涡流是影响柴油机经济性与排放特性的关键参数，在柴油机设计与改进过程一般通过气道稳态试验 台进行测量与评价。介绍了一种自动化程度较高的气道稳态试验台的设计方案，可以自动控制气门升程和试验压力，适用于生产线。论述和比较了当前常用的测量与分析方法，并在试验台上进行了相应试验研究。结果表明，即使在相同试验条件下，不同测量方法或分析方法也会有不同的结果，在对不同试验台测量结果进行比较时，需要注意由于方法不同所引起的差异。

  Swirl is a key parameter that directly influences the efficiency and exhaust property of diesel engine. And it is usually measured and valued by a steady flow test system in designing and development process. This paper firstly presented the scheme of a highly automatic steady test bench, on which the valve lift and test pressure are all computer-controlled. Then it reviewed the varied measuring and analysis methods, and performed some corresponding experiments on the bench. The experiment results show that even under the same test condition,  the results are different if using different measuring or calculating techniques, which should be noticed in the comparison.