双圆柱体低速并联入水过程空泡及运动特性试验研究

Tests for cavities and motion characteristics in process of two-cylinder in parallel water entry at low speed

为深入了解双圆柱体低速并联入水过程空泡演化及运动规律,基于高速摄像方法,开展了圆柱体低速并联入水试验研究。通过圆柱体单独入水和双圆柱体并联入水试验对比,分析了并联入水双空泡演化机理;进一步开展了不同入水速度试验,研究了入水速度对并联入水过程圆柱体运动特性的影响,并结合空泡演化规律,分析了空泡演化过程对圆柱体运动的影响机理。研究结果表明:圆柱体低速并联入水过程中,入水空泡呈现明显不对称特性;在非对称流体动力作用下,圆柱体产生了偏转与横向运动,且偏转运动受空泡闭合影响较大;两圆柱体运动特性曲线与双空泡形态呈现良好的对称性。

To deeply study cavities evolution and motion laws in process of two-cylinder in parallel water-entry at low speed, tests for two-cylinder in parallel water-entry at low speed were conducted. The evolution mechanism of in parallel water-entry two-cavity was analyzed by comparing tests for a single cylinder water entry and those for two-cylinder in parallel water entry. The tests with different water-entry velocities were conducted to study the effects of water-entry velocity on cylinders’ motion characteristics in process of them in parallel water-entry. Combined with the evolution law of cavities, the influence mechanism of cavities evolution process on cylinders’ motion was analyzed. The results showed that in process of two-cylinder in parallel water-entry at low speed, cavities have obvious asymmetry;cylinders have lateral motion and excursion one under the asymmetric hydrodynamic action;cavities closure affects cylinders’ excursion motion obviously, the motion characteristic curves of two-cylinder and two-cavity morphology have a good symmetry.