基于CFD的液氮消防喷嘴两相流数值分析
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摘要
为了研究液氮消防喷嘴的射流特性,对氮气和水混合喷射的两相流喷嘴建立数学模型和几何模型,利用计算流体力学的方法对气液两相流射流流场的速度、压力、密度等物性参数进行数值模拟仿真分析。并改变喷嘴的入口、出口以及总长度等参数进行仿真,对比不同参数时的射流速度,从而得到喷嘴的最佳尺寸参数。压力仿真云图的结果表明,喷嘴弯折处易出现负压,因此在设计时应将喷嘴设计成曲线型。
In order to study the jet characteristics of liquid nitrogen fire nozzles, a mathematical model and a geometric model of a two-phase nozzle with mixed jet of nitrogen and water were established. The numerical simulation of the velocity, pressure and density of the gas-liquid two-phase flow field was carried out by computational fluid dynamics. The nozzle inlet, outlet and total length of the simulation parameters were changed, the the jet speeds of different parameters were compared, and the optimum nozzle parameters were obtained. The results of the pressure simulation cloud chart indicate that the nozzle is prone to negative pressure at the bend, so the design of the nozzle should be designed to be curved.
In order to study the jet characteristics of liquid nitrogen fire nozzles, a mathematical model and a geometric model of a two-phase nozzle with mixed jet of nitrogen and water were established. The numerical simulation of the velocity, pressure and density of the gas-liquid two-phase flow field was carried out by computational fluid dynamics. The nozzle inlet, outlet and total length of the simulation parameters were changed, the the jet speeds of different parameters were compared, and the optimum nozzle parameters were obtained. The results of the pressure simulation cloud chart indicate that the nozzle is prone to negative pressure at the bend, so the design of the nozzle should be designed to be curved.
引文
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[2] 李楠.气泡雾化喷嘴气液两相流动的数值模拟研究[D].北京:北京交通大学,2015.
[3] ANSYS,Inc.ANSYS FLUENT Theory Guide[Z].2011.
[4] SCHILLER L,NAUMANN Z.A Drag Coefficient Correlation[J].Zeitschrift des Vereins Deutscher Ingenieure,1935,77:318-325.
[5] 刘夷平.水平油气两相流流型转换及其相界面特性的研究[D].上海:上海交通大学,2008.
[6] 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.
[7] 赵昌友.伯努利方程及其应用[J].池州学院学报,2014(6):48-49.
[8] 严导淦.流体力学中的总流伯努利方程[J].物理与工程,2014(4):47-53.YAN D G.The Total Flow Bernoulli Equation in Fluid Mechanics[J].Physics and Engineering,2014(4):47-53.
[9] 杨国来,周文会,刘肥.基于FLUENT的高压水射流喷嘴的流场仿真[J].兰州理工大学学报,2008,34(2):50-53.YANG G L,ZHOU W H,LIU F.Simulation of Flow Field of High-pressure Water-jet From Nozzle with FLUENT[J].Journal of Lanzhou University of Technology,2008,34(2):50-53.
[10] 安辉.内混式双流体渣油雾化喷嘴的实验研究[D].大连:大连理工大学,2003.
[11] 梁强.细水雾灭火系统及雾化喷嘴研究[D].天津:河北工业大学,2005.