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含气泡液体中的非线性声传播
Propagation of nonlinear waves in the bubbly liquids
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摘要: 考虑到分布在液体中的气泡是声波在含气泡液体中传播时引起非线性的一个很重要的因素，本文研究了声波在含气泡液体中的非线性传播。将气体含量的影响引入到声波在液体中传播的方程中，从而得到声波在气液混合物中传播的数学模型。通过对该模型进行数值模拟发现，气体含量、驱动声场声压幅值及驱动声场作用时间均会影响到气液混合物中的声场分布及声压幅值大小。液体中的气泡会“阻滞”液体中声场的传播并将能量“聚集”在声源附近。对于连续大功率的驱动声场来说，液体中的气泡会“阻滞”气液混合物中声场及其能量的传播。Abstract: An important factor that causes the nonlinearity in the bubbly liquids when the acoustic wave is propagating is the bubbles. So we study the nonlinear propagation of acoustic waves in the bubbly liquids. The influence of the gas content is introduced into the equation of the wave propagation in the liquid, so one can get the model of wave propagation in the bubbly liquids. Through numerical simulation of the model one can get the gas content, the pressure amplitude of driving sound and the acting time of the driving sound can all affect the distribution of the sound field and the pressure amplitude of the wave in the bubbly liquids. The bubbles in the liquid will“block”the acoustic wave to propagate and“gather”the energy near the sound source field. For continuous and high power driving sound, the bubbles in the liquid will“block”the wave propagation and the transmission of energy.
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