Based on physics model and some suitable hypothesizes, the three dimensions mathematical models for micro-expanded tangent channel and swirling chamber are presented, and then the net columns of cross uniform and the SIMPLE method are used. In the end, the various numerical tests are carried out in order to investigate the flow characteristics and atomized performance of this nozzle at low pressure. The results are analyzed and shown: the angle θof the micro-expanded tangent channel plays an important role for the flow characteristics, if θ< 0, the circumfluence at the exit of the nozzle is obviously, and the θ> 0, the solid cone in nozzle are formed easily, but its energy loss is bigger. While the initial pressure po = 0.3 MPa, Ux,o = 0, Uy,o=0, Uz,o=-0.2 m/s, the circumfluence at the exit of the nozzle isn't exactly formed with θ= 5.8°.
Journal of Engineering Thermophysics