气举用脉冲进气自激振荡空气喷嘴数值模拟与试验研究  

Numerical simulation and an experimental study of pulsed inlet self-excited oscillating air nozzles for air lift

作　　者：唐川林 梁晶晶[2] 胡东 杨凤玲 程宏贵[3] TANG Chuanlin;LIANG Jingjing;HU Dong;YANG Fengling;CHENG Honggui(School of Energy and Mechatronics Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China;Water Jet Laboratory,Hunan University of Humanities,Science and Technology,Loudi 417000,China;School of Automotive Mechanical and Electrical Engineering,Loudi Xiaoxiang Vocational College,Loudi 417000,China)

机构地区：[1]湖南人文科技学院能源与机电工程学院,湖南娄底417000 [2]湖南人文科技学院水射流实验室,湖南娄底417000 [3]娄底潇湘职业学院汽车机电工程学院,湖南娄底417000

出　　处：《振动与冲击》2024年第12期30-35,64,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51374101);湖南省教育厅科研项目(21C0783)。

摘　　要：气举(气力泵)广泛应用在海洋采矿、钻孔水力开采、深水清淤等场合,越来越引起用户的重视。国内外学者对提升气举效率做了不少探索性研究,提出了脉冲进气是有效提升气举效率的途径之一,据此,提出一种亥姆霍兹式空气喷嘴,通过此喷嘴产生脉冲射流作为气举的进气方式,达到改善气举性能的目的。依据波涡理论,分析了自激振荡脉冲射流的产生机理;运用Fluent软件,对自激振荡空气喷嘴内流场进行了数值模拟,基于仿真结果进行试验研究。研究表明:结构参数和运行参数对射流特性影响显著。在入口压力为3 bar(1 bar=1×10^(5)Pa),腔长L=64 mm,频率为8 Hz情况下,压力脉动波动差值和幅值最大,产生的空气脉冲射流最显著;幅值随腔长的增大先上升后下降。数值模拟与试验结果一致。研究成果可为空气脉冲射流与气举一体化的工程应用提供参考,具有较高的工程应用价值。Air lift(Pneumatic pump) is widely used in marine mining,drilling hydraulic mining,deep-water dredging,and other occasions,which has attracted more and more attention from users.Scholars at home and abroad have done a lot of exploratory research on improving the efficiency of gas lift,and put forward that pulse air intake is one of the effective ways to improve the efficiency of air lift.Based on this,a Helmholtz air nozzle was proposed.The pulse jet generated by this nozzle was used as the air intake mode of air lift to improve the performance of air lift.Based on the wave vortex theory,the generation mechanism of the self-excited oscillating pulse jet was analyzed.The flow field in the self-excited oscillating air nozzle was numerically simulated by using Fluent software.Experimental research was carried out based on simulation results.Results show that the structural parameters and operation parameters have a significant influence on the jet characteristics,the inlet pressure is 3 bar,the cavity length is L=64 mm,the frequency is 8 Hz,the pressure pulsation fluctuation difference and amplitude are the largest,the air pulse jet is the most significant;the amplitude increases at first and then decreases with the increase of cavity length.The numerical simulation is consistent with the experimental results.The research results can provide reference for the engineering application of the integration of air pulse jet and air lift,and has high engineering application value.

关 键 词：自激振荡脉冲射流 空气喷嘴 腔长 压力脉动 

分 类 号：TH4[机械工程—机械制造及自动化]