淹没条件下环境流速对磨料水射流流场特性的影响
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摘要
基于满足连续介质假设的欧拉模型作为磨料水射流的两相流计算模型和Realizable k-ε湍流模型,对不同环境流速条件下淹没状态磨料水射流的流场做出数值模拟,得出磨料水射流的固液两相流态变化。结果表明:环境水流会对淹没状态下磨料水射流造成明显的偏移,流速越大偏移程度越大;通过对射流结构的分段分析,发现能量损耗以及偏移较大的发生部位为射流基本段;通过对水平和垂直分速度的分析,发现速度方向随着环境流速的变大而增大偏移,速度峰值随着环境流速的变大而增大偏移,总速度趋势与垂直分速度趋势保持一致。该研究可对磨料水射流进行水下作业提供一定的参考。
An Eulerian model which satisfies continuous medium hypothesis and a Realizable k-ε turbulence model were used to simulate the two-phase flow state of underwater abrasive water jet under different environmental flow velocities. The result shows: obvious shifting of jet will happen under environmental flow and become greater with growing environmental flow velocity. Through the section analysis, it is found that the main energy loss and jet shifting happen in basic region. Through the analysis of the horizontal and vertical velocities, it is found that the direction and peak value of jet velocity shift greater as environmental flow increase, the trend of the total velocity stay similar to the vertical velocity. This study provides a reference on using abrasive water jet for underwater engineering.
An Eulerian model which satisfies continuous medium hypothesis and a Realizable k-ε turbulence model were used to simulate the two-phase flow state of underwater abrasive water jet under different environmental flow velocities. The result shows: obvious shifting of jet will happen under environmental flow and become greater with growing environmental flow velocity. Through the section analysis, it is found that the main energy loss and jet shifting happen in basic region. Through the analysis of the horizontal and vertical velocities, it is found that the direction and peak value of jet velocity shift greater as environmental flow increase, the trend of the total velocity stay similar to the vertical velocity. This study provides a reference on using abrasive water jet for underwater engineering.
引文
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[18]魏祥龙.淹没条件下高压水射流的流场特性研究[D].重庆:重庆交通大学,2017.
[19]侯亚康,毛桂庭,阳宁.淹没磨料水射流对花岗岩的冲蚀研究[J].矿冶工程,2011,31(3):18-21.HOU Yakang,MAO Guiting,YANG Ning.Study of granite erosion due to submerged abrasive water jet[J].Mining and Metallurgical Engineering,2011,31(3):18-21.
[2]司鹄,谢延明,杨春和.磨料水射流作用下岩石损伤场的数值模拟[J].岩土力学,2011,32(3):935-940.SI Hu,XIE Yanming,YANG Chunhe.Numerical simulation of rock damage field under abrasive water jet[J].Rock and Soil Mechanics,2011,32(3):935-940.
[3]LU Yiyu,TANG Jiren,GE Zhaolong,et al.Hard rock drilling technique with abrasive water jet assistance[J].International Journal of Rock Mechanics&Mining Sciences,2013,60(2):47-56.
[4]KIM J G,SONG J J.Abrasive water jet cutting methods for reducing blast-induced ground vibration in tunnel excavation[J].International Journal of Rock Mechanics&Mining Sciences,2015,75:147-158.
[5]王福军.计算流体动力学分析:CFD软件原理与应用[M].北京:清华大学出版社,2004.
[6]王明波.磨料水射流结构特性与破岩机理研究[D].北京:中国石油大学,2007.
[7]CROWE C T,SOMMERFELD M,TSUJINAKA Y.Multiphase flow with droplets and particles[M].Boca Raton:CRC Press,1998.
[8]林建忠.流-固两相拟序涡流及稳定性[M].北京:清华大学出版社,2003.
[9]林晓东.前混合磨料射流磨料粒子加速过程的数值模拟[D].重庆:重庆大学,2014.
[10]董星.前混合式磨料水射流磨料颗粒运动的理论分析[J].黑龙江科技学院学报,2001,11(3):4-6.DONG Xing.Theoretical analysis of abrasive particle movement in front mixed abrasive jet[J].Journal of Heilongjiang Institute of Science and Technology,2001,11(3):4-6.
[11]铁占绪.磨料射流中磨料粒子的加速机理和运动规律[J].焦作矿业学院学报,1995(4):39-42.TIE Zhanxu.Acceleration mechanism and motion law of abrasive particles in abrasive water jet[J].Journal of Jiaozuo Institute of Mining,1995(4):39-42.
[12]陆国胜,龚烈航,王强,等.前混合磨料水射流磨料颗粒加速机理分析[J].解放军理工大学(自然科学版),2006,7(3):275-280.LU Guosheng,GONG Liehang,WANG Qiang,et al.Analysis of acceleration mechanism of abrasive grains in front mixed abrasive jet[J].PLA University of Science and Technology(Natural Science),2006,7(3):275-280.
[13]杨国来,李强,陈俊远,等.磨料喷嘴内磨料颗粒加速机理分析[J].机床与液压,2011,39(19):54-57.YANG Guolai,LI Qiang,CHEN Junyuan,et al.Analysis of acceleration mechanism of abrasive particles in abrasive nozzle[J].Machine Tool&Hydraulics,2011,39(19):54-57.
[14]董志勇.射流力学[M].北京:科学出版社,2005.
[15]ABRAMOVICH G,SCHINDEL L.General properties of turbulent jets[M].Cambridge:MIT Press,1963.
[16]KUETHE A M.Investigations of turbulent mixing regions[D].Pasadena:California Institute of Technology,1933.
[17]王瑞和,白玉湖.井底受限射流流场的数值模拟[J].中国石油大学学报(自然科学版),2003,27(5):36-38.WANG Ruihe,BAI Yuhu.Numerical simulation on flow field of confined water jet at bottom hole[J].Journal of China University of Petroleum(Natural Science),2003,27(5):36-38.
[18]魏祥龙.淹没条件下高压水射流的流场特性研究[D].重庆:重庆交通大学,2017.
[19]侯亚康,毛桂庭,阳宁.淹没磨料水射流对花岗岩的冲蚀研究[J].矿冶工程,2011,31(3):18-21.HOU Yakang,MAO Guiting,YANG Ning.Study of granite erosion due to submerged abrasive water jet[J].Mining and Metallurgical Engineering,2011,31(3):18-21.