大型电站子午加速轴流通风机逆向工程设计

摘要

In this paper, an imported meridian accelerated axial induced fan applied in large scale power plant was investigated. Firstly, eroded blade and hub surfaces of axial fan were scanned and with optical three-dimensional scanner and the three-dimensional surface model of axial fan blades was made by reverse engineering. Then, according to the surface model and actual wear of blades, the blade had been redesigned based on the original design ideas and blade parameters, and the fully three-dimensional solid model of the fan impeller has been established. Finally, numerical simulation for inner-flow of the remodeled fan was carried out under different working conditions and aerodynamic performance curve was obtained. The results show that the internal flow of axial fan is stable, the efficiency is higher and the aerodynamic performance fully meets the design requirements in a wider range of flowrate.%本文研究对象是某大型火电站国外进口的子午加速轴流引风机。首先应用光学三维扫描仪测量系统对叶片严重磨损的轴流通风机叶轮进行了扫描测绘；然后采用逆向工程方法，建立了原型（磨损）轴流通风机叶片的三维曲面模型；依据曲面模型及叶片实际的磨损情况，提取和推断出叶片的原始设计思想和参数，并对叶片叶型进行了重新设计，建立了风机叶轮的完整三维实体模型；最后，对重新造型的轴流通风机的内部流场进行数值模拟，预测通风机的气动性能并得到了轴流通风机的性能曲线。计算结果表明，在较宽的流量范围内，轴流通风机内的流动稳定，效率较高，气动性能完全达到设计要求。