浙江大学 工程力学系,杭州,310027
张凌新(1978-), 男, 江苏南通人, 副教授, 研究方向:空化流及气泡动力学, .E-mail:zhanglingxin@zju.edu.cn
邵雪明(1972-), 男, 浙江人, 教授, 研究方向:多相流及水动力学.E-mail:mecsxm@zju.edu.cn
纸质出版:2020
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张凌新, 张靖, 邵雪明. 空泡溃灭过程中的压力波能分析[J]. 空气动力学学报, 2020, 38(4): 807-813.
ZHANG Lingxin, ZHANG Jing, SHAO Xueming. The analysis of pressure wave energy during the collapse of the cavitation bubble[J]. 2020, 38(4): 807-813.
张凌新, 张靖, 邵雪明. 空泡溃灭过程中的压力波能分析[J]. 空气动力学学报, 2020, 38(4): 807-813. DOI: 10.7638/kqdlxxb-2020.0039.
ZHANG Lingxin, ZHANG Jing, SHAO Xueming. The analysis of pressure wave energy during the collapse of the cavitation bubble[J]. 2020, 38(4): 807-813. DOI: 10.7638/kqdlxxb-2020.0039.
本文对单泡以及多泡的溃灭过程进行了数值研究,重点分析了其中的能量传递机制。考虑流体介质的黏性、表面张力以及压缩性,建立了模拟空泡运动的两相流控制方程。首先对单泡溃灭过程进行了数值模拟和验证,随后分析了单泡溃灭过程中的能量变化,发现能量首先从空泡势能传递到流场动能,再从流场动能传递到压力波能。在多泡溃灭过程中,发现泡泡间存在强烈的相互作用。外层空泡运动快于内层空泡,能量逐渐聚集在中心泡上,导致中心泡溃灭辐射的压力波能要远高于单泡。无论是单泡还是立方体布置的多泡,随着近壁距离的减小,释放的压力波能逐渐降低。在无量纲近壁距离
γ
=1.5下,波能转化率约为10%的量级。
The collapses of both a single cavitation bubble and multiple bubbles are investigated numerically
with special emphasis on the conversions between different forms of energies. The governing equations of the bubble flow are established by considering the viscosities
the surface tension force and the compressibilities of the two fluids. First
the collapse motions of a single bubble is simulated and also validated. We subsequently analyze the evolution of the energies during the collapse and find that the energy transfers from the potential energy to the kinetic energy
then to the pressure wave energy. Strong interactions between bubbles are found during the collapse of the multiple bubbles. The motion of the outer bub
bles is obviously faster than the inner bubbles. Due to the energy contribution of the outer bubbles
the collapse of the central bubble leads to a release of high-value wave energy when compared to the collapse of the single bubble. Both for a single bubble and for cube-distributed multiple bubbles
the released pressure wave energy decreases when the stand-off distance is reduced. The conversion rate of wave energy is about 10% at the dimensionless distance of
γ
=1.5.
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