温室周围空气绕流的仿真分析

Simulation Analysis of Air Baffling Flow of Greenhouse

温室周围存在着较为复杂的绕流风场,其表面的风压分布是温室设计与优化的依据。为了解温室外表面风压的分布规律,建立了有无遮阳幕两种工况下二维的温室物理模型,并通过Fluent流体动力学软件进行了数值模拟计算。结果表明,当温室设置外遮阳幕时,周围的风场变得异常复杂;在温室表面的同一位置,两种工况下的风压值与风吸值存在着很大的差别。经比较,温室在有遮阳幕的情况下受风的作用力要比无遮阳幕时的大。因而在设计有外遮阳幕温室的过程中,取传统的风压体型系数不一定能保证温室的可靠度与稳定性。

Around the greenhouse exists the complex wind field of circumferential flow, the distribution of its superficial wind pressure is the basis of greenhouse design and optimization. In order to understand the distributing rule of the wind pressure of the greenhouse outside surface , the two - dimensional greenhouse physical models under two operating modes（ with or without visor curtain）are established and the computation of numerical simulation is carried out by using the hydrodynamics software - Fluent. The result showes when outside the greenhouse there is visor curtain, the wind fields around become more complicated. In the same location of greenhouse surface - under two kinds of operating modes, between the wind pressure and wind inhale value there is a considerable difference. When the greenhouse has visor curtain , the wind force acting on it will be bigger. Thus, for designing a greenhouse which has visor curtain , the traditional wind pressure coefficient does not necessarily guarantee the reliability and stability of the greenhouse.