关键词: 动力机械工程, 内燃机, 充气量, 流速波, 压力波, 充气效率, 测量

Abstract: A new method for determination of the charging and the volumetric efficiency of the individual cylinder in a multicylinder internal combustion engine was proposed. The method is based on the measurement of the pressure wave in the intake system of the engine and the radial distribution of the velocity of the steady turbulence flow in a section of the intake port of each cylinder. The AVL657 digital analyzer was used to measure and record the charge pressure wave in the intake system and the TSI IFA100 hot-wire/hot-film constant temperature anemometer was used to measure and record the charge velocity in the intake port. The measurements were performed under motoring condition at different engine speeds and different throttle valve openings and the chargings and the volumetric efficiencies of each cylinder were calculated under different conditions. The average volumetric efficiencies of each cylinder were compared with that of the whole engine, and the maximal deviation was 0.04. The maximal unevenness of the volumetric efficiencies inside the engine was 9.1%. By means of the proposed method, it is possible to study quantitative the unevenness of charging of individual cylinder.

Key words: power machinery and engineering, internal combustion engine, charging, velocity wave, pressure wave, volumetric efficiency, measurement