期刊
COMBUSTION AND FLAME
卷 159, 期 4, 页码 1687-1692出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2011.12.013
关键词
Gasoline direct injection engine; Particle nucleation; Electrical charge; DMA; SERS
类别
资金
- MiUR [RBIP069JBE_003]
While nuclei particles are found in vehicle emissions in low mass concentration, they are being studied since their number concentration may be high and they may contribute to the surface composition of larger particles and health effects associated with pollution. In this work, we obtain information on where particles emitted by an engine were formed/grown. This is done by comparing the measured particle charge fraction distributions to those calculated with Boltzmann theory for the different temperatures relevant to the combustion chamber, exhaust and sampling systems. We have applied this method to analyze the exhaust of a gasoline direct injection engine. Solid core particles with a size of 1-5 nm may be formed at high temperature in the combustion chamber and semivolatile species condense on their surface as the exhaust cools in the tail pipe, in low dilution conditions. Off-line measurements, using Surface Enhanced Raman Spectroscopy (SERS) show that the sampled particles have SERS spectra with typical D and G bands of disordered amorphous carbon similar to those measured for flame-generated nanoparticles. (C) 2011 Published by Elsevier Inc. on behalf of The Combustion Institute.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据