基于POD方法的圆型喷口射流速度场结构分析

大空间建筑中分层空调系统喷口送风射流运动卷吸会造成热量自上部非空调区向下部空调区转移,这是导致空调系统负荷增加的原因之一。本文搭建圆型喷口射流运动盐水模型实验台,利用粒子速度测量系统(PIV)提取喷口卷吸剪切层附近流场速度矢量场信息,借助特征正交分解方法(POD)剖析剪切层内的相干结构及其能量分布、竖向与横向速度特征值比例,为后期研究喷口卷吸运动引起的大空间对流转移热量提供实验与理论参考。

Structure analysis in circular jet shear layer velocity field based on POD method

The air jet entrainment of stratified air conditioning system in large space building can cause the transfer of heat from the upper part of conditioned area to the lower part of non air conditioning area, which is one of the reasons leading to the increased load of air conditioning system. The article built the platform of saline model experiment of circular jet movement,and used the particle velocity measurement system (PIV) to extract information of nozzle flow field near the shear layer entrainment velocity vector field.With the help of proper orthogonal decomposition method (POD), it analyzed the coherent structures and energy distribution, vertical and horizontal velocity characteristic value proportion in the shear layer. The system can provide experimental and theoretical reference for the later research of transfer heat in large space caused by jet entrainment.