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为了从理论上对光击穿辐射声波进行定量描述,在点源模型的基础上提出了一种改进的水下光击穿声辐射计算方法,利用波动方程和水下爆炸理论求解单点击穿的辐射声波,并推导了多点击穿的辐射声波。从理论上对多点击穿的声压波形、声源级、传播特性和指向性进行了定量计算,并通过实验数据对比进行了验证。结果表明,计算与实验结果是一致的,证明了该方法的正确性和有效性;当激光能量从0.1J增大至0.8J时,声源级从182.4dB增至188.2dB;当激光能量高于0.3J时,声源级变化很小;在垂直等离子柱体的方向上声波辐射最强,在等离子柱体方向辐射最弱,所有方向上声波强度均与距离的平方成反比。
In order to quantitatively describe the light breakdown radiation sound wave theoretically, an improved method of underwater acoustic breakdown sound radiation calculation is proposed based on the point source model. The wave equation and underwater explosion theory are used to solve the single-point breakdown Radiates sound waves, and deduces the punctuated radiation sound waves. In theory, the sound pressure waveforms, sound source level, propagation characteristics and directivity of multi-point breakdown are quantitatively calculated and compared with the experimental data. The results show that the calculation is consistent with the experimental results, which proves the correctness and validity of the method. When the laser energy increases from 0.1J to 0.8J, the sound source level increases from 182.4dB to 188.2dB. When the laser energy is high At 0.3 J, the sound source level changed very little. The strongest radiation was in the direction of vertical plasma column and the weakest in the direction of plasma column. The acoustic intensity in all directions was inversely proportional to the square of the distance.