Investigation on characteristics and structures of flow field near a diffuser with PIV

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.