张韦，包广元，彭益源，陈朝辉，蒋倩昱，宗广成.单气道柴油机气缸内近壁面流场与不同截面涡流比分析[J].内燃机工程,2020,41(5):40-47.
单气道柴油机气缸内近壁面流场与不同截面涡流比分析
Visual Measurement of Near Wall Flow Field and Swirl Ratio of Different Cross Sections in the Cylinder of Single Port Diesel Engine
DOI：10.13949/j.cnki.nrjgc.2020.05.006
关键词:螺旋进气道  近壁面流场  涡流比  油流法  稳流测试
Key Words:helical intake port  near wall flow field  swirl ratio  oil flow method  steady flow test
基金项目:国家自然科学基金项目（51665023,51666007）
作者单位
张韦，包广元，彭益源，陈朝辉，蒋倩昱，宗广成 1.昆明理工大学 云南省内燃机重点实验室，昆明 650500；2. 昆明云内动力股份有限公司，昆明 650500 
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摘要:构建单螺旋气道柴油机的气道-气门-气缸的计算机辅助设计（CAD）模型，开展油流法稳流试验及不同截面涡流比测量，并进行计算流体力学（CFD）模拟，利用试验结果验证CFD计算，分析缸内近壁面的流场及气缸不同截面涡流比的变化。结果显示：采用质量比为8:8:3的甲基硅油、油酸、铝粉的油剂配方所显示的缸内近壁面流场信息最为清晰完整；距进气口最近的气缸内近壁面形成气流高流速区，高流速区面积会随着气门开度的增大而增加，在高流速区域气缸壁面润滑油膜厚度减小，存在磨损加剧的风险。在进气过程中，随着气门开度逐渐增大，缸内的涡流比会逐级提升；随着涡流比测量面逐渐远离缸盖，各测量面的涡流比逐渐降低。
Abstract:Using a computer aided design(CAD) model developed for the port valve cylinder of a single helical port diesel engine, a visual port steady flow test of the oil flow method and a swirl ratio measurement of different cross sections were carried out. At the same time, the CAD model was imported into a computational fluid dynamics(CFD) software to cross validate the numerical simulation using these experimental results, and the changes of in cylinder near wall flow field and the swirl ratio of different cross sections were analyzed. Results show that the formula of methyl silicone oil, oleic acid and aluminum power with a mass ratio of 8:8:3 can provide a very clear and complete information for the in cylinder near wall flow field. As observed, at the cylinder wall closest to the cylinder inlet, there is a high speed airflow area that expands with the increase of valve opening, promoting the thinning of oil film on the cylinder wall, which poses a great risk to the safe operation of cylinder and piston. Moreover, during the intake process, the in cylinder swirl ratio strengthens as the valve opening increases, and gradually decreases as the measurement position moves away from the cylinder head.
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