| Citation: | LIU Yan, HUI Xin, WANG Jianchen, et al. Effect of swirl number of pilot stage on ignition performance of centrally-staged combustor[J]. Journal of Aerospace Power, 2022, 37（10）：2335-2343 doi: 10.13224/j.cnki.jasp.20220277
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In order to investigate the influence of pilot stage swirl intensity on ignition performance, ignition tests using a centrally-staged combustor equipped with three different pilot stages with different inner/outer swirl numbers were carried out at atmospheric temperature and sub-and atmospheric pressures, and the ignition boundaries were obtained. The ignition test results showed that the ignition performance of inner weak swirl and outer strong swirl pilot stage had the best ignition performance, and increasing the inner swirl intensity was not conducive to ignition. The spatial distributions of the fuel spray at the outlet of the three configurations of pilot stage were measured by using the Mie scattering technology. The measurement results showed that increasing the inner swirl intensity can increase the spray angle, and reducing the outer swirl intensity can reduce the spray angle. The pilot stage with inner weak swirl and outer strong swirl led to proper fuel distribution near the central axis of the combustor and near the ignitor, thereby improving the ignition performance. The results are useful for improving ignition performance of centrally-staged combustors.
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