基于数值模拟方法的自然通风器风载体型系数研究  

A Study of Wind Pressure Coefficients of a Natural Ventilator based on Numerical Simulation

作　　者：张彩成[1] 王国砚[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《力学季刊》2013年第1期125-132,共8页Chinese Quarterly of Mechanics

摘　　要：基于Fluent软件平台,采用混合网格划分,选用Realizable k-ε湍流模型,对某自然通风器的风场进行三维数值模拟研究。选择0°、45°、90°、135°和180°等风向,每个风向考虑39m/s风速,此外对0°、180°两风向还考虑了57m/s风速。通过模拟,得到了主通风器导流片的风载体型系数。经计算,0°,180°两个风向的风场对导流片抗风影响较大,基于此对这两个风向的计算结果进行了详细分析。在数值模拟过程中引入多孔介质阶跃模型模拟次通风器导流片,在降低模型复杂程度和减少计算量的同时,保证了数值模拟结果的可靠性。分析表明,基于数值模拟方法得到的风载体型系数在不同风向和风速的情况下呈现一定的变化规律性,为确定自然通风器类结构的风载体型系数提供了合理依据。A 3D numerical simulation of wind field around a natural ventilator was conducted on the plat- form of Fluent. Wind velocity of 39m/s was considered in wind directions of 0° ,45° ,90° ,135°and 180 ; Be- sides, the wind speed of 57m/s was considered in wind direction of 0° and 180°. The results show that wind fields have greater influences on the wind pressure distribution of deflectors in the wind directions of 0° and 180°. Therefore, the results in these two directions were analyzed in detail. Turbulence model of Realizable k-e was used and hybrid mesh scheme was adopted. Wind pressure coefficients of every deflec- tor are calculated for the prototype ventilator. Porous jump boundary conditions were used to model the deflectors of other ventilators. In this way, the reliability of the results was ensured while greatly reduc- ing the complexity of the model and the amount of computer memory needed. The results show that the wind pressure coefficients obtained change with certain regularities in different wind directions and wind velocities. Reasonable references for determining wind pressure coefficients of such natural ventilators were provided.

关 键 词：自然通风器 风载体型系数 数值模拟 多孔介质阶跃 

分 类 号：TU834.53[建筑科学—供热、供燃气、通风及空调工程] TU312.1