柴油机全可变配气缸内流场三维仿真分析  

Three-dimensional simulation of the in-cylinder flow field of fully variable valve diesel engines

作　　者：路勇[1] 潘振嘉 李建 李博[1] 王正祎 LU Yong;PAN Zhenjia;LI Jian;LI Bo;WANG Zhengyi(College of Power and Engineering University,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2020年第4期541-548,共8页Journal of Harbin Engineering University

基　　金：国家重点研发计划项目(2016YFE0108300);国家自然科学基金项目(51979059,51579050);黑龙江省科学基金项目(LC2015018).

摘　　要：为了改善柴油机动力性、提高经济性并降低排放,本文采用全可变配气技术实现了气阀配气参数的柔性调节,突破了传统柴油机凸轮型线的限制。基于中高速柴油机的气缸结构和进排气系统,使用SolidWorks软件建立柴油机气道-气阀-气缸精确模型,通过ICEM CFD软件实现高质量、速度快的动态层网格。改变进气阀开启、关闭相位和最大升程,使用FLUENT流体计算软件开展可变配气参数下的缸内流动性能CFD仿真研究。仿真结果揭示了缸内流场在不同配气参数下的发展变化规律,为中高速柴油机全可变配气参数优化和控制提供理论基础。To improve diesel engine power, increase economy, and reduce emissions, this thesis used fully variable valve technology to achieve flexible valve parameter adjustment. Such technology overcomes the limitation of traditional diesel cam profiles. On the basis of the cylindrical structure and the intake and exhaust systems of medium- and high-speed diesel engines, SolidWorks software was used to establish an accurate diesel port-valve-cylinder model, thus deriving a high-quality, fast, dynamic layer grid via ICEM CFD. Through the fluid calculation software FLUENT, the intake valve's opening phase, closing phase, and maximum lift were changed to conduct a CFD simulation study of its in-cylinder flow performance under variable valve parameters. Simulation results revealed the development and variation of the in-cylinder flow field under different parameters, thereby providing a theoretical basis for the optimization and control of the fully variable valve parameters of medium- and high-speed diesel engines.

关 键 词：柴油机 全可变配气 缸内流场 三维仿真 网格划分 气门升程 挤流 涡流比 湍动能 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]