电热塞辅助氨氢混合燃料着火的数值分析  

Numerical Analysis of Ignition Assisted by Glow Plug in Ammonia-Hydrogen Mixed Fuel

作　　者：余良可 张尚琳 张勇 YU Liang-ke;ZHANG Shang-lin;ZHANG Yong(School of Automotive Engineering,Yellow River Traffic College,Jiaozuo 454000,China)

机构地区：[1]黄河交通学院汽车工程学院,河南焦作454000

出　　处：《山东工业技术》2024年第6期90-96,共7页Journal of Shandong Industrial Technology

摘　　要：电热塞辅助压燃作为一项先进的发动机技术促进了低十六烷值燃料在压燃式发动机中的应用。本文基于CONVERGE仿真软件数值分析了电加热塞对氨氢混合燃料的着火影响。通过构建一个三维定容燃烧室模型,详细讨论了不同环境温度、加热塞热表面温度和加热塞安装位置对氨氢混合燃料喷射着火的影响机制。模拟结果证明安装加热塞有助于拓宽氨-氢混合燃料的可燃性极限。随着电热塞热表面温度从1200 K升高到1600 K,更有利于燃烧室内的初始着火点形成,着火延迟时间缩短约92%,此时扩散燃烧比例增加、放热速率降低。加热塞位置距离喷射器越远,燃料与高温热表面接触时间更长,此时初始着火点的形成越靠后、着火延迟时间增长,但放热率升高。Glow plug-assisted compression ignition,as an advanced engine strategy,promotes the application of low cetane number fuels in compression ignition engines.This paper numerically analyzes the impact of the glow plug on the ignition of ammonia-hydrogen mixed fuel based on CONVERGE simulation software.By constructing a three-dimensional constant volume combustion chamber model,the influence mechanisms of different ambient temperatures,glow plug hot surface temperatures,and glow plug installation positions on the ignition of ammonia-hydrogen mixed fuel injections are discussed in detail.Simulation results show that the installation of a glow plug helps to broaden the flammability limits of ammonia-hydrogen mixed fuel.As the hot surface temperature of the glow plug increases,the formation of initial ignition points in the combustion chamber is enhanced,the ignition delay time is shortened,the proportion of diffusion combustion increases,and the heat release rate decreases.The farther the glow plug is positioned from the injector,the later the formation of the initial ignition point,resulting in a longer ignition delay time but a higher heat release rate.A glow plug located at the bottom stays in contact with high-concentration fuel for a longer time,thereby enhancing the subsequent combustion rate.

关 键 词：电热塞辅助压燃 氨-氢混合燃料 热表面温度 定容燃烧室 数值分析 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]