Numerical Simulation and Analysis on Flow Field Structure and Hard Rock Erosion Potential of Disc-slotted Pulse Water Jet
LU Zhaohui1,2,3， LU Yiyu2，Michael Hood3，PAN Linhua1，HE Pei1
1.Ministry of Land and Resources Key Laboratory of Shale Gas Exploration,Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,China;
2.State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;
3.Cooperative Research Centre of Mining,The University of Queensland, Brisbane 4072, Australia
Abstract：Disc-slotted pulse water jet is a potential tool to break hard rock due to its special loading styles of water hammer pressure，ultra-speed lateral jetting and pulse dynamic load etc. Aiming to investigate the flow filed of the jet, a two-phase-flow transient computational model, matching with the geometry and motion of interrupted water jet generating device, was established to simulate dynamic evolution and characteristics of a single pulsation within 100 mm standoff based on volume of fluid (VOF) model and dynamic mesh theory. The results show that the head of the pulsed jet forms deflective slug structure which is consistent with the result from high-speed photography experiment. The slug head velocity is lower than jet outlet and the jet turbulence mainly distributes over boundary layers between jet and air and the deflective side. Tile-shaped stereo-Structure is yielded during the pulse formation process. It presents non-axisymmetric flow pattern when impacting target, which consists with the irregular erosion cavity obtained by hard rock fragmentation experiment.
陆朝晖1,2,3?，卢义玉2，Michael Hood3，潘林华1，贺培1. 截断式脉冲射流流场结构模拟与冲蚀硬岩能力分析[J]. 振动与冲击, 2017, 36(19): 180-185.
LU Zhaohui1,2,3， LU Yiyu2，Michael Hood3，PAN Linhua1，HE Pei1. Numerical Simulation and Analysis on Flow Field Structure and Hard Rock Erosion Potential of Disc-slotted Pulse Water Jet. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(19): 180-185.
[1] 徐小荷, 余静. 岩石破碎学[M]. 煤炭工业出版社, 1984.
[2]李晓红，卢义玉，向文英．水射流技术及在矿业工程中的应用[M]．重庆：重庆大学出版社，2007．
[3] Dehkhoda S, Hood M. The internal failure of rock samples subjected to pulsed water jet impacts[J]. International Journal of Rock Mechanics and Mining Sciences, 2014, 66: 91-96.
[4] Dehkhoda S, Hood M. An experimental study of surface and sub-surface damage in pulsed water-jet breakage of rocks[J]. International Journal of Rock Mechanics and Mining Sciences, 2013, 63: 138-147.
[5]司鹄,薛永志. 基于SPH算法的脉冲射流破岩应力波效应数值分析[J].振动与冲击,2016,05:146-152.
SI Hu, XUE Yong-zhi. Numerical analysis for stress wave effects of rock broken under pulse jet[J].Journal of vibration and shock, 2016,05:146-152.
[6] 王乐勤,焦磊,徐如良,等.脉冲射流作用下驻点压力特性的试验研究[J].工程热物理学报,2005, 26 (1):69-71.
WANG Le-qin, JIAO Lei, XU Ru-liang, et al. Experimental study on stagnation pressure of pulse jet[J]. Journal of Engineering Thermophysics, 2005, 26 (1): 69-71.
[7] Ma Y, Zhu D Z, Rajaratnam N, et al. Experimental study of the breakup of a free-falling turbulent water jet in air[J]. Journal of Hydraulic Engineering, 2016: 06016014.
[8]陆朝晖,卢义玉,夏彬伟,等.冲击挤压式脉冲射流动力特性数值模拟[J].中国石油大学学报(自然科学版),2013,37(4):104-108.
LU Zhao-hui, LU Yi-yu, XIA Bin-wei, et al. Numerical simulation on hydrodynamic characteristics of percussion pulsed jet[J]. Journal of China University of Petroleum, 2013,37(4):104-108.
[9]Anglani F, Barry J, Dekkers W, et al. CFD modelling of a water-jet cleaning process for concentrated solar thermal (CST) systems[C]. 3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015., 2015.
[10]Li D, Kang Y, Ding X, et al. Effects of area discontinuity at nozzle inlet on the characteristics of high speed self-excited oscillation pulsed waterjets[J]. Experimental Thermal and Fluid Science, 2016.
[11] Srinivasan V, Salazar A J, Saito K. Modeling the disintegration of modulated liquid jets using volume-of-fluid (VOF) methodology[J]. Applied Mathematical Modelling, 2011, 35(8):3710-3730.
[12]汪剑锋. 水下超声速气体射流喷射过程及周围复杂流场的数值计算[D].杭州:浙江理工大学,2014.
WANG Jian-feng. Numerical Simulation on the Injection Process and Surrounding Complex Flow Fields of Underwater Supersonic Gas Jets[D].Hangzhou: Zhejiang Sci-Tech University,2014.
[13]Pan Z, Weibel J A, Garimella S V. Spurious current suppression in VOF-CSF simulation of slug flow through small channels[J]. Numerical Heat Transfer, Part A: Applications, 2015, 67(1): 1-12.
