半疏水-半亲水球体垂直入水空泡数值仿真研究

发布时间：2018-10-21 12:04

【摘要】：采用流体体积多相流模型耦合连续表面力模型,对具有非对称表面润湿性的半疏水-半亲水球体垂直入水空泡形态发展过程进行数值仿真,分析了半疏水-半亲水球体垂直入水过程中受到的流体动力。研究结果表明:半疏水-半亲水球体垂直入水后,产生非对称入水空泡及"心"型喷溅,同时球体运动轨迹将偏离原竖直运动轨道,由疏水半球一侧向亲水半球一侧偏斜;入水初期,在球体表面形成液体薄层运动,在疏水半球一侧,液体薄层与球体表面分离,导致空气进入形成敞开空泡;在亲水半球体一侧,液体薄层沿球体表面向上运动最终在球体顶点汇聚;液体薄层汇聚后形成楔形流,楔形流在球体顶点与球体表面分离,继续向疏水半球一侧产生的入水空泡壁面运动并撞击,形成"心"型喷溅。
[Abstract]:Using the fluid volume multiphase flow model coupled with the continuous surface force model, the development process of a semi-hydrophobic and semi-hydrophilic sphere with asymmetric surface wettability is numerically simulated. The hydrodynamic forces of semi-hydrophobic and semi-hydrophilic spheres during vertical entry are analyzed. The results show that when the semi-hydrophobic and semi-hydrophilic spheres are perpendicular to the water, asymmetric cavitation bubbles and "center" spatter are produced, and the trajectory of the sphere will deviate from the original vertical motion track from the hydrophobic hemisphere to the hydrophilic hemisphere. In the initial stage of water entry, the liquid thin layer moves on the surface of the sphere. On the hydrophobic side, the liquid thin layer is separated from the sphere surface, resulting in the air entering and forming an open void; on the hydrophilic side of the hemispherical body, The liquid thin layer moves upward along the surface of the sphere and eventually converges at the top of the sphere; after the liquid thin layer converges, the wedge flow forms a wedge flow, which separates from the surface of the sphere at the top of the sphere and continues to move and impinge on the wall of the hollow bubble generated by the hydrophobic hemispheric side. Form "heart" spatter.
【作者单位】：哈尔滨工业大学航天学院;
【基金】：国家自然科学基金项目(11672094) 哈尔滨市科技创新人才专项基金项目(2013RFLXJ007)
【分类号】：O35

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