Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure,Energy Science & Engineering

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Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2022-10-23 , DOI: 10.1002/ese3.1325
Liang Zhang ₁ , Qingjie Qi ₁ , Tianfang Ma ₁ , Lifeng Sun ₁ , Yue Wang ₁ , Jiamei Chai ₁

Affiliation

A water jet with an air ring protective layer is a promising rock-breaking and cutting rate improvement method in submerged environment, such as oil–gas drilling. The jet flow field characteristic determines the jet impinge performance and is affected by nozzle structure parameters. In this study, the water jet flow with air ring under submerged environment was numerically simulated. The jet flow field structure with air ring was obtained by analyzing the distributions of jet velocity and air content at different cross sections. The effects of several critical nozzle structure parameters on jet isokinetic core length and axial velocity were investigated by adopting the orthogonal design method. The results show that the jet flow field structure with air ring in radial direction includes a high-speed water jet zone, air ring protective layer, and air–water mixed zone, having the advantages of concentrated energy in axis region, long core section length, and low-velocity attenuation. The influence degrees of nozzle structure parameters on jet core section length and axial velocity at X = 0.3 m are: length-diameter ratio > outlet diameter > conic angle > air nozzle diameter > water-air nozzle spacing and outlet diameter > length-diameter ratio > conic angle > water-air nozzle spacing > air nozzle diameter, respectively. The jet core section length and axial velocity both increase exponentially with the increasing outlet diameter, both first increase rapidly and then slowly decreases with the increase of conic angle and water–air nozzle spacing. There is the optimal conic angle of 15° and appropriate water–air nozzle spacing of 3–5 mm. With the increase of length–diameter ratio, they both first decrease rapidly and then slow down, indicating that conical nozzle is more suitable for water jet with air ring. And 0.9–1.2 mm is proper for the air nozzle diameter.

中文翻译：

浸没环境下带气环保护层水射流流场特性及喷嘴结构正交优化

带有空气环保护层的水射流是油气钻井等水下环境中一种很有前途的破岩和提高切削率的方法。射流流场特性决定射流冲击性能，受喷管结构参数影响。本研究对水下环境下带气环的喷水射流进行了数值模拟。通过分析射流速度和含气量在不同截面的分布，得到了带有气环的射流流场结构。采用正交设计方法研究了几个关键喷管结构参数对射流等速芯长和轴向速度的影响。结果表明，径向带气环的射流流场结构包括高速水射流区、气环保护层、气水混合带，具有轴心区能量集中、核心段长、低速衰减等优点。喷管结构参数对射流核心段长度和轴向速度的影响程度X = 0.3 m分别为：长径比>出口直径>锥角>空气喷嘴直径>水气喷嘴间距和出口直径>长径比>锥角>水气喷嘴间距>空气喷嘴直径。射流核心截面长度和轴向速度均随出口直径的增大呈指数增长，均随锥角和水气喷嘴间距的增大先快速增大后缓慢减小。最佳锥角为 15°，水气喷嘴间距为 3-5 mm。随着长径比的增加，两者均先快速减小后变慢，说明锥形喷嘴更适合带气环的水射流。风嘴直径以0.9-1.2mm为宜。

更新日期：2022-10-23

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