应用粒子图像测速技术研究散流器的气流流场
Investigation on characteristics and structures of flow field near a diffuser with PIV
摘要：
为了得到舱体内气流组织数值模拟所需的边界条件，采用粒子图像测速(PIV)技术对某型散流器的气流流场进行了测定，得到了10个断面上的时均速度场，使用速度矢量合成得到了相交点上的25个三维速度矢量，并对流场的特点进行了分析。结果表明，轴流风机形成的流场经过散流器后向四周分散的趋势更加明显，并且出现了气流的分叉，这些特点在以散流器为边界进行数值模拟时尤其值得注意。
Abstract：
Experimentally investigates the characteristics and structures of flow field near the diffuser with particle image velocimetry (PIV) measurement technique in order to obtain the boundary condition for numerical simulation on air distribution in cabins. Obtains the time averaged velocity fields on ten sections and 25 three-dimensional velocity vectors of intersections. Discusses the properties of the flow field. The results show that airflow diffusion becomes wider and divarication turns up when the airflow generated by axial flow fan passes through the diffuser, which should be paid more attention while the diffuser is used as boundary condition for numerical simulation.
Keywords:particle image velocimetry (PIV), diffuser, flow field measurement, airflow velocity