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本文通过模型实验对梯形巷道两道风窗时的局部阻力进行了分析研究，结果表明，由于理论计算公式没有考虑巷道断面收缩系数的变化，以及巷道断面形状，调节风窗开口形状和位置对风流流场的影响，计算结果都小于实际值，且相差很大。
In this paper, the local resistance of trapezoidal two-way wind tunnel is analyzed through model experiment. The results show that because the theoretical calculation formula does not take into account the change of tunnel section shrinkage coefficient and the section shape of the tunnel, The influence of flow field, the calculated results are less than the actual value, and a great difference.