Experiments and simulation of hydraulic jump of non-central impinging jet on rotating disk

doi:10.16085/j.issn.1000-6613.2020-2510

Abstract

Abstract:

The fluid flow in a rotating disk with a non-central impinging jet was studied. A rotating disk device with a high speed camera was designed to record the liquid film flow. Based on the VOF (volume of fluid) model, a gas-liquid two-phase flow model was established. Compared with the experimental results, the average relative error between the simulated and the experimental values was less than 9%, which demonstrated the accuracy of the CFD (computation fluid dynamics) model. Then, the influence of inlet flow rate and disk rotation speed on the hydraulic jump in the inlet area of rotating disk was studied by means of CFD. The results indicated that in front of the inlet rotation direction, the hydraulic jump radius will be larger when the inlet flow rate was larger and the disk rotation speed was smaller, and the hydraulic jump phenomenon will be more obvious. After the inlet rotation direction, the hydraulic jump radius will be larger when the inlet flow was larger. But the hydraulic jump radius increased first and then decreased with the increase of disk rotation speed. The relationship between the hydraulic jump radius behind the inlet rotation direction and the inlet flow rate and rotation speed was fitted. The empirical correlation was got. The relative error between the correlated and the simulated values was less than 15%.

Key words: non-central impinging jet, rotating disk, computational fluid dynamics, gas-liquid flow, hydrodynamics

摘要：

针对非中心入射流旋转圆盘，设计了利用高速摄像系统记录液膜流动的旋转圆盘装置，对圆盘表面的流体流动现象进行了研究。利用VOF（Volume of Fluid）多相流模型，建立了非中心入射流旋转圆盘进口区域气液两相流模型，并与实验测量结果进行对比，模拟值与实验值的平均相对误差为9%，证明了CFD模型的准确性。随后通过CFD方法分别研究了进口流量和圆盘旋转速度对非中心入射流旋转圆盘进口区域水跃现象的影响，结果表明在进口旋转方向前方，进口流量越大，圆盘旋转速度越小，水跃半径越大，水跃现象越明显；在进口旋转方向后方，进口流量越大，水跃半径越大，而随着圆盘旋转速度的增加，水跃半径先增大后减小。对进口旋转方向后方的水跃半径与进口流量和旋转速度的关系进行拟合，得到相关经验关联式，拟合值与模拟值的误差范围在15%以内。

关键词: 非中心入射, 旋转圆盘, 计算流体力学, 气液两相流, 流体动力学

CLC Number:

TQ021.1

REN Siyuan, LIU Chunjiang, GUO Kai, LIU Hui, XIANG Wenyu, XIE Chungang, LI Xue. Experiments and simulation of hydraulic jump of non-central impinging jet on rotating disk[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 6027-6034.

任思远, 刘春江, 郭凯, 刘辉, 项文雨, 谢春刚, 李雪. 非中心入射流旋转圆盘水跃现象的实验与模拟[J]. 化工进展, 2021, 40(11): 6027-6034.

Figures/Tables 15

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网格数量	水跃高度/mm	水跃半径/mm
486×10⁴	0.51	27.67
616×10⁴	0.49	28.18
759×10⁴	0.45	29.21
1089×10⁴	0.45	29.16

网格数量	水跃高度/mm	水跃半径/mm
486×10⁴	0.51	27.67
616×10⁴	0.49	28.18
759×10⁴	0.45	29.21
1089×10⁴	0.45	29.16

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