| Abstract:In order to investigate the effect of different fuel supply pressures on the fuel atomization field of centrifugal nozzles, the
atomization characteristics of a centrifugal nozzle under different working conditions were studied by combining the results of fuel nozzle
atomization experiments and numerical simulations of fuel atomization gas-liquid two-phase flow. The results show that the liquid
momentum ratio increases with the increase in fuel pressure. The spray cone angle is influenced by the supply pressure at low supply pres?
sure, and then by the nozzle structure, with the overall trend of first increasing and then decreasing. During the liquid filling process, a
central negative pressure zone is formed at the interface of the gas phase and liquid phase in the nozzle center, a large amount of air is
squeezed into the zone, resulting in the formation of an air vortex with conical tail inside the nozzle. In the upper chamber of the swirl
chamber and the inner side of the downstream region of the spray cone, multiple small vortex structures appear due to the shear force of air
and liquid, these vortex structures are related to fuel supply pressure. When the supply pressure is 0.4 MPa, the Weber number is low, and
on the liquid film surface, a surface wave is generated that varies sinusoidally along the liquid film surface. When the supply pressure is 2.7
MPa, the Weber number is high and the liquid columnar fragmentation is dominated by Rayleigh-Taylor (R-T) instability. |
