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.
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
.
DOI: 10.3969/j.issn.1001-2222.2025.05.002
