Aiming to enhance self-excited oscillating cavitation jet performance, the effect of the dual-chamber nozzle structure on the jet dynamical characteristics was designed and investigated. With high-speed camera technology, the cavitation phenomenon was investigated to analyze the area pattern and shedding period of the cavitation cloud under different nozzle structures. The results showed that the dual-chamber nozzle significantly improved the jet cavitation strength, and the cavitation cloud area increased by 76% and decreased the shedding period by 90% compared with the single-chamber nozzle. In the upstream chamber, the upper shrinkage ratio had a more drastic effect on the cavitation cloud area and shedding frequency than the lower shrinkage ratio with a more sensitive effect on the shedding frequency. In the downstream chamber, the outlet diameter ratio and chamber diameter were more sensitive to the regulation of cavitation cloud shedding frequency and area, respectively, with the optimal regulation at the outlet diameter ratio of 1 and chamber length of 6 mm. The chamber diameter modulated the cavitation cloud most drastically with a comprehensive performance optimum at 12mm, which the area fluctuation reached 76.8%. The results provide a basis for further research and application of dual-chamber nozzles.
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