Investigation on spray cyclic variations under idle operation of engine using optical diagnostics and statistical methods
Investigation on spray cyclic variations under idle operation of engine using optical diagnostics and statistical methods
复制标题
利用光学诊断和统计方法研究发动机怠速运行时喷雾循环变化
DOI：
10.1177/1468087420926015
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发表时间：
2020-06
影响因子：
2.5
通讯作者：
Zhang P
中科院分区：
文献类型：
--
作者：
Zhou Y;Qi W;Zhang Y;Zhang P
Under idle operations of a spark-ignition direct-injection engine, issues such as misfire, unstable combustion, and power imbalance between individual cylinders are often encountered, which worsen the fuel economy and tailpipe emissions. These undesired phenomena have close relations with cyclic variations of the fuel sprays in the cylinder. In this article, the spray cyclic variations under idle operations have been investigated at a constant volume chamber using ultraviolet/visible laser absorption/scattering imaging technique and Mie scattering optical diagnostics combined with different statistical methods such as probability presence image, intersection over union, and edge fluctuation length. The variations in spray morphology of liquid/vapor phases and vapor mass distributions have been characterized. It was found that the cyclic spray variation after the end of injection is too large to ignore, implying that this cyclic variation should be taken into consideration when matching the spray to a combustion chamber or numerical modeling. The effects of injection pressure and fuel temperature on spray cyclic variations have been quantitatively examined. The results show that the higher injection pressure or the higher fuel temperature is, the larger variation in spray morphology and vapor mass distributions was observed, indicating that adopting an appropriately lower injection pressure or lower fuel temperature is helpful to a stable ignition and combustion under idle conditions for a non-homogeneous spark-ignition direct-injection engine.
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DOI：
10.4271/2007-01-1412
发表时间：
2007-04
期刊：
--
影响因子：
--
作者：
P. Adomeit;O. Lang;S. Pischinger;Richard Aymanns;M. Graf;G. Stapf
通讯作者：
P. Adomeit;O. Lang;S. Pischinger;Richard Aymanns;M. Graf;G. Stapf
影响因子：
1.9
作者：
Yuyin Zhang;K. Nishida
通讯作者：
Yuyin Zhang;K. Nishida
DOI：
10.4271/940987
发表时间：
1994-03
期刊：
SAE transactions
影响因子：
--
作者：
Nir Ozdor;M. Dulger;E. Sher
通讯作者：
Nir Ozdor;M. Dulger;E. Sher
DOI：
10.4271/2003-01-0062
发表时间：
2003-03
期刊：
--
影响因子：
--
作者：
D. Hung;D. Chmiel;L. E. Markle
通讯作者：
D. Hung;D. Chmiel;L. E. Markle
影响因子：
2.5
作者：
L. Zigan;Jun Shi;Ivan Krotow;I. Schmitz;M. Wensing;A. Leipertz
通讯作者：
L. Zigan;Jun Shi;Ivan Krotow;I. Schmitz;M. Wensing;A. Leipertz