非对称头型对航行器入水空泡及弹道特性影响的实验研究

The asymmetric head type can help the air-injected aircraft to quickly reach the horizontal navigation state, and has a good application scenario in practice. In this paper, the high-speed photography method is adopted to reveal that under the different impact speeds of the asymmetric head type at 5-12 m/s and the different impact angles at 60°, 70°, 80° and 90° by carrying out the water impact test of the aircraft with different configurations, the evolution mechanism of the water-entry cavity and the variation characteristics of the water-entry trajectory. Through the digital image recognition technology, the variation of the in-water trajectory and the attitude angle of the model is extracted to study the evolution law of the water-entry trajectory. The results show that the chamfered head shape causes the model head to be subjected to the lateral deflection force of the fluid, which causes the model trajectory to deflect. As the water-entry velocity increases, the trajectory deflection amplitude with the asymmetric head model increases too. Under different experimental conditions, the attitude angle of the aircraft follows the parabola variation law with time; the aircraft with asymmetric head shape will form a larger bubble opening when entering the water, and produce asymmetric water-entry cavity. The various asymmetry of the chamfered head is different in the stability of the water-entry cavity. The smaller the angle of cut, the worse the stability of the water-entry cavity, and the bubble is more likely to collapse.