利用数值计算软件对G47-3 No.8D风机进气箱内的三维流场进行了数值研究，发现流场中存在一个小涡流区以及一个由强涡流和回流交织而成的压力损失区域。针对进气箱中流场的分布规律对进气箱进行了改造，并进行数值模拟。结果显示：原模型中的大涡流已经变成2个在强度和尺寸方面均较小的涡流，原模型中的小涡流已经消失，回流也在一定程度上得到抑制。

3-demension flow field in inlet box of G47-3 No.8D fan were studied numerically by using CFD, which showed that there was a small and a pressure loss region formatted by strong eddy current and reflux. According to the distribution of flow field, reformation and simulation were carried out on the inlet box. The results show that the big eddy current in old model has changed into two eddy current which are small in strength and size, the small eddy current in the old model has disappeared, as well as the reflux has been suppressed to some extent.