Analysis of transient flow field characteristics of large-scale hydrodynamic coupling under speed regulation

被引：0
|
作者：
Lu X.-Q. [1 ]
Hu C.-Y. [1 ]
Chai Y.-L. [1 ]
Ma W.-X. [1 ]
Zhang J.-N. [1 ]
机构：
[1] School of Mechanical and Aerospace Engineering, Jilin University, Changchun
来源：
Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) | 2019年 / 49卷 / 05期
关键词：
Fluid transmission and control; Gas-liquid two phase flow; Hybrid reynolds average navier-stokes/large eddy simulation; Transient flow field; User defined functions;
D O I：
10.13229/j.cnki.jdxbgxb20180151
中图分类号：
学科分类号：
摘要：
In order to study the mechanism of internal flow of large-scale hydrodynamic coupling under dynamic speed regulation, the dynamic speed regulation process is defined by UDF program in this paper, and a numerical method for calculating the transient gas-liquid two phase flow with a large-scale hydrodynamic coupling is established. The dynamic circulation flow of gas-liquid two phase fluid between the pump and the turbine wheel is produced, and the gas-liquid two phase distribution state is obtained. The results show that with a smaller slip ratio at the initial stage of speed regulation with the shielding effect of high energy fluid in the vane free region, the torque coefficient is significantly reduced. With the decrease in speed ratio, the turbulent kinetic energy increases gradually, and the turbulent intensity of the pump impeller is much larger than that of the turbine. In the inlet of the pump wheel, the turbulent kinetic energy has an extreme value, and the phenomenon is especially evident in the braking condition. The PIV test shows that the numerical simulation results are in good agreement with the test. The work of this paper provides the necessary theoretical basis for optimizing the transient performance under the dynamic speed regulation mode of the large-scale hydrodynamic coupling. © 2019, Jilin University Press. All right reserved.
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页码：1539 / 1546
页数：7
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