我要参会 观看直播 免费观展
学术会议
增强湍流提高天然气稀薄燃烧稳定的可视化研究
李金光 杨鹏晖 张韧 潘家营* 卫海桥 陈林

分会场

高效清洁燃烧

摘要

In the global background of “Carbon Peak” and “Carbon Neutral”, natural gas shows a great advantage in energy-saving and pollution reduction. However, it suffers from lean combustion instabilities when applied to internal combustion engines. In this paper, the effect of turbulence enhancement on improving lean combustion performance of natural gas was investigated in an optical SI engine with high compression ratios. A variable swirl valve was designed and combined with intake tumble to achieve various turbulent flow and turbulent intensity. Particle image velocimetry (PIV) was employed to measure in-cylinder turbulent flow and high-speed photography was employed to capture combustion evolutions. The results show that in-cylinder turbulent intensity is enhanced as swirl is increased. There is little variation in the sensitivity of IMEP to spark timing, but the increase of combined-turbulence will greatly increase flame propagation speed and improve thermal efficiency. The analysis of flame images shows that turbulence intensity gradually increases in the radial orientation from the spark plug to the cylinder wall, which leads to an earlier flame kernel and a faster burning rate. This combined-turbulence can reduce the cyclic variations of early flame development and optimize the whole combustion process.

关键词

复合湍流;稀薄燃烧;早期火核;火焰速度;涡流比

电子U盘全文仅限大会已缴费参会代表下载。

您还没有登录,请您先 点击这里登录

第二届世界内燃机大会

The 2nd World Congress on Internal Combustion Engines
大会筹备办Preparatory Office of the Congress
caiyuchen@csice.org.cn
021-31310189
学术交流Acaademic Exchange
liufang@csice.org.cn
021-31310973
招展招商Investment Promotion
expo@csice.org.cn
021-31310107
微信公众号
Copyright © 2020 wice.csice.org.cn All Rights Reserved 中国内燃机学会 ©版权所有 | 沪ICP备12048031号