关键词:

两喷嘴对置撞击流, 径向射流, 扩展率, 热线风速仪

Abstract: 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..

Key words:

两喷嘴对置撞击流, 径向射流, 扩展率, 热线风速仪