基于立体打印自然通风冷却塔模型稳定性试验研究

为研究自然通风冷却塔在风载荷下的屈曲模式及临界风速,用立体打印技术打印了三个不同壁厚的缩尺模型,在风洞中完成了稳定性试验,并将实验结果与有限元计算结果进行对比分析.研究表明,模型失稳发生在弹性阶段,其壁厚与喉部半径之比是确定临界载荷的一个关键参数.实验得到的临界风压值同现有规范的设计相接近,约为有限元计算的1/4,说明我国现有规范中基于冷却塔整体稳定性得到的最小壁厚是偏保守的.

EXPERIMENTAL STUDY OF STABILITY OF NATURAL DRAFT COOLING TOWER MODEL BASED ON 3D PRINTING

In order to study the buckling and the critical wind speed of the natural draft cooling tower under wind loads, three scale models with different wall thicknesses are built by the 3D printing and then tested in the wind tunnel. The experimental results are compared with those obtained by the finite element method. The results show that the buckling occurs in the elastic region and the ratio of the wall thickness to the throat radius is the key parameter for the critical load. The critical wind pressures obtained by experiments are close to those designed by the current standards, which are about 1/4 of the results obtained by the finite element method, which shows that the design of the wall thickness based on the stability of the cooling tower in the current standard is conservative.