东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (6): 844-849.DOI: 10.12068/j.issn.1005-3026.2018.06.017

• 机械工程 • 上一篇    下一篇

基于排屑性能的扩孔气动冲击器设计方法

徐海良， 周永兴， 徐聪， 赵宏强   

  1. (中南大学 机电工程学院， 湖南 长沙410083)
  • 收稿日期:2017-01-09 修回日期:2017-01-09 出版日期:2018-06-15 发布日期:2018-06-22
  • 通讯作者: 徐海良
  • 作者简介:徐海良(1965-)，男，湖南湘乡人，中南大学教授，博士生导师.冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51375499).国家自然科学基金资助项目(51171041).

Design Method of Reaming Pneumatic Impactors Based on Its Cuttings Removal Performance

XU Hai-liang， ZHOU Yong-xing， XU Cong， ZHAO Hong-qiang   

  1. School of Mechanical and Electrical Engineering， Central South University， Changsha 410083， China.
  • Received:2017-01-09 Revised:2017-01-09 Online:2018-06-15 Published:2018-06-22
  • Contact: XU Hai-liang
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摘要： 为了提高硬质地层中扩孔气动冲击器的排屑性能，基于岩屑颗粒在排屑流场中的临界流速原则，运用计算流体力学理论和Fluent仿真软件，研究了一种与排屑性能相关的扩孔气动冲击器设计方法，并将该设计方法在反向扩孔气动冲击器上进行应用.得到设计前后冲击器排屑流场内气相速度分布规律，岩屑颗粒速度及轨迹变化情况和环路内岩屑颗粒浓度分布情况.研究结果表明:反向扩孔气动冲击器排屑流场环路内岩屑颗粒临界流速为6.02m/s，采用该设计方法能够有效地增加反向扩孔气动冲击器的排屑性能，使得排屑流场环路内气流速度增加到10m/s左右，岩屑颗粒在排屑流场的停留时间减短，流场内颗粒浓度分布范围由0~100kg/m3下降到0~4kg/m3.

关键词: 扩孔气动冲击器, 排屑性能, 设计方法, 气固两相流, 数值模拟

Abstract: In order to improve the cuttings removal performance of reaming pneumatic impactors in hard layers， the computational fluid mechanics theory and Fluent simulation software were employed to find out a design method based on the critical velocity principle of cutting particles， which is related to the cuttings removal performance of reaming pneumatic impactors and then it was applied to the back-reaming pneumatic impactor. The speed distribution regularities of gas phase， the change of cutting particles’ velocity and trajectory， and the concentration distribution of cutting particles in the flow field of the back-reaming pneumatic impactor were obtained. The results showed that the cutting particles’ critical velocity of the back-reaming pneumatic impactor in the cuttings flow field is 6.02m/s. The design method related to cuttings removal performance can effectively strengthen the cuttings removal performance of the back-reaming pneumatic impactor， and the velocity of gas phase increases to 10m/s in the flow field. The time when cutting particles remain in the flow field is shortened， and the value of particle concentration distribution range in the flow field decreases from 0~100kg/m3 to 0~4kg/m3.

Key words: reaming pneumatic impactor, cuttings removal performance, design method, gas-solid two phase flow, numerical simulation

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