不同太阳能烟囱（SC）形状对系统集热特性影响不同。建立10°圆形SC数值模拟模型和试验台架,将系统数值模拟与试验测试结果对比验证,二者相对误差值小于4%,数值模拟方法正确;采用相同的数值模拟方法对0°圆形、0°方形和10°方形SC模型进行计算,将不同系统计算结果进行对比。结果表明：不同系统结构蓄热层表面温度场均匀性和受烟囱阴影影响不同,10°方形蓄热层表面温度场受烟囱阴影影响最小;对比烟囱内流体速度,10°方形具有更高速度梯度,更有利于确定涡轮机的位置;不同系统烟囱内部流体总焓差不同,10°方形SC系统总焓差较大;相比于0°圆形SC系统,其他3个SC系统的集热效率分别提高了11.328%、43.705%和66.061%,质量流量提升了59.36%、8.39%和39.04%。
Abstract
Different shapes of solar chimney （SC） systems have different effects on the heat collection characteristics of the system. A 10° circular SC numerical simulation model and a test bench were established. The comparision betweenthe numercial simulation and the test results showed that the relative error was less than 4%, which ensured the correctness of the model and numerical simulation method. The same numerical simulation method was used to calculate the 0° circle, 0° square and 10° square SC models, and the results of different systems were compared. The results show that the uniformity of the surface temperature field of the absorber varies with different system structures, and the influence of the chimney shadow on the surface temperature field of the 10° square absorber is the least. Compared with the fluid velocity in the chimney, the 10° square has a higher velocity gradient, which is more conducive to determining the turbine position. The total enthalpy difference of the fluid in the chimney of different systems is different, and the total enthalpy difference of the 10° square is larger. Compared with the 0° circular SC system, the collector efficiency of the other three SC systems is increased by 11.328%, 43.705% and 66.061%, respectively, and the mass flow rate is increased by 59.36%, 8.39% and 39.04%.
关键词
太阳能烟囱 /
集热棚形状 /
集热棚倾角 /
集热效率 /
数值模拟 /
不确定性分析
Key words
solar chimney /
collector shape /
collector inclination /
collector efficiency /
numerical simulation /
uncertainty analysis
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基金
内蒙古自然科学基金（2021LHMS05007）; 内蒙古工业大学博士基金（BS201933）; 内蒙古自治区重大专项（2019ZD0014）; 内蒙古自治区直属高校基本科研业务费项目（JY20220397）
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