The radiation acoustic field due to cavitation bubbles collapse near the rigid wall was studied. And the sound pressure distribution of the radiation field due to a single bubble and double bubbles near the rigid wall was obtained. This study shows that due to the impact of rigid wall the acoustic radiation of cavitation bubbles becomes some directional. The distribution of radiation pressure by double bubbles depends on the bubbles' collapse time, the distance between bubbles, and the initial radius of the cavitation bubbles. Considering the phase superposition of sound pressures, radiation pressure at the measurement points depends on sound pressure amplitude p of the bubbles, and the sound path difference of the twornbubbles to the observation point, Δ1 = l1/2sinθ1 and Δ2 = l2/sinθ2. This computation process and result may provide somernbasis for the cavitation calculation near the rigid wall, and a theoretical basis for radiation sound field analysis of multi-bubble cavitation. It is also helpful for improvement of kinematic equations of cavitation bubbles.%对空化泡在刚性壁面附近溃灭过程中的辐射声场进行研究,并得出刚性壁面附近单空泡、双空泡的辐射声压分布.研究表明由于刚性壁面的影响使得空化泡的辐射声场表现出一定的指向性.双空泡辐射声压分布还与空泡崩溃时间、空泡之间距离以及空化泡初始半径有关.在考虑到声压相位叠加时,待测点处的辐射声压依赖于空泡的声压幅值p和两空泡到观察点的声程差△1=l1/2sinθ1和△2=l2/2sinθ2.计算过程及结果为刚性壁面附近的空化计算提供依据,并为多泡空化的辐射声场分析提供理论依据,有助于修正空化泡的运动方程.
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