远射程消防水炮流道内导流片的性能分析  

Performance analysis of guide vane in long-range firefighting water cannon

作　　者：袁丹青[1] 石荣[1] 丛小青[1] 季明[1] YUAN Danqing SHI Rong CONG Xiaoqing fl Ming(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2017年第4期333-339,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51176065)

摘　　要：为提高消防水炮射程,消除管内流道中的涡流和横向流,需在弯管流道内安放导流片.以5种不同曲率半径的弯管为对象,在管内安放位置不同、数量不同的导流片,进行水炮设计流量为400 m^3/h的内部流动数值模拟.结果表明:安放导流片可消除管内湍流核心区,改善流动状态,减小出口湍动能.当曲率半径为1.2~1.4倍的管内径时,安放导流片后管内的湍动能大幅减小,且出口最大湍动能为不加导流片时的一半以下;曲率半径较小时,安放单片导流片的进出口压差与安装双片导流片的压差相差不大;曲率半径大于管内直径时,前者的压差小于后者的压差;在靠近弯管内壁安放单片导流片后,水炮结构紧凑,且压差比双片导流片小,管内流体的旋转和振动最少,因此在设计消防水炮时优先选择单片导流片.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 pres- sure of the guide vane and the double ones are 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, which has compact structure of the water cannon, and its pressure difference is less than that of double ones, and the vibration and rotation in the tube are rela-tively small. In the design of fire water cannon, it should give priority to the selection of single guide vane.

关 键 词：消防水炮 导流片 内部流道 数值模拟 湍动能 

分 类 号：S277.9[农业科学—农业水土工程] TP6[农业科学—农业工程]