本文包括如下三部分：（ｌ）评述了气道稳定流动的各种试验方法。（２）在试 验和理论分析基础上，提出了表达内燃机进气道流通能力的参数──内燃机通流能力 （μσ）Ｅ，它能把稳流试验与内燃机实测结果联系起来．且能满意地定量表达内燃机气 道的流通能力．（３）从理论上提出评价进气道综合性能的参数──综合性能指标 Ｘ；Ｘ值从能量转换效率观点，包含了进气道的流通能力参数和进气旋流参数．Ｘ可 用来比较评价各种气道． This paper consists of the following three parts: (l) Various experimental methods for stable airway flow were reviewed. (2) Based on the experimental and theoretical analysis, a parameter expressing the flow capacity of the intake passage of the internal combustion engine is proposed - the flow capacity (μσ) E of the internal combustion engine, which can link the steady flow test with the actual measured result of the internal combustion engine. And can satisfactorily express the flow capacity of the internal combustion engine airway. (3) Theoretically, the parameter to evaluate the comprehensive performance of the intake port ─ ─ comprehensive performance index X; X value from the energy conversion efficiency point of view, contains the intake flow capacity parameters and intake swirl parameters. X can be used to compare the evaluation of various airways.