基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究

doi:10.13278/j.cnki.jjuese.201702202

吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (2): 534-541.doi: 10.13278/j.cnki.jjuese.201702202

基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究

张鑫鑫, 彭枧明, 孙铭泽, 吴冬宇

吉林大学建设工程学院/国土资源部复杂条件钻进技术开放研究实验室, 长春 130026

收稿日期:2016-06-04 出版日期:2017-03-26 发布日期:2017-03-26
通讯作者: 彭枧明(1975),男,教授,博士生导师,主要从事多工艺冲击回转钻进技术研究,E-mail:pengjm@jlu.edu.cn E-mail:pengjm@jlu.edu.cn
作者简介:张鑫鑫(1990),男,博士研究生,主要从事多工艺冲击回转钻探工艺及机具研究,E-mail:zxx14@mails.jlu.edu.cn
基金资助:
国土资源公益性行业科研专项（201311112）

Study on the Sealing Characteristics Between the Piston and Cylinder in the High-Energy Liquid-Jet Hammer Based on CFD Method

Zhang Xinxin, Peng Jianming, Sun Mingze, Wu Dongyu

College of Construction Engineering/Laboratory of Technology for Drilling Under Complex Condition of Ministry of Land and Resources, Jilin University, Changchun 130026, China

Received:2016-06-04 Online:2017-03-26 Published:2017-03-26
Supported by:
Supported by Public Science and Technology Research Funds Projects of Ministry of Land and Resources of China(201311112)

摘要/Abstract

摘要： 通过计算流体动力学分析与实验室测试，对SC-86H型高能射流式液动冲击器活塞与缸体密封特性进行研究，分析了活塞密封段长度、环状间隙尺寸、活塞往复运动速度、角速度以及活塞外表面螺旋槽螺距与半径等参数对射流式冲击器前后腔之间泄漏量的影响。结果表明：活塞密封段长度、环状间隙尺寸、角速度以及活塞表面螺旋槽螺距均对射流式液动冲击器性能影响较小；活塞运动速度与泄漏量近似成正比例关系；随着活塞螺旋槽半径的增大，泄漏量会明显增大。活塞回程与冲程初期阶段，活塞运动速度较小，活塞处瞬时泄漏量占进入缸体前后腔流体流量的比例较大，使活塞无法快速加速运动，尤其是当活塞杆直径较大时，回程阶段泄漏量对活塞运动的影响更显著，导致冲击器工作性能大幅下降，甚至无法工作。

关键词: 计算流体动力学, 高能射流式液动冲击器, 活塞, 缸体, 泄漏量

Abstract: The sealing characteristics of the piston and cylinder in the SC-86 H high-energy liquid-jet hammer were studied based on computational fluid dynamics (CFD) analysis and laboratory tests. The effect on the leakage between the front chamber and rear chamber of the liquid-jet hammer were analyzed from the aspects of sealing length, annular gap, reciprocating motion velocity, angular velocity of the piston and the pitch and radius of the spiral groove on the outside surface of the piston. Results showed that little influence on the performance of the liquid-jet hammer was caused by the varying of sealing length, annular gap, angular velocity of the piston and the pitch of the spiral groove on the outside surface of the piston; The leakage between the front chamber and rear chamber is nearly proportional to the reciprocating motion velocity of the piston; While the radius of the spiral groove increased, the leakage increased remarkably; At the beginning of the forward and backward strokes, as the reciprocating velocity of the piston was quite slow, the leakage occupied a large proportion of the total liquid flow into the front chamber and rear chamber, instantaneously, the accelerated motion of the piston was influenced, especially when the diameter of the piston rod was larger to some extent, the piston would not be able to move backward easily, the performance of the liquid-jet hammer will got worse and even was unable to work.

Key words: computational fluid dynamics(CFD), high-energy liquid-jet hammer, piston, cylinder, leakage

中图分类号:

TE242.7

张鑫鑫, 彭枧明, 孙铭泽, 吴冬宇. 基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究[J]. 吉林大学学报(地球科学版), 2017, 47(2): 534-541.

Zhang Xinxin, Peng Jianming, Sun Mingze, Wu Dongyu. Study on the Sealing Characteristics Between the Piston and Cylinder in the High-Energy Liquid-Jet Hammer Based on CFD Method[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(2): 534-541.

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基于CFD的高能射流式液动冲击器活塞与缸体密封特性研究

Study on the Sealing Characteristics Between the Piston and Cylinder in the High-Energy Liquid-Jet Hammer Based on CFD Method

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