| Citation: | HE Haoji, ZHANG Tongyu, GUO Zhihui. Primary breakup characteristics of liquid jets in non-uniform flow[J]. Journal of Aerospace Power, 2025, 40（6）：20240111 doi: 10.13224/j.cnki.jasp.20240111
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Experiments were conducted to investigate the primary breakup characteristics of liquid jets injected into a crossflow with linear distribution of incoming velocity. Jet breakup modes, column breakup point, jet surface wave and surface velocity were extracted and analyzed by high-speed camera combined with backlighting method, and the deformation and penetration laws of the jet were described. Experiments were conducted on five structures at atmospheric pressure and 320 K environment with selection of average momentum ratio 20—80 and gas Weber number 5.6—40. The results showed that the positive gradient delayed the breakup modes and the negative gradient advanced it; when the incoming flow was non-uniform, the jet deformation, penetration, and surface wave became complicated, which also delayed or advanced the location of the column breakup point. Phenomenological analysis can effectively explain and correlate the measurements of the primary breakup characteristics of liquid jets with non-uniform incoming flow, and the predictive expressions for jet deformation and column breakup height adapted to the conditions of this experiment were presented.
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