Experimental and numerical study of jet mixing enhancement with wedged nozzle

Experimental flow field measurement of the circular and various wedged turbulent jets has been carried out.Simultaneously,standard k-ε model has been employed in the numerical simulation of the mean flow fields of various turbulent jets corresponding to the measured values.Comparison research has been performed to analyze the fragmentation and enhanced mixing effect of the nozzles with different number of wedge on the multi-scaled turbulent eddy structures in the free jet flow.The experimental and numerical results show that the energy distribution of wedged jets in space is different from that of the circular jet with the energy at the center being transported sidewise.Furthermore,due to the wedges not only the eddy structures at the wedge tines in the near field are broken up,but also the interactions such as eddy structures rejoining and entrainment take place at different locations normal to the flow along the longitudinal development of the jets.