振动耦合效应下水力旋流器油水两相流动研究

Study on Oil-water Two Phase Flow in the Hydrocyclone under Vibration Coupling Effect

针对水力旋流器结构振动及振动条件下流场流动规律的研究较少。鉴于此,以典型双锥结构的水力旋流器为研究对象,对流体域控制方程进行离散,开展了振动耦合条件下水力旋流器油水两相流动的数值模拟研究,并与非耦合条件下流场进行了对比分析。研究结果表明:振动耦合效应使得切向速度沿流动方向逐渐衰减,且出现了激振方向与非激振方向流场不对称的特点;轴向速度受激振力影响较小,在激振位置之后耦合与非耦合条件下的径向速度差异逐渐增大;受激振力的影响,振动耦合条件下的油相滑移速度在近壁侧增大,但水力旋流器的分离效率低于非耦合条件下的分离效率。研究结果可为旋流器的设计和应用提供理论依据。

Considering that few studies has been focused on the structure vibration of hydrocyclone and the flow field characteristic under vibration conditions, by taking the typical double cone type hydrocyclone as the re-search object, the numerical simulation of oil-water two-phase flow in hydrocyclone under the condition of vibration coupling has been conducted through discrete of the control equations of the fluid domain. The results were then compared with the non-coupling flow field. The analysis shows that the vibration coupling effect makes the tangential velocity gradually decrease along the flow direction. The asymmetry characteristic of flow field along the excitation direction and the non-excitation direction has been observed. The axial velocity is less affected by the exciting force. The difference of radial velocity increases under coupling/non-coupling behind the excitation position. Under the effect of the exciting force, the oil phase slip velocity on the near-wall side increases under the vibration coupling condition, but the separation efficiency is lower than that under non-coupling condition. The study results could pro-vide theoretical basis for the design and application of hydrocyclone.