大型冷却塔双塔干扰的风洞试验研究

Study on interference effects of two large hyperbolic cooling towers by using wind tunnel test

采用风洞试验方法研究双塔情况下冷却塔的风致干扰问题,通过增加模型表面粗糙度的方法以补偿模型试验的雷诺数效应,应用POD方法进行风压点的插值和加密,计算单双塔的阻力系数、升力系数和底部剪力系数,并分析干扰系数随塔间距、风向角的变化规律。研究表明,单塔情况下,平均阻力系数较大,平均升力系数为零;阻力系数和升力系数的标准差数据相当。双塔情况下,阻力系数的平均值和极大值对应的干扰系数几乎相同;对于升力系数极大值的干扰系数,大部分数据大于1,最大的数据达1.75。

Wind tunnel tests were employed to study wind-induced interference effects of two adjacent cooling towers.The technique of adding roughness on model surface was applied to compensate the Reynolds number effect due to model tests.Then the POD（proper orthogonal decomposition） method was used to interpolate the wind pressures on the towers.Drag coefficients,lift coefficients and base shear coefficients on an isolated tower and on two adjacent towers were calculated respectively.Based on these coefficients,interference factors with respect to distances between two towers and wind azimuths were analyzed.Results show that,for the isolated tower,the mean drag coefficients are quite large whereas the mean lift coefficients are nearly equal to zero.However,the root-mean-squares of drag coefficients and lift coefficients on the isolated tower are comparative in the magnitude.For two adjacent towers,the interference factors corresponding to mean and maximum of dynamic drag coefficients are almost the same.Most of the interference factors corresponding to dynamic lift coefficients are bigger than 1,while the biggest value reaches 1.75.