扩散角透平处压降的增长趋势减弱,且在烟囱扩散角为2.5°时,透平压降反而低于烟囱扩散角为2.0°时的透平压降;当烟囱扩散角为2.0°时,透平发电量最大为64.15 kW,系统效率最大为0.167%,是烟囱扩散角为0°时的1.4倍。Taking the Spanish power station model as the research object,six kinds of chimneys with different divergence angles are designed by changing the chimney outlet radius.Moreover,combined with the solar load model and the discrete coordinate radiation model,the performance and the optimal divergence angles of the solar chimney power plant system are studied by considering the real three-dimensional turbine operation.The results show that,the optimal divergence angle of the system is 2.0°.When the divergence angle of the chimney is 2.5°,the streamline in the chimney is disturbed,and boundary layer separation and reflux occur.At the same rotational speed of turbine,the pressure drop at the turbine increases with the chimney divergence angles,but the increase trend weakens gradually.Especially,when the chimney divergence angle is 2.5°,the turbine pressure drop is lower than that when the chimney divergence angle is 2.0°.When the chimney divergence angle is 2.0°,the maximum power output of the turbine is 64.15 kW,and the maximum system efficiency is 0.167%,which is 1.4 times higher than that when the chimney divergence angle is 0°.

关 键 词：太阳能热气流发电系统 三维透平 扩散角 压降 发电量 系统效率 

分 类 号：TK514[动力工程及工程热物理—热能工程]