以一台已有对旋风机为原型进行三维数值计算,通过计算结果分析风机内部流动.在对数值结果和速度三角形分析的基础上,通过调整叶片的叶型弯角和扭转角改变叶片气流攻角及其内部流动进行了叶片的三维造型优化.对优化结果计算分析表明优化后对旋风机的内部流场更为合理,通道涡得到了抑制.计算结果和试验数据表明优化后对旋风机比优化前最大流量提高1 m3/s、最大全压升提高1300 Pa,效率和功率在大流量下有所改善.“,”Three-dimensional calculations were conducted for an existing counter-rotating fan and the results were used to analyze the flow in the fan. Based on the analysis of calculation and velocity triangle, the optimization was conducted by adjusting angles of turning and angles of twist. The results of calculations for optimized fan showed that flow in optimized fan was more reasonable and the passage vortex disappeared. The results of calculation and the experiment data showed that the maximum volume flow rate was increased by 1 m3/s, maximum pressure was increased by 1300 Pa, efficiency and power were improved obviously under the large mass flow for optimized fan.