| Citation: | DUAN Zhengliang, GUI Tao, FANG Renlin, et al. Characteristics of fuel spray field in central staged combustor at idle condition[J]. Journal of Aerospace Power, 2023, 38（2）：298-311 doi: 10.13224/j.cnki.jasp.20210199
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In order to obtain the characteristics of spray field of main stage nozzle and pilot nozzle of central staged combustor at idle condition, the particle image velocimetry (PIV) was used to measure the spray field of single-tube combustion chamber with different head schemes and different nozzle fuel ratios. And the post-processing software of spray field image was developed, the spatial distribution of the spray field was obtained by extracting oil droplets on raw pictures in the central graded combustion chamber. The research of spray field under idle condition indicated that: large-size droplets were distributed in a conical shape in the fuel-rich head area of the combustion chamber, while the Sauter mean diameter (SMD) was distributed in a V-shaped radial direction, namely, small in the middle and large on both sides. The reduction of the expansion angle of the baffle made the number of droplets concentrated in the fuel-rich head area of the combustion chamber and the average SMD was larger. When the incoming flow conditions and the fuel-air ratio were kept constant, changing the fuel ratio had little effect on the atomization effect. The particle size with the largest number of droplets in the spray field under idle conditions was 25 μm, and the particle size range with the largest volume ratio was 30−50 μm.
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