摘要
为增强空化射流的冲击效果,采用数值模拟和试验研究相结合的方法,开展空化喷嘴射流冲击性能的研究。对锥形喷嘴、缩扩形喷嘴、亥姆霍兹喷嘴、风琴管喷嘴进行空化冲击效果对比,并深入研究冲击靶距对喷嘴空化冲击性能的影响。结果表明,喷嘴内产生的空化泡会经历初生、发展和溃灭3个阶段,空化泡在喷嘴内部实现初生,在外流场发展至极限状态,最后在冲击标附近溃灭,从而产生强大的冲击力;相比于锥形喷嘴、缩扩形喷嘴和亥姆霍兹喷嘴,风琴管喷嘴的空化冲击效果最好;在相同工作条件下,风琴管喷嘴冲穿套管的时间最短,相比于锥形喷嘴,冲击时间缩短90%,形成的冲击孔大小扩大80%;冲击靶距对喷嘴空化冲击性能存在显著影响,在一定范围内,随着冲击靶距的增大,空化射流的冲击性能呈现先提高后降低的趋势,相比冲击靶距5 mm,冲击靶距10 mm时,风琴管喷嘴冲穿套管的时间缩短41.4%。研究结果可为空化射流的应用提供理论依据。
In order to enhance the impact effect of cavitation jet,the impact performance of cavitation nozzle jet was studied by using the method of combining numerical simulation and experimental research.The cavitation impact effect of conical nozzle,contraction and expansion nozzle,Helmholtz nozzle and organ pipe nozzle was compared,and the impact of impact standoff distance on the impact performance of nozzle was deeply studied.The results show that the cavitation bubbles generated in the nozzle will go through three stages:initial,development and collapse.The cavitation bubbles are initially generated in the nozzle,and finally develop to the limit state in the external flow field,and then collapse near the impact target,thus producing a strong impact force.Compared with conical nozzle,contraction and expansion nozzle and Helmholtz nozzle,organ pipe nozzle has the best cavitation impact effect.Under the same working conditions,the time for the organ pipe nozzle to penetrate the sleeve is the shortest,and the impact time is shortened by 90%compared to the conical nozzle.The size of the impact hole formed is expanded by 80%compared to the conical nozzle;The impact standoff distance has a significant impact on the impact performance of nozzle cavitation.Within a certain range,with the increase of the impact standoff distance,the impact performance of cavitation jet shows a trend of first increasing and then decreasing.Compared to the impact standoff distance of 5 mm,the sleeve piercing time of the organ pipe nozzle is shortened by 41.4%when the impact standoff distance is 10 mm.The results of this study can provide a theoretical basis for the application of cavitation jets.
作者
杜卫刚
孟翔
徐浩磊
葛家旺
季鹏
关利永
庞振力
杨硕
DU Weigang;MENG Xiang;XU Haolei;GE Jiawang;JI Peng;GUAN Liyong;PANG Zhenli;YANG Shuo(Tianjin Branch of CNPC Offshore Engineering Co.,Ltd.,Tianjin 300451,China;College of Electromechanical Engineering,China University of Petroleum(East China),Qingdao 266580,China)
出处
《流体机械》
CSCD
北大核心
2024年第12期16-22,共7页
Fluid Machinery
基金
国家自然科学基金面上项目(52171287)
中国石油天然气集团有限公司科学研究与技术开发项目(2021DJ4902)
山东省自然科学基金面上项目(ZR2023ME022,ZR2022ME106)。
关键词
空化喷嘴
喷嘴结构
计算流体力学
射流参数
冲击试验
cavitation nozzle
nozzle structure
computational fluid dynamics
jet parameters
impact experiment
