叶片几何参数对轴流叶轮气动性能的影响规律研究

轴流叶轮是轴流式风力灭火机的关键灭火部件,轴流叶轮叶片的安装角度和叶片数是影响轴流式灭火风机气动性能的重要因素,通过对比5种轴流式灭火风机的气动性能实验数据进行分析,研究了不同叶片数和叶片角度对轴流式灭火风机气动性能的影响,得出了其性能参数随叶片角度和叶片数改变的变化规律,试验结果表明:轴流叶轮叶片数为6、叶片角度为38°的5号轴流式灭火风机风量最接近设计风量,达到1 400.3 m3/h,轴功率远小于便携式风力灭火机的功率要求,气动性能良好,基本满足灭火风机的气动性能要求。因此应用于轴流式风力灭火机的轴流叶轮叶片数宜取6片,叶片角度宜取38°。

Research on Influence of the blade geometry parameters on aerodynamic performance of axial-flow impeller

Axial-flow impeller is a main fire-fighting component of axial-flow pneumatic extinguisher. The number and blade angle of axial-flow impeller are important factors affecting aerodynamic performance of axial-flow fire-fighting fan. By comparing and analysing the pneumatic performance experimental data of five axial-flow fans, the influence of different leave number and blade angle on the axial-flow fan aerodynamic performance has been studied, variation regularity about performance parameters changed with leaf number and blade angle has been obtained. The experimental results indicate that: the No.5 axial-flow fan of 6 leaves, 38° blade angle is closest to the designed air flow ,and is up to 1406.1m3/h,The shaft power is far less than the requirements of portable pneumatic extinguisher, it has well aerodynamic performance and basically meets the design requirements of fire-fighting fan. The leaf number of axial-impeller applied on the axial-flow pneumatic extinguisher is equal to 6, the blade angle is 38°.