Numerical simulation of surface cleaning flow field for gas-liquid two-phase jet

被引：0

作者：

Shi F. ^{[1
]}

Zhao J. ^{[2
]}

Sun X. ^{[3
]}

Yin H. ^{[2
]}

机构：

[1] College of Oil and Gas Engineering, Shengli College China University of Petroleum, Dongying

[2] Dongying Academy of Science and Technology, China University of Petroleum (China East), Dongying

[3] Petrochina Coalbed Methane Company Limited Xinzhou Company, Taiyuan

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 03期

关键词：

Computational fluid dynamics; Gas-liquid two-phase jet; Jet parameters; Numerical simulation; Surface cleaning;

D O I：

10.11817/j.issn.1672-7207.2021.03.027

中图分类号：

学科分类号：

摘要：

In order to study the saving and efficient cleaning technology of oil pipe surface, a three-dimensional physical model of gas-liquid two-phase jet cleaning was established with fluent software based on the computational fluid dynamics method. Velocity and pressure characteristics of the flow field with gas-liquid two-phase jet were simulated. The influence of jet parameters such as nozzle taper, gas volume fraction, jet velocity and spray distance on cleaning effect was analyzed. The results show that the velocity of gas-liquid two-phase jet is 14.2% higher than that of waterjet when the gas volume fraction is 7.4% and the jet velocity of nozzle is 265 m/s. In particular, the jet velocity can increase by 221% when the bubbles pass through the nozzle. The jet velocity increases rapidly to the maximum value and the shape of "constant velocity core" appears when gas-liquid two-phase jet passes through the nozzle. The jet velocity gradually decreases with the increase of distance from constant velocity core. After the two-phase jet is ejected from the nozzle, the jet pressure decreases gradually and pressure energy is gradually converted into kinetic energy. Pressure gradually increases in the form of a sphere at the position of about 1/7 jet distance from the wall. Pressure reaches the maximum at the stagnation point of the wall. With the increase of nozzle contraction section taper, the jet maximum velocity gradually increases. As the taper has the value of 3.5, the length of constant velocity core is the longest. As the gas volume fraction increases, the jet velocity increases gradually. While the gas volume fraction is bigger than 7.4%, the length of constant velocity core remains the same. With the jet velocity increasing, the maximum velocity and the length of constant velocity core increase continuously. Therefore, the impact energy of jet is higher. When spray distance increases, pressure of jet impacting on the wall decreases gradually. The impact effect is better when spray distance is lower than 5 times the nozzle diameter. The cleaning area of gas-liquid two-phase jet is 24.7% higher than that of water jet. Gas-liquid two-phase jet has higher cleaning efficiency. © 2021, Central South University Press. All right reserved.

引用

页码：960 / 970

页数：10

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