并排塔器耦合流场特性研究

Research of Coupled Flow Field Characteristics of Parallel Towers

随着化工设备大参数化,并排塔器日渐增多,其设计一直是工程应用中亟待解决的问题。采用ANSYS CFX数值模拟,建立了3座并列排布塔器的计算模型,分别采用k-ε模型和大涡模型(LES)开展了三维稳态与瞬态流场数值模拟研究,分析了并排塔器的表面压力分布,升力系数、阻力系数以及斯托罗哈数等流场特性。研究结果表明,间距比为3≤S/D≤5时存在强耦合区;当S/D> 5时,流场的耦合作用减弱,各塔的振动特性趋近于单座塔器。处在流场中不同位置的塔器,其耦合作用强弱顺序为:中游塔器>下游塔器>上游塔器。在横风向振动中,下游塔器对上游塔器具有稳流作用;在顺风向振动中,上游塔器对下游塔器具有遮挡作用。

With the development of large-parameter chemical equipment,the number of parallel towers is increasing,the design of them has always been a difficult point that needs to solved urgently in engineering application.In this paper,ANSYS CFX numerical simulation was used to establish the calculation model of three towers in side-by-side arrangement.The numerical simulations of three-dimensional steady-state and transient flow fields were carried out using the k-ε model and the large eddy simulation (LES),respectively.A series of flow field characteristics,such as the pressure distribution of parallel towers,lift coefficient,drag coefficient and Strouhal number were analyzed.The research results show that there was a strong coupling region when the spacing ratio was 3≤S/D≤5 .When the spacing ratio was greater than 5,the coupling effect of the flow field was weakened,and the vibration characteristics of each tower approached to the characteristics of a single tower.The order of the coupling intensity of the towers at different positions in the flow field was as follows: middle tower>downstream tower>upstream tower.In the cross-wind vibration,downstream tower has a flow stabilizing effect on the upstream tower;And in the downwind vibration,the upstream tower has a blocking effect on the downstream tower.