长扁圆形烟囱表面压力分布数值分析与试验研究

Numerical Analysis of Surface Pressure Distribution of Long Flat Circular Chimney

现有荷载规范中没有涉及横截面为长扁圆形的烟囱风荷载问题,通过商用软件Fluent求解Realizable形式的时均k-ε湍流模型,得到了长扁圆形烟囱宽面迎风、窄面迎风时表面压力。研究了多种风向角时烟囱的基底弯矩、底部最大正应力,研究发现风向角改变时烟囱底部最大正应力值也变化。其结果与风洞试验结论一致,可供修订风荷载规范时参考。

The wind load problem for long flat circular chimney is not involved in existing load code.A commercial computational software ＂Fluent＂ was employed to solve the time-averaged k-e turbulent flow model for Realizable form.The pressure distribution upon windward surface on the long fiat chimney was obtained for the wide-face and the narrow-face.The bending moment and maximum positive stress at the bottom of the chimney were studied.The maximum positive stress of the chimney at the bottom of the chimney was also changed when the direction of the wind changes.The wind direction was the worst when the wind direction was 750.The numerical simulations were consistent with the wind-tunnel experimental results.These discoveries can be used as a reference for the new version of the wind load criteria.