Numerical Simulation of External Flow Field Self-excited Oscillating Pulsed Cavitation Jet of Dual Chamber Nozzle
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摘要: 以单腔室自激振荡脉冲喷嘴为基础，采用串联方式建立双腔室自激振荡脉冲喷嘴，应用FLUENT软件对其外部流场进行数值模拟，分析入射压力、靶距、腔长比、腔径比的改变对外部流场的影响。结果表明：当入射压力在1.1 MPa~4.4 MPa间变化时，空化程度随着压力增大而减小，同时压力每增加一倍时，靶面处最大速度增长约20~76 m/s；当靶距在100 mm~400 mm范围内变化时，空化程度随靶距增大而增大，但当靶距达到400 mm时，会因靶距太远气泡在空中溃灭空化程度骤减；当腔长比为0.67时或腔径比为1.2时，腔室内的涡环结构对称性好，有利于脉冲和空化的产生；同时具有较高的动能，当腔长与腔径同时取最佳值时，脉冲性最佳具有较好的清洗效果。Abstract: In single-chamber self-oscillation pulse basis nozzle, a double-chamber self-excited oscillation pulse nozzle was established in series, The FLUENT software was used to simulate the external flow field, and the effects of changes in incident pressure, target distance, cavity length ratio and cavity diameter ratio on the external flow field were analyzed. The results show that when the incident pressure varies between 1.1 MPa and 4.4 MPa, the degree of cavitation decreases with the increase of pressure, and the maximum velocity at the target surface increases about 20~76 m/s every time the pressure is doubled; When the target distance varies from 100 mm to 400 mm, the degree of cavitation increases with the increase of the target distance. However, when the target distance reaches 400 mm, the degree of cavitation in the air collapses rapidly due to the target distance. When the cavity length ratio is 0.67 or the cavity diameter ratio is 1.2, the vortex ring structure in the chamber has good symmetry, which is beneficial to the generation of pulse and cavitation. At the same time, it has high kinetic energy. When the cavity length and the cavity diameter are taken its optimal values at the same time, the pulse quality is optimal and has a good cleaning effect.
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Key words:
- dual chamber /
- cavitation jets /
- numerical analysis /
- cavitation model /
- cavitation nozzle
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表 1 不同腔长腔径结构参数
mm 腔长 腔径 腔径 腔径 腔径 腔径 20 60 80 100 120 140 40 60 80 100 120 140 60 60 80 100 120 140 80 60 80 100 120 140 100 60 80 100 120 140 
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