前缘锯齿形叶片对对旋轴流风机气动性能的影响

The Influence of Serrated Leading Edge Blade on Aerodynamic Performance of Counter-rotating Axial Fan

针对FBD No.8.0型矿用对旋轴流局部通风机,在叶片前缘部分由叶顶到叶根1/3段内开设锯齿结构。利用ANSYS数值分析软件,对比叶片开设锯齿形结构前后的性能曲线和内流特性,探究了前缘锯齿形叶片在不同锯齿结构参数下的影响。结果表明:在设计工况点下,前缘锯齿形叶片能有效提高叶轮的做功能力和碾压破坏叶片附近的涡,进而提高风机整体性能;一级叶轮前缘开设锯齿形结构对风机气动性能的改善要优于二级叶轮;相对齿高为0.56的一、二级叶轮均使用前缘锯齿形结构叶轮改善风机气动特性效果最佳,其全压与效率分别提高了4.52%和2.53%。

For the FBD No.8.0 mine-used counter-rotating axial-flow local fan,the serrated structure is generated at the 1/3 section from the top to the bottom.The performance curve and the inflow characteristics of the blades are compared before and after adjusting the serrated structure based on Ansys,which leads to an exploration the influence of the serrated leading edge blades under the various parameters of the serrated structure.Results show that the serrated leading edge serrated blades can effectively improve the impeller's working capacity,and damage the eddy near the blades,thus improving the overall performance of the fan.The serrated structure on the leading edge of the first-stage impeller improves the aerodynamic performance of the fan better than the second-stage impeller.The first and second stage impellers that both have the serrated leading edge,and relative tooth height is 0.56,can best improve the aerodynamic characteristics of the fan,which increases the total pressure and the efficiency by 4.52%and 2.53%,respectively.