Analysis of In-Cylinder Flow Field, Spray and
Combustion for Optical Engine

doi:10.3969/j.issn.1001-2222.2025.05.002

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (5) : 13. DOI: 10.3969/j.issn.1001-2222.2025.05.002

Analysis of In-Cylinder Flow Field, Spray and Combustion for Optical Engine

SHI Guoyong^1,2，HUANG Yong^1,2，YANG Li^1,2，WANG Guodong^1,2，YAO Bowei^1,2，MO Yu^1,2

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Abstract

In order to study the in-cylinder flow field, spray and combustion of gasoline direct injection (GDI) engine and provide a basis for the subsequent design, development and optimization of gasoline engine, the in-cylinder flow field, spray and combustion of a single cylinder optical engine were measured by particle image velocimetry （PIV）, Mie scattering method and high speed photography. The results show that the in-cylinder flow field gradually forms a more complete rolling flow with the increase of speed. As the piston goes up, the high-speed area of in-cylinder flow field shifts to the right. In the process of compression, the piston top has obvious influence on the in-cylinder flow field, and the speed loss and flow field damage are serious. At low speeds and low loads, the injected fuel vaporizes and collapses into a mist without visible multibundle beams, and the overall beam mist is noticeable due to the low ambient pressure. With the increase of speed and load, a large number of fuel droplets accumulate on the right side under the action of flow field after fuel injection, which may lead to oil dilution and pool fire phenomenon. By adjusting the fuel beam position of injector, the combustion duration significantly shortens, and the IMEP remains stable and consistent, which improves the combustion stability.

Key words

optical engine

/ flow field / spray / combustion / visualization

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SHI Guoyong, HUANG Yong, YANG Li, WANG Guodong, YAO Bowei, MO Yu. Analysis of In-Cylinder Flow Field, Spray and Combustion for Optical Engine[J]. Vehicle Engine. 2025, 0(5): 13 https://doi.org/10.3969/j.issn.1001-2222.2025.05.002