Abstract

利用新提出的Gilmore-NASG模型,在考虑液体可压缩效应的边界条件下,研究了可压缩液体中气泡的声空化特性,并与用原有KM-VdW模型计算得到的结果进行了比较。结果表明,相比于KM-VdW模型,由于Gilmore-NASG模型中采用新的状态方程来描述气体、液体以及由可压缩性引起的液体密度变化及声速变化,所以用Gilmore-NASG模型得到的空化气泡的压缩比更大、崩溃深度更深、温度和压力峰值更高。随着驱动声压幅值的增大,两种模型给出的结果差别愈加明显,而随着驱动频率的增大,两种模型给出的结果差别逐渐减小。这表明,在充分考虑泡内气体、周围液体在不同温度和压强下共体积的变化所导致的介质可压缩特性下,气泡内的温度和压强可能达到更高值。同时,Gilmore-NASG模型还预测出了气泡壁处液体的密度变化、压力变化、温度变化以及液体中的声速变化。因此,Gilmore-NASG模型对于高压状态下气泡空化特性的研究以及周围液体对气泡空化特性的影响研究方面具有优点。

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