Abstract:

In order to reveal the characteristics of radial and vertical jets in the opposite wall jet, renormalization group k-ε model is adopted to simulate complex three-dimensional opposed jet. The partition structure and expansion rate of radial and vertical jets are analyzed.The influences of initial Reynolds number and nozzle distance on jet expansion rate are discussed.The results show that radial jet and vertical jet have similar regional division, however, vortices in different directions formed in the flow field have different influence ranges. The initial Reynolds number has no obvious effect on the expansion rate of the radial jet. The nozzle distance has a significant effect on the expansion rates of radial and vertical jets. The larger the nozzle distance is, the larger the expansion rates of the radial and vertical jets are. Meanwhile, the nozzle distance has a certain influence on the jet development. Near nozzle spacing shortens the time for jet to reach the maximum velocity point, and speeds up the development process.

Key words: opposed jet, wall jet, jet region division, jet expansion