点火位置对射流点火发动机燃烧特性的影响
The Influence of Ignition Position on the Combustion Characteristics of Jet Ignition Engines
王振宇 1梁永胜 1郭骁 1刘颖 1从骁宇 1高自强 1崔华盛2
作者信息
- 1. 航天时代飞鸿技术有限公司,北京 100097
- 2. 北京理工大学机械与车辆学院,北京 100081
- 折叠
摘要
射流点火可以有效提高发动机燃烧效率,抑制爆震,预燃室内部火花塞的点火位置对于点火成功率以及燃烧效果有较大影响.采用CFD仿真的方法,研究了被动式射流点火发动机预燃室内部火花塞点火位置对发动机缸内燃烧过程的影响,得到以下结论:适当的将预燃室内火花塞点火位置靠近预燃室喷孔可借助高湍动能气体实现火焰的加速传播;在气流作用下,火焰首先向预燃室末端传播,可减少高温燃气喷射前预燃室向主燃室回流的未燃混合气,提高预燃室内混合气的累计放热量,预燃室内可燃混合气累计放热率最高可提升14.9％.
Abstract
Jet ignition can effectively improve engine combustion efficiency and suppress knock.The ignition position of the spark plug in the pre-chamber has a significant impact on the ignition success rate and combustion effect.Using CFD simulation method,the influence of the ignition position of the spark plug in the pre-chamber of a passive jet ignition engine on the combustion process in the engine cylinder was studied.The following con-clusions were obtained:appropriately placing the ignition position of the spark plug in the pre-chamber close to the nozzle can achieve accelerated flame propagation with the help of high turbulent kinetic energy gas;Under the action of airflow,the flame first propagates towards the end of the pre-chamber,which can reduce the un-burned mixture that flows back from the pre-chamber to the main combustion chamber before high-temperature gas injection,and increase the cumulative heat release of the mixture in the pre-chamber.The maximum cumula-tive heat release rate of the combustible mixture in the pre-chamber can be increased by 14.9％.
关键词
点火/预燃室/射流/发动机/燃烧Key words
Ignition/Pre-chamber/Jet/Engine/Combustion引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据