轴流式风力灭火机设计及仿真

Design and simulation analysis of axial-flow pneumatic extinguisher

为解决风力灭火机操作人员负担过重,灭火效率不高的问题,设计了一种具有同轴双级叶轮结构的轴流式风力灭火机,采用孤立翼型设计方法以及机翼翼型NACA6409设计叶轮,并应用Ansys-Fluent软件对轴流风机不同叶轮安装间距进行仿真。仿真结果表明轴流式风力灭火机叶轮间距为20mm时出口风速最高,空气在双级叶轮作用下提速12%,风筒内无明显对涡、通道涡、间隙涡等现象,出口风量为0.408m^(3)·s^(-1),有效风力灭火距离为1.5m,主要性能参数达到国家标准。

In order to solve the heavy burden of the operator of the pneumatic fire extinguisher,the fire extinguishing efficiency is not high.An axial-flow wind extinguisher with coaxial two-stage impeller is designed in this paper.The impeller was designed by using isolated airfoil design method and mechanical NACA6409.The software ANsys-Fluent was used to simulate the installation spacing of different impeller of axial flow fan.The simulation results show that when the impeller spacing of axial flow wind extinguisher is 20mm,the outlet wind speed is the highest,the air speed is increased by 12%under the action of double-stage impeller,there is no obvious opposite vortex,passage vortex,clearance vortex and other phenomena in the air duct,the outlet air volume is 0.408 m^(3)·s^(-1),the effective wind extinguishing distance is 1.5m,and the main performance parameters meet the national standards.