流体机械

2015, v.43;No.517(07) 32-36+41

[打印本页] [关闭]
本期目录(Current Issue) | 过刊浏览(Past Issue) | 高级检索(Advanced Search)

新型旋转射流多孔喷嘴流场的分析
Flow Field Study on a New Kind Swirling Multi-orifices Nozzle

李敬彬;李根生;黄中伟;宋先知;李奎;
LI Jing-bin;LI Gen-sheng;HUANG Zhong-wei;SONG Xian-zhi;LI Kui;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;

摘要(Abstract):

设计了一种适用径向水平井技术的旋转射流多孔喷嘴。其前端面均布3个不同切向倾角15°、30°、45°的孔眼。利用数值模拟方法,采用RNG k-ε湍流模型对该喷嘴流场特征进行了研究,并与试验破岩结果进行了对比。结果表明,15°孔眼轴向速度较大,扩散性差,衰减缓慢,类似直射流,破岩效果适中;30°孔眼轴向、径向、切向速度均较大,扩散性适中,衰减较慢,其破岩效果最佳;45°孔眼虽具有较高切向、径向速度,但扩散性较强,衰减较严重,可形成较大破岩面积,但破岩深度有限;3个孔眼破岩面积在径向存在重叠,当喷嘴旋转时,可轨道扫描式完成联合破岩;不同倾角破岩效果不同,本试验中30°倾角的孔眼破岩效果最佳。流场数值模拟结果与实际破岩效果基本一致。
A new kind swirling multi-orifices nozzle for radial horizontal drilling technology was presented. There were three forward orifices with different tangential inclination uniformly distributed in the front face. The inclination angles were 15°,30° and45°. Three dimensional flow fields of the nozzle were simulated in terms of RNG k- ε turbulent model,also compared with the experiment result. The result shows that the 15°orifice has larger axial velocity and poor diffusivity,so the velocity decays just like the normal jetting and the efficiency of rock breaking is moderate; the 30°orifice has larger axial velocity,radial velocity,tangential velocity and moderate diffusivity,so the velocity decays slowly and high efficiency of rock breaking can be gained; the 45° orifice has largest radial velocity,tangential velocity and diffusivity,so the velocity seriously decays and large area rock can be broken with limited depth; the area of rock breaking of the three orifices covers each other,so when the nozzle swirls the rock breaking can be completed by the track scanning way; different inclination angle has different rock breaking rate,the 30° has the highest rate in this experiment. The simulation result is almost consistent with the experiment result.

关键词(KeyWords): 径向水平井;旋转射流;多孔喷嘴;流场分析
radial horizontal drilling;swirling jet;multi-orifices nozzle;flow field study

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2011ZX05036002);国家科技重大专项(2011ZX05037001)

作者(Author): 李敬彬;李根生;黄中伟;宋先知;李奎;
LI Jing-bin;LI Gen-sheng;HUANG Zhong-wei;SONG Xian-zhi;LI Kui;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;

Email:

DOI:

参考文献(References):

扩展功能
本文信息
服务与反馈
本文关键词相关文章
本文作者相关文章
中国知网
分享