目前,国内在设计低压轴流风机时,经常采用变环量设计方法。其优点是能充分利用圆周速度较高的叶端部分,以提高叶轮效率和减少叶片的扭曲程度,得到较好的叶型,有利于加工制造。但是这种设计方法由于沿半径方向能量分布不均匀,而带来一系列问题,如速度分布规律的变化等。这将直接影响到计算的精度和风机的性能。这就是我们这篇文章所要研究的问题。 At present, the domestic design of low-pressure axial fans, often variable ring design. The utility model has the advantages of making full use of the tip portion with higher peripheral speed to improve the efficiency of the impeller and reduce the degree of distortion of the blade so as to obtain a better leaf shape and is favorable for processing and manufacturing. However, due to the uneven energy distribution along the radial direction, this design method brings about a series of problems, such as the change of the velocity distribution and the like. This will directly affect the calculation accuracy and fan performance. This is the issue to be studied in this article.