Numerical simulation of internal flow in a large-turning fire water cannon barrel with elliptical cross-sectional shapes
XU Jie1,YUAN Shouqi1,XUE Lin2,XIANG Qingjiang1*
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Shanghai Fire Research Institute of Ministry of Public Security(MPS), Shanghai 200032, China
Abstract：Taking the largerotation and largeflow fire water cannon barrel as the research object, the computational fluid dynamics software FLUENT was used to numerically calculate the threedimensional steady flow in the fire water cannon barrel with circular crosssection and elliptical crosssection under three flow conditions. By analyzing the hydraulic loss of the fluid in the barrel of different crosssections and the flow pattern of the outlet, the influence rule of the crosssection change on the internal flow of the fire water cannon barrel was obtained. The results show that under the three flow conditions, the hydraulic force of the round crosssection barrel and the noncircular crosssection barrel is hydraulic. The loss difference is small, and the variation range is within 2.7%; the turbulent kinetic energy of the outlet increases with the increase of the elliptical eccentricity of the barrel section, and gradually deviates from the center axis of the pipe; at the exit of the round barrel and noncircular barrel, the positive and negative vortices offset the reduction of vortex flux, the streamline density of the outlet of the round crosssection barrel and the outlet of the vertical ellipse crosssection barrel is more uniform than that of the horizontal ellipse crosssection barrel, and the vertical ellipse crosssection barrel with the same eccentricity is 21% lower than the average exit velocity deviation of the transverse elliptical barrel.
徐捷,袁寿其,薛林,向清江*. 椭圆截面形状大回转消防水炮炮管内流数值模拟[J]. 排灌机械工程学报, 2022, 40(4): 391-397.
XU Jie,YUAN Shouqi,XUE Lin,XIANG Qingjiang*. Numerical simulation of internal flow in a large-turning fire water cannon barrel with elliptical cross-sectional shapes. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(4): 391-397.
