Abstract:To achieve a longer range of the most widely used fire-fighting water cannon, the vortex and the transverse flow in the tube must be eliminated.The deflector or straightener placed in the bend channel is used to reduce outlet turbulent kinetic energy in the tube. The internal flow of water cannon with 5 different curvature radius bend tubes is studied at 400 m3/h design flow. Simultaneously, the placement and number of guide vane is different. The results show that the turbulent core area can be eliminated and the flow pattern is improved evidently when guide vane is installed. When the curvature radius of the bend tube is 1.2~1.4 times the pipe diameter, the turbulent kinetic energy in the tube is greatly reduced, and its maximum turbulent kinetic energy is less than half of the case without guide vane. When the curvature radius is smaller, the pressure difference between the inlet and outlet pressure of theguide vane and the double ones is not quite different; while the curvature radius is larger than the pipe diameter, the pressure difference of the former is less than that of the latter. The single guide vane is placed near the inner wall, it not only has compact structure of the water cannon, but its pressure difference is less than that of double ones, and the vibration and rotation in the tube are relatively small.In the design of fire water cannon, we should give priority to the selection of single guide vane.
[1]MARBACH G, LOEPFE T, BRUPBACHER M. An ima-ge processing technique for fire detection in video images[J]. Fire safety journal, 2006,41(4):285-289.[2]闵永林,陈晓阳,陈池,等. 考虑俯仰角的消防水炮射流轨迹理论模型[J].机械工程学报,2011,47(11):135-137. MIN Yonglin, CHEN Xiaoyang, CHEN Chi, et al. Pitching angle-based theoretical model for the track simulation of water jet out from water fire monitors[J]. Journal of mechanical engineering,2011,47(11):135-137.(in Chinese)[3]胡国良,龙铭,高志刚.消防水炮喷嘴射流特性分析[J].液压与气动,2012(7):93-97. HU Guoliang, LONG Ming, GAO Zhigang. Jet characteristics analysis of fire water monitor′s nozzle[J]. Chinese hydraulics & pneumatics, 2012(7):93-97.(in Chinese)[4]胡国良,陈伟刚.PS100型固定式消防水炮水力学性能研究[J].机械设计与制造,2011(11):87-89. HU Guoliang, CHEN Weigang.Hydraulic performance research of PSl00 type fixed fire water monitor[J].Machinery design & manufacture, 2011(11):87-89.(in Chinese)[5]庞生敏,陈沛民.基于CFD的圆柱形喷嘴设计[J].机械制造与研究, 2011,40(1):41-42,89. PANG Shengmin, CHEN Peimin.Taper nozzle design on CFD[J]. Machine building and automation, 2011,40(1):41-42,89.(in Chinese)[6]何枫,谢峻石,杨京龙.喷嘴内部流道型线对射流流场的影响[J].应用力学学报,2001,18(4):114-119. HE Feng, XIE Junshi, YANG Jinglong. Influence of nozzle internal flow path on the jet flow field[J]. Chinese journal of applied mechanics, 2001,18(4):114-119.(in Chinese)[7]朱勇,钟声玉,廖其奠,等.改善高压水射流性能的研究[J].上海机械学院学报,1987,9(2):31-38,48. ZHU Yong, ZHONG Shengyu, LIAO Qidian, et al.How to improve the properties of water jet[J].Journal of Shanghai Institute of Mechanical Engineering, 1987,9(2):31-38,48.(in Chinese)[8]刘力涛,马振明. 消防水炮喷嘴喷射性能影响因素分析[J].能源研究与信息, 2011,27(2):105-109. LIU Litao, MA Zhenming. Study on influencing factors of nozzle performance of the fire water monitor[J]. Energy research and information,2011,27(2):105-109.(in Chinese)[9]严海军,徐成波,陆文红,等.摇臂式喷头内流道流动分析与数值模拟[J].水利学报,2009, 40(1):122-127. YAN Haijun, XU Chengbo, LU Wenhong, et al. Numerical simulation of internal flow field in impact sprinkler[J]. Journal of hydraulic engineering,2009,40(1):122-127.(in Chinese)[10]王红霞,廖振方,陈德淑,等.改进消防水枪性能的实验研究[J].消防科技与技术,2004,23(2):159-161. WANG Hongxia, LIAO Zhenfang, CHEN Deshu et el.Experimental study on performance improvement of fire gun[J].Fire science and technology, 2004,23(2):159-161.(in Chinese)[11]王红霞.消防水枪整流装置的分析及试验研究[J].装备维修技术,2007(2):10-13. WANG Hongxia. The analysis and experiment study of fire fighting hydraulic giant stabilization device[J]. Technology of equipment maintenance,2007(2):10-13.(in Chinese)[12]邵大财,张志榜,张世凤.消防炮主要结构简析与主要设计参数计算[J].机械制造, 2013,42(3):39-40,49. SHAO Dacai, ZHANG Zhibang, ZHANG Shifeng.Main structure analysis and design parameters calculation of fire monitor[J]. Machine building and automation, 2013,42(3):39-40,49.(in Chinese)[13]向清江,施哲夫,李红,等.远射程消防水炮流道内3种稳流器的对比[J].排灌机械工程学报, 2015,33(3):233-238. XIANG Qingjiang, SHI Zhefu, LI Hong, et al.Compa-rative analysis of three types of straightener in long range fire fighting water cannon[J]. Journal of drainage and irrigation machinery engineering, 2015,33(3):233-238.(in Chinese)[14]李力欣.基于并联机构的消防炮设计与分析[D].南昌:华东交通大学,2012.[15]琚学振.消防炮射流关键技术研究[D].哈尔滨:哈尔滨工业大学,2012.[16]曾庆龙,龙新平,肖龙洲,等.环形射流泵结构优化设计[J].排灌机械工程学报,2014,32(12):1-5. ZENG Qinglong, LONG Xinping, XIAO Longzhou, et el.Structure optimization of annular jet pumps[J]. Journal of drainage and irrigation machinery engineering, 2014,32(12):1-5.(in Chinese)[17]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.[18]胡国良.固定式消防水炮的设计及仿真分析[J].液压与气动,2009(1):41-43. HU Guoliang.Design and simulation analyses of fixed fire water monitor[J]. Chinese hydraulics & pneuma-tics,2009(1):41-43.(in Chinese)[19]胡国良,刘世鸿,李刚,等.消防水炮稳流器结构对射流特性的影响分析[J]. 液压与气动,2015(7):41-45,83. HU Guoliang, LIU Shihong,LI Gang,et al.Effects of atraightener structure of fire water monitor on the jet performance[J]. Chinese hydraulics & pneumatics, 2015(7):41-45,83.(in Chinese)