For four kinds of spark plugs for gasoline direct injection (GDI) engine, the simulation and computation model was established by using 3D simulation software and the incylinder turbulence in cold state at 2 000 r/min was calculated. Then the flow field distributions inside cylinder and near spark plug during the intake stroke, compression stroke and ignition timing were acquired and the velocity field and turbulent kinetic energy in the cylinder were evaluated. The results showed that the spark plug had a strong influence on the turbulent kinetic energy and incylinder velocity field at the initial stage of intake stroke, which determined the formation of initial vortex and the development of incylinder turbulence. With the closing of intake valve and the increase of cylinder volume, the effect of spark plug on turbulence became weaker. Until the piston approached the top dead center, the effect of spark plug on local flow field became obvious again. Accordingly, an appropriate spark plug structure could lead to a low velocity and sufficient turbulence strength at the ignition timing and hence ensure the ignition stability and flame fast propagation.
WANG Qinyan
,
WANG Chunmei
,
QIAN Yejian
,
ZHANG Mengyuan
,
CHI Hao
. Influence of Spark Plug on Incylinder Turbulent Flow of Gasoline Engine[J]. Vehicle Engine, 2018
, 0(2)
: 1
-8
.
DOI: 10.3969/j.issn.10012222.2018.02.001
