| Citation: | CHENG Zeyu, XIE Yu, GUO Zhihui. Experimental study on primary atomization characteristics of double swirl air-blast atomizer in near field region[J]. Journal of Aerospace Power, 2025, 40（7）：20230306 doi: 10.13224/j.cnki.jasp.20230306
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By using backlight high-speed shadowgraphy and liquid film tracking and recognition program, a full time series experimental study was conducted on the instability and breakup process of the liquid film at the exit of a double swirl air-blast atomizer. Based on the phenomenological description, the process of liquid film breakup was analyzed. The characteristics of liquid film deflection, circumferential rotation, radial flapping and spinning under swirling flow were summarized. Based on the time evolution characteristics of liquid structure during the breakup process, three typical breakup modes of liquid film under double swirl airflow were acquired as follow: sheet-bag breakup, ligament breakup, and hybrid breakup modes. By analyzing experimental statistical data and high-speed images, it was found that the average length of the ligaments was significantly affected by operating conditions. The impact of airflow pressure drop was greater than that of liquid flow rate. In addition, the empirical formulas between it and liquid Weber number and liquid Reynolds number were fitted through experimental data. A length deviation of film accumulation deviation was used to measure the probability of the occurrence of breakup modes. It was found that deviation was significant affected by airflow pressure drop and showed a decreasing tendency as airflow pressure drop increased. This indicated that airflow pressure drop dominated the change of liquid film breakup, while liquid flow rate had a less impact on deviation and did not affect the breakup modes.
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