双层百叶风口数值模拟的速度分区模型

the Velocity Partition Model of Double Louver in Air Supply Opening CFD Simulation

在对室内流场进行数值模拟研究时,入流边界条件的描述直接影响室内气流结果的准确性。关于风口模型的描述有很多,但这些模型绝大部分没有体现实际风口出流速分布不均匀性对模拟结果准确性的影响。为了得到1个简单而又能满足实际工程需求的风口模型,本文根据实验测量的送风口风速,以风速分布为依据,建立速度分区风口模型。使用此模型对不同出流条件的方形和矩形双层百叶风口进行数值模拟,并与实验数据进行对比。结果表明,出流速度的不均匀性对长宽比较大的送风口有很大影响。证明了速度分区模型可以准确描述实际复杂风口空气射流特性,为未来进一步研究室内空气流动提供可靠的依据。

In the numerical simulation study of the indoor flow field,the description of inflow boundary conditions directly affects the accuracy of indoor airflow results.There are many descriptions of the air supply opening models.However,most of these models did not reflect the influence of the uneven distribution of the actual outlet velocity on the accuracy of the simulation results.In order to obtain a simple air supply opening model that can meet the actual engineering requirements,this paper established a velocity partition air supply opening model based on the measured air velocity at the air supply outlet and the velocity distribution.The model was then used to numerically simulate square and rectangular double louver with different discharge conditions,and compared with the experimental data.The results show that the uneven distribution of outlet velocity has a great influence on the opening with large aspect ratio.It thus proved that the velocity partition model can accurately describe the air jet characteristics in real complex opening and provide a reliable basis for further study of indoor airflow in the future.