Effects of Intake Tumble Strength on Combustion Performance in SIDI Engine

WU Qiang; XU Min; YANG Jie; DONG Xue

doi:10.3969/j.issn.1001-2222.2017.03.001

Vehicle Engine ›› 2017, Vol. 0 ›› Issue (3) : 1-7. DOI: 10.3969/j.issn.1001-2222.2017.03.001

Effects of Intake Tumble Strength on Combustion Performance in SIDI Engine

WU Qiang, XU Min, YANG Jie, DONG Xue

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Abstract

Variable tumble ratios were achieved by adjusting the
crosssection area of intake manifold with different flow guide plates on
a SIDI optical engine test bench. Incylinder tumble
strength and kinetic energy were evaluated with Converge software, the crank
angle resolved flame images were recorded with a high speed color camera and
the instantaneous cylinder pressure was monitored by a combustion analyzer. The
blue and yellow flames were separated with the image processing, which
represented the CH released chemiluminescence and the soot particle radiation
respectively. The results show that with the increase of the tumble strength,
the blue flame area, burning rate and IMEP all increase. It shows a strong
correlation between the blue flame area and the heat release rate. Meanwhile,
it is indicated the soot reduces because the yellow flame decrease. Besides,
higher tumble ratio can suppress cycletocycle variation.

Key words

tumble ratio / optical engine / burning rate / soot;cycle to cycle variation

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WU Qiang, XU Min, YANG Jie, DONG Xue. Effects of Intake Tumble Strength on Combustion Performance in SIDI Engine[J]. Vehicle Engine. 2017, 0(3): 1-7 https://doi.org/10.3969/j.issn.1001-2222.2017.03.001