The fluctuation

velocity distribution and spread rate of the radial jet from two opposed nozzles at L/D＝0.5—100 were experimentally investigated and numerically simulated

whereL is the length of two nozzles separation and D is the nozzle diameter.Results show that the turbulence intensity of the radial jet is obviously higher than that of free jet.The velocity of the radial jet increases to a maximum from the stagnation point then decays and exhibits a selfsimilarity.With the increase of the nozzle separation

the spread rate of the radial jet increases

and is about 1.5—3 times as that of free round jet.The velocity distributions of the radial jet from two opposed nozzles were numerically simulated by CFD.Compared to experimental results

the spread rate is obviously underpredicted by two-equation turbulence models

and the prediction by Reynolds stress model (RSM) is improved..