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为了认识排气管内的多维流动特性，提供排气管二维非定常流动计算的边界条件和考题数据，设计了１根二维的排气管模型．在柴油机倒拖时，测量了该模型排气管内６个截面的压力和速度分布的变化，研究了模型排气管内二维非定常流动．测量结果显示，同一截面不同测点的压力变化曲线非常接近；支管的速度分布曲线是不对称的，其峰随偏向支管的内壁面，进入总管后速度曲线呈偏向总管外壁面的不对称分布，随后渐渐变为对称分布．测量结果可用于排气管二维非定常流动的计算．
In order to know the multidimensional flow characteristics in the exhaust pipe and provide the boundary conditions and test data for the two-dimensional unsteady flow calculation of the exhaust pipe, a two-dimensional exhaust pipe model was designed. The pressure and velocity distribution of six sections in the exhaust pipe of the model were measured while the diesel engine was towed. The two-dimensional unsteady flow in the exhaust pipe of the model was studied. The measurement results show that the pressure curves at different measuring points of the same cross section are very close. The velocity distribution curve of the branch pipe is asymmetrical. The peak of the velocity distribution curve diverges to the asymmetrical distribution of the outer wall of the manifold after entering the manifold. Then gradually become a symmetrical distribution. The measurement results can be used to calculate the two-dimensional unsteady flow of the exhaust pipe.