摘要
双射流是由由心直射流和同轴的环形旋转射流形成的一种新型高效射流，用双射流能够克服门限压力与高破岩比能的制约而高效破岩。采用破岩实验研究了喷嘴锥角、叶片出口角、内喷嘴直径、喷距和压力5个主摹参数对双射流破岩效果的影响。结果表明，喷嘴入口锥角为60°、叶片出口角为18°的喷嘴产生的射流具有较强的破岩能力；当双射流喷嘴当量直径一定时，大的内喷嘴直径获得的破岩深度较大但会减小破岩体积；实验条件下，双射流破岩的最优喷距为10～20m，破岩门限压力为20～25MPa，破岩体积随压力的增加而增加。
Dual-jet is a new kind of high efficient jet, which is formed by combining round straight jet with circular conical swirling jet. And the dual-jet can overcome the limits of high threshold pressure and high rock breaking energy. The effects of parameters including nozzle cone angle, swirling path angle, nozzle diameter, sandoff distance and pressure on reck breaking efficiency of dual-jet were researched by rock breaking experiment. The results show that the dual-jet nozzle with a cone angle Of 60° and a swirling path angle of 18° can produce the largest rock breaking volume. And while keeping the equivalent nozzle diameter, the nozzle with larger internal nozzle diameter can produce larger breaking depth and smaller cutting volume. The optimal sandoff distance ranges from 10 to 20 mm, and the optimal threshold pressure ranges from 20 to 25 MPa. The cutting volume increases with the jet pressure increasing.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第1期68-71,共4页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金重大计划项目(90410007)
教育部创新团队计划项目资助(IRT0411)
关键词
旋转射流
喷嘴
双射流
破岩
钻井
实验研究
swirling jet
nozzle
dual-jet
rock breaking
drilling
experimental study
