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为改进在势流假设下获得的伪湍动表达式,该文在考虑液体粘性的基础上,简化匀速粘性液体绕球体的速度场,运用单元系综平均方法对流场进行处理,得到球形气泡在匀速粘性液体中引起的伪湍动关系式。该关系式表明伪湍动与空泡率成正比,并随颗粒R eyno lds数的增大而趋近势流结果。数据对比结果表明:在低空泡率、中等颗粒R eyno lds数的条件下,该表达式能比势流模型更准确地描述球型气泡在匀速粘性液体中引起的伪湍动。
In order to improve the pseudo-turbulent expression obtained under the potential flow hypothesis, this paper simplifies the velocity field of the uniform viscous liquid around the sphere based on the viscosity of the liquid and processes the flow field using the unit ensemble averaging method to obtain the spherical bubble Pseudo - turbulence induced in uniform viscous liquids. The relationship shows that pseudo-turbulence is directly proportional to the void ratio and tends to flow as the number of Reynolds particles increases. The data comparison results show that under the condition of low void fraction and medium particle Reynolds number, the expression can describe the pseudo-turbulence caused by spherical bubbles in uniform viscous liquid more accurately than the potential flow model.