太阳能烟囱结构对通风效果影响的数值研究

Numerical study on impacts of solar chimney structure on ventilation effects

采用Realizable K-ε湍流模型和DO辐射模型对太阳能烟囱内部的流场和温度场进行了数值模拟,计算结果与文献中实验值吻合得较好。对太阳能烟囱高度和宽度等结构因素对通风效果的影响进行了模拟分析,结果表明,诱导风量随烟囱高度增大而增大,随宽度增大先增大后减小;Gr可作为设计太阳能烟囱高度时的参考;渐缩型通道能有效防止通道内回流的产生。

Numerically simulates the flow and temperature fields inside solar chimney by Realizable K-ε turbulent model and DO radiation model,and the numerical results agree well with experimental data from related papers.Simulates and analyses the influence of chimney height and width on ventilation effects.The results show that the induced flow rate increases with the increase of the height,while it first increases and then decreases with the increase of the width;Grashof number plays an important role in determining the optimal chimney height;Recirculating flow in the chimney could be prevented by adopting the shrinking cross section.