基于CFD与正交试验的偏转通风导流板优化研究

Optimization Study of Deflecting Ventilation based on CFD and Orthogonal Tests

本文以典型的办公室为例,采用竖直贴附射流加导流板送风模式(偏转通风),改变导流板的几何参数,进行三维数值模拟。利用正交试验设计方法研究导流板的长度,宽度和倾斜角度三个影响因素,得到不同情况下室内气流组织的流场和温度场分布特点。采用热感觉预测平均投票PMV,坐姿头脚温差,呼吸区平均空气龄,吹风感不满意率四个评价指标对室内热舒适及通风效果进行对比分析,最终得出较佳的导流板优化方案,可为偏转通风设计提供指导。

In this study,a typical office is taken as an example.The vertical attached jet with the deflector air supply mode are used by changing the geometric parameters of the deflector and using three-dimensional numerical simulation.The orthogonal test design method is used to study the deflector.The characteristics of flow field and temperature field distribution of indoor airflow under different combinations of the three influencing factors,including length,width and inclination angle.Four evaluation indexes,i.e.the Predicted Mean Vote(PMV),vertical air temperature between head and ankle levels,mean air age of the breathing area and the percentage of dissatisfied due to draft are adopted.Comparing and analyzing the indoor thermal comfort and ventilation efficiency,the better guide plate optimization scheme is finally obtained.