摘要
CFD动态分析了回程缓冲机构不同弹簧刚度系数对射流元件控制道内流动特性和活塞回程冲击速度的影响。实验结果表明:缓冲机构施加在活塞上的弹簧作用力不会影响射流元件主射流的正常附壁和切换,刚度系数较大的弹簧可以显著降低活塞回程冲击速度,减小回程中活塞对射流元件的冲击;弹簧增幅在5倍时,活塞回程冲击速度降幅为52.88%,有效避免了射流元件中硬质合金零件在工作中发生断裂的现象。
The effect of rigidity of buffering spring on the flowing character of the liquid in the controlling passages of fluidic element and the backward impact velocity of the piston is studied by means of CFD dynamic analysis and is validated by experiments.The results show that exerting spring force axially on the piston has no effect on the switch of the main jet in the fluidic element,and buffering spring with proper rigidity can make the backward impact velocity decrease greatly,the backward impact velocity of the piston will reduce 52.88% when rigidity of spring enhances five times,which is helpful for reducing impact loads and keeping the parts made of tungsten carbide in the fluidic elements from breaking when the liquid-jet hammer works in well drilling.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第6期1415-1418,1424,共5页
Journal of Jilin University：Earth Science Edition
基金
国家'863'计划项目(2006AA06A109-3-2-1)
关键词
活塞
回程缓冲
主射流切换
CFD动态分析
piston； backward impact buffering； main jet switch； CFD dynamic analysis
