基于代理模型的储煤仓三心圆柱面屋盖气动外形优化研究

Aerodynamic Shape Optimization Study of a Three-centered Cylindrical Roof of Coal Bunker Based on Surrogate Model

以储煤仓三心圆柱面屋盖为研究对象,采用kriging代理模型对屋盖结构的气动外形进行优化研究。首先,选用标准k-ε、RNG k-ε和SST k-ω三种湍流模型对三心圆柱面屋盖的绕流特性进行数值模拟,并与风洞试验数据进行对比。其次,分别以屋盖表面负压峰值最小以及竖向位移绝对值最小为优化目标,对三心圆柱面屋盖中间圆弧的半径与屋盖跨度之比(R/S)和圆心角(θ)进行优化。研究结果表明:当R/S=1.26,θ=45.8°时,屋盖表面负压峰值最小;当R/S=0.56,θ=14.1°时,在平均风荷载作用下屋盖的竖向位移绝对值达到最小值。

This research focused on a three-centered cylindrical roof of coal bunker.Kriging surrogate model was adopted to optimize the aerodynamic shape of the roof structure.First of all,the flow characteristics of a three-centered cylindrical roof were numerically simulated by using standard k-ε,RNG k-εand SST k-ωturbulence models,and compared with the wind tunnel data.Secondly,radius-to-span ratio(R/S)and central angle(θ)of middle arc of the three-center cylindrical roof were optimized with the minimum peak negative pressure on roof surface and the minimum absolute value of vertical displacement as the optimization objectives.The results show that when R/S=1.26 andθ=45.8°,the peak negative pressure on the roof surface is lowest.When R/S=0.56 andθ=14.1°,the absolute value of vertical displacement of the roof under mean wind loads reaches the minimum value.