ANALYSIS ON ATOMIZATION CHARACTERISTICS OF FUEL SLINGER FROM TURBOJET ENGINE WP11

Fuel slingers are widely used in small-and medium-sized aero engine combustors and offer the advantages of lower fuel supply pressure, smaller axial size, and easier manufacturing. While fuel slinger atomization quality generally has no relationship with aircraft flight height, there is little research on the atomization characteristics of fuel slingers under various combustor conditions. In this paper, a phase Doppler particle analyzer (PDPA) and a high-speed camera were used to measure the spatial distribution of spray droplets in the external flow field of the WP11 engine slinger at different rotation speeds and flow rates. The results showed that the spray jets were uneven in the same circle holes. The air dynamic force and unsteady spray motion dominated the breakup process. In the axial direction, there was an M-shaped double peak spatial distribution of the atomized spray particles' Sauter mean diameters (SMD). The M-shaped distribution was not symmetrical because of the arrangement of the injection holes. The side with more injection holes had higher atomization quality, higher spray concentration, and lower SMD. In the radial direction, with the increase of the radius, the distance between the two SMD peaks widened, the SMD distribution curve was smoother, and the atomization uniformity was higher. SMD distributions were similar under different fuel slinger rotation speeds: increasing rotation speeds caused the distance between the two SMD peaks to be wider and average SMD to be smaller.