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作了不少探索性研究，提出了脉冲进气是有效提升气举效率的途径之一，据此，提出一种亥姆赫兹式(Helmholtz)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，基于仿真结果进行实验研究。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3bar，腔长L=64mm，频率为8Hz，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。数值模拟与实验结果一致。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。
Abstract
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 is proposed. The pulse jet generated by this nozzle is 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 is analyzed. the flow field in the self-excited oscillating air nozzle is numerically simulated by using Fluent software, Experimental research based on simulation results. The results shows that the structural parameters and operation parameters have a significant influence on the jet characteristics, the inlet pressure is 3bar, the cavity length is L=64mm, the frequency is 8Hz, 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
{{custom_keyword}} /
Key words
self-excited oscillating pulse jet /
air nozzle /
cavity length /
pressure pulsation
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1]唐川林,胡东,杨林.气举工作特性的实验与应用[J].煤炭学报,2008(03):347-352.
Tang Chuanlin, Hu Dong, Yang Lin. Experiment and application of working characteristics of air lift [J].Acta Coal Sinica, 2008 (03): 347,352.
[2]胡东,唐川林,张凤华等.钻孔水力开采用气力提升装置模型的建立及实验研究[J].煤炭学报,2012,37(03):522-527
Hu Dong, Tang Chuanlin, Zhang Fenghua, etc. Model establishment and experimental study of pneumatic lifting device for borehole hydraulic mining [J].Journal of Coal, 2012, 37 (03): 522-527
[3]叶建桃.河道清淤疏浚施工技术控制措施探讨[J].珠江水运,2018(24):94-95.
Ye Jiantao.Discussion on technical control measures of river dredging construction [J].Pearl River Wzhenaterway, 2018 (24): 94-95.
[4]Moisidis T C,Kastrinakis G E. Two-phase flow pattern transitions of short airlift pumps[J]. Journal of Hydraulic Research,2010,48(5).
[5]Hanafizadeh P,Saidi H M,Karimi A, et al. Effect of Bubble Size and Angle of Tapering Upriser Pipe on the Performance of Airlift Pumps[J]. Particulate Science and Technology,2010,28(4).
[6]Hanafizadeh P,Karimi A,Saidi H M. Effect of Step Geometry on the Performance of the Airlift Pump[J]. International Journal of Fluid Mechanics Re-search,2011,38(5).
[7]Mohd. S S Y,Nik A M N A,Zainal Z, et al. A Study of Continuous Flow Gas Lift System Using CFD[J]. Journal of Applied Sciences,2014,14(12).
[8]左娟莉,李逢超,郭鹏程等.不同进气方式下气力提升泵水力特性理论模型与验证[J].农业工程学报,2017,33(21):85-91.
Zuo Juanli, Li Fengchao, Guo Pengcheng, etc.Theoretical model and verification of hydraulic characteristics of pneumatic lift pump under different intake modes [J].Journal of Agricultural Engineering, 2017. 33 (21): 85-91.
[9]廖振方,陈德淑,邓晓刚等.三峡库区疏浚及清淤用机电一体化成套气举装置[J].重庆大学学报(自然科学版),2003(03):1-4.
Liao Zhenfang, Chen Deshu, Deng Xiaogang, etc.Mechatronics gas lift device for dredging and dredging in the three Gorges Reservoir area [J].Journal of Chongqing University (Natural Science Edition), 2003 (03): 1-4.
[10]廖振方，唐川林，张凤华,自激振荡脉冲射流喷嘴的试验研究.重庆大学学报:自然科学版，2002，(2):28-32.
Liao Zhenfang, Tang Chuanlin, Zhang Fenghua, Ex-perimental study on self-excited oscillating pulsed jet nozzles.Journal of Chongqing University: natural Science Edition, 2002, (2): 28-32
[11]李晓红,杨林,王建生,等.自激振荡脉冲射流装置的固有频率特性[J].煤炭学报, 2000,25(6):641-644.
Li Xiaohong, Yang Lin, Wang Jiansheng, et al.Natural frequency characteristics of self-excited oscillating pulsed jet device [J].Journal of Coal, 2000,525 (6): 641-644.
[12]唐川林,胡东,张凤华,等.自振脉冲气液射流振动分析[J].力学学报,2013,45(4):534-540.
Tang Chuanlin, Hu Dong, Zhang Fenghua, et al.Vibration analysis of natural vibration pulsed gas-liquid jet [J].Chinese Journal of Mechanics, 2013 534-540.
[13]葛兆龙,周哲,卢义玉等.影响自激振荡脉冲射流性能的喷嘴结构参数研究[J].四川大学学报(工程科学版),2013,5(05):160-165.
GE Zhaolong, Zhou Zhe, Lu Yiyu, etc.Study on nozzle structure parameters affecting the performance of self-excited oscillating pulsed jet [J].Journal of Sichuan University (Engineering Science Edition), 2013 5 (05): 160-165.
[14]Kolsek T , Jelic N , Duhovnik J .Numerical study of flow asymmetry and self-sustained jet oscillations in geometrically symmetric cavities[J].Applied Mathematical Modelling, 2007, 31(10):2355-2373.
[15]马飞，蔡腾飞，柳靖，等. 自振射流频率特性的试验研究[J]. 机械工程学报，2016，52(14)：182-187.
Ma Fei, Cai Tengfei, Liu Jing, etc. Experimental study on frequency characteristics of self-vibrating jet [J]. Journal of Mechanical Engineering, 2016 552 (14): 182-187
[16] Fang Z L ,Kang Y ,Yang X F , et al. The influence of collapse wall on self-excited oscillation pulsed jet nozzle performance[J]. IOP Conference Series Earth and Environmental Science, 2012, 15(5):2022.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(1901 KB)
