新型后混合磨料水射流喷嘴流场数值模拟研究
Numerical Simulation Research on the Flow Field in New Rear-Mixed Abrasive Water Jet Nozzle
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- 引用格式:
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陈晓晨,邓松圣,张滕飞,管金发.新型后混合磨料水射流喷嘴流场数值模拟研究[J].天然气与石油,2018,36(3):0.doi:
Chen Xiaochen, Deng Songsheng, Zhang Tengfei, Guan Jinfa.Numerical Simulation Research on the Flow Field in New Rear-Mixed Abrasive Water Jet Nozzle[J].Natural Gas and Oil,2018,36(3):0.doi:
- DOI:
- 作者:
- 陈晓晨 邓松圣 张滕飞 管金发
Chen Xiaochen, Deng Songsheng, Zhang Tengfei, Guan Jinfa
- 作者单位:
- 中国人民解放军陆军勤务学院油料系
Department of Military Oil, Army Logistics University of PLA
- 关键词:
- 后混合磨料水射流;喷嘴;流场;数值模拟
Rear-mixed abrasive water jet; Nozzle; Flow field; Numerical simulation
- 摘要:
- 磨料水射流切割技术在油库应急抢修中具有重要应用前景。通过数值模拟分析了一种新型后混合磨料水射流喷嘴内部多相流场运动特性,研究结果表明:新型后混合磨料水射流喷嘴内部存在负压,随着水射流向喷嘴下游的喷射运动,水的刚性减小,有利于磨料与水混合;紊动能主要分布在收缩段,为改善水和磨料的混合,建议磨料入口尽量靠近收缩段;喷嘴出口处,磨料主要靠近壁面分布,而水集中在轴线附近,喷嘴出口水和磨料混合不均匀;喷嘴的磨损主要发生在收缩段下游和圆柱段上游。虽然新型后混合磨料水射流喷嘴的多磨料入口结构仍无法彻底解决水和磨料均匀混合的问题,但是喷嘴内部的流场分布更具对称性,喷嘴内表面的磨损相对均匀,一定程度上减小了磨料和水的混合不均匀性,也在一定程度上延长了喷嘴使用寿命。
Abrasive water jet cutting (AWJ) technology has an important application prospect in emergency repair of oil depot. A new type of rear-mixed AWJ nozzle was studied in this paper, and the multiphase flow characteristics in nozzle were analyzed by numerical simulation. The results show that the negative pressure is generated inside the nozzle. As the water moves towards the downstream of the nozzle, the rigidity of the water decreases, which is beneficial to the entry of abrasives.The turbulent kinetic energy is mainly distributed in the contraction section. In order to improve the mixture of water and abrasive, it is recommended that the abrasive inlet be close to the contraction section as close as possible. At the nozzle outlet, the abrasive is mainly distributed near the wall, while the water is concentrated near the axis, and the water and the abrasives mixed unevenly at the nozzle outlet.The wear of nozzle mainly occursat the downstream of the contraction section and upstream of the cylinder section. Although the new rear-mixed AWJ nozzle cannot completely solve the issue of uneven mixture of water and abrasive, the distribution of the abrasive inside the nozzle is more symmetrical and the nozzle wear is relatively uniform, which reduces the inhomogeneity of the abrasive and water and prolongs the service life of the nozzle to a certain extent.
