房间自然通风运用多区域网络模型的修正

多区域网络模型计算中采用简化假设,忽略隔门位置对通风量的影响,实际运用中对通风量计算误差较大。通过风洞实验,对不同开口率工况下进行隔门位于中间和侧边时通过模型的流量进行对比;对模拟与实验进行验证后,进行数值模拟拓展,分别分析没有隔门、前隔门、后隔门、前后隔门均在时,隔门偏移量对通过模型流量的影响。结果表明,当来流风速一定时,只要当开口率足够小时能忽略来流空气动量的影响;否则,需要类比为射流模型,通过计算最大射流长度确定影响情况并进行修正。

Correction method of multizone airflow model in matural ventilation room

Multi-zone airflow modeling uses some simplifying assumption which ignores the influence of airflow rate by different door position.And it would lead to large error in airflow rate calculation.This paper compares airflow rate through the models with door position in the middle and at the sides in different window opening ratio conditions by wind tunnel experiment.After comparing simulation model result with experimental model result,the numerical simulation is researched in different conditions:no door、front door、back door、front and back doors.The airflow rate through the models with different doors position is compared.Experimental results show that the effects of airflow momentum can't be ignored but only the window opening ratio small enough,or the free space jet or confined space jet models need to be compared,and the largest jet length is used to optimize multi-zone airflow model's results.