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采用数值计算和实验模拟方法研究对旋风机前后两级叶轮转速改变对风机气动特性的影响。首先,通过速度三角形定量分析转速改变对风机功率和内部流动参数的影响。之后,数值计算的结果与实验进行对比,分析基准转速下风机整体性能的变化。最后,通过数值计算结果对风机内部气体的流动进行具体分析,发现在保持进口条件不变的条件下,前后两级叶轮转速改变相同百分比时,第一级转速改变可以更加有效的改变风机的流动参数和性能,综合比较整体性能变化与实际应用确定了最优转速比为1.1:1,此转速比下传动效率为88.4%时对旋风机效率为75%。
The numerical simulation and experimental simulation are used to study the influence of the change of impeller rotational speed on the aerodynamic characteristics of the fan before and after the cyclone. Firstly, the influence of speed change on fan power and internal flow parameters was quantitatively analyzed by speed triangle. Afterwards, the result of numerical calculation is compared with the experiment, and the change of fan’s overall performance under the reference speed is analyzed. Finally, the numerical analysis of the gas flow inside the fan is carried out. It is found that the change of the first-stage speed can effectively change the flow of the fan when the impeller speed changes by the same percentage without changing the inlet conditions Parameters and performance, the comprehensive comparison of the overall performance changes and practical applications to determine the optimal speed ratio of 1.1: 1, the speed ratio of 88.4% under the efficiency of the cyclone when the efficiency of 75%.