柴油机进气门偏心对进气流动的影响分析.pdf

柴油机进气门偏心对进气流动的影响分析* 雷基林 申立中 毕玉华 贾德文 黄志平 （昆明理工大学 云南省内燃机重点实验室，昆明 650500） An analysis for the influence of the intake valve eccentricity on the air inlet flow characteristics in diesel engine Lei Jilin Shen Lizhong Bi Yuhua Jia Dewen Huang Zhiping (Yunnan Province Key Laboratory of Engines, Kunming University of Science and Technology, Kunming 650224, China) Abstract: According to the port steady-flow experiments, the numerical simulation model was built by AVL Fire software and used to analyze the helical intake port air inlet flow characteristics. Six different programs of intake valve eccentricity were designed. The influence of the intake valve eccentricity on the air inlet flow characteristics in diesel engine were analyzed with computational fluid dynamics (CFD) three-dimensional simulation method. The results indicated that the uniformity of the airflow into the cylinder and refluxing status in the valve plate area were affected directly by the position of the intake valve in the cylinder bore. The influence relationship of the intake valve eccentricity on the air inlet flow characteristics showed a certain regularity，with the increasing of the eccentric ratio of the intake valve, the average flow coefficient and the average swirl ratio were first increased and then decreased, and there was a best position area. The average flow coefficient was larger with the intake valve eccentricity in the 0.27 to 0.37 range and the average swirl ratio was larger with the intake valve eccentricity in the 0.27 to 0.48 range. 摘要：结合气道稳流模拟实验，采用 AVL Fire软件建立了螺旋进气道进气流动仿真模型。 设计了 6 个不同进气门偏离气缸中心的偏心率方案，采用计算流体动力学（CFD）三维模拟的方 法分析了柴油机进气门偏心对进气流动的影响关系。研究结果表明：进气门在气缸中的位置， 直接影响进入气缸的气流均匀性和气门盘区域的回