Two-dimensional high-speed particle image velocimetry was used to study horizontal-confronted twogroup-layered impinging turbulent flow fields. Flow structures of two sets of nozzles were analyzed under conditions of different Re

nozzle diameter

upper and lower radial jets. The velocity field was decomposed by POD to extract large scale energy-carrying structure. The results show that low-order intrinsic mode features a large-scale vortex structure with obvious vortex structures in flow field and energy of transient flow field mainly concentrates in the first-order mode. Flow characteristics of whole flow field is easily described such that modal reconstruction of pulsating field could accurately reestablish vortex structures in the flow field. Under condition of L=3d

asymmetric flow field energy was higher than that of symmetric flow filed

low order modal energy was increased with increasing nozzle Re

but was first increased then decreased with the increase of nozzle diameter. Under condition of 10 mm diameter

first order mode energy was the highest and vorticity was the maximum.