In-Cylinder Flow and Boundary Layer in Gasoline Engines During Induction Process

被引：0

作者：

Liu D. ^{[1
]}

Li W. ^{[2
]}

Wang T. ^{[3
]}

Tian F. ^{[3
]}

Zhen X. ^{[1
]}

机构：

[1] School of Automobile and Transportation, Tianjin University of Technology and Education, Tianjin

[2] Engine R& D Center, Weichai Power Company Limited, Weifang

[3] State Key Laboratory of Engines, Tianjin University, Tianjin

来源：

Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2021年 / 39卷 / 03期

关键词：

Gasoline engines; Intake jet; Near-wall flow; Proper orthogonal decomposition;

D O I：

10.16236/j.cnki.nrjxb.202103031

中图分类号：

学科分类号：

摘要：

The improved delayed-DES(IDDES)model was applied to numerically simulate the in-cylinder flow of a gasoline engine during the induction process. The improvement of the wall model enhanced the reliability of the near-wall flow simulation. The simulation results were verified by micro-PIV experimental data for the near-wall flow. The dimensionless velocity distribution near the wall in the area affected by the intake jet was studied. The energy distribution of the flow fields of different scales in the cylinder and the quasi-periodic fluctuation of the instantaneous flow field near the wall were analyzed. Results show that the energy in the coherent flow field accounts for only 11% in the conditions of high valve lift and high port pressure drop, while it could reach 37% in the conditions of low valve lift and low port pressure drop conditions, which causes a significant flow field fluctuation. In addition, the intake jet swings significantly. Obvious vortex structure can be observed in the coherent flow field of the intake jet region, and the direction of rotation presents a quasi-periodic reversal. For near-wall flow, due to the influence of intake jet fluctuations, the dimensionless velocity distribution of the boundary layer in the logarithmic region bends down prematurely, deviating from the logarithmic distribution, which significantly different from the boundary layer of the steady-state channel flow. © 2021, Editorial Office of the Transaction of CSICE. All right reserved.

引用

页码：241 / 249

页数：8

共 20 条

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