黄钰,葛蕴珊,王永军,魏丕勇,刘小平,孟云霞.涡轮增压直喷汽油机缸内流场、混合气形成和燃烧数值模拟及试验[J].内燃机工程,2017,38(4):7-10.
涡轮增压直喷汽油机缸内流场、混合气形成和燃烧数值模拟及试验
Numerical Simulation and Experiment of the Flow Field, Mixture Formation and Combustion Process in the Cylinder of a Turbocharged Direct Injection Gasoline Engine
DOI：
关键词:内燃机  缸内直喷  缸内流场  喷射雾化  数值模拟
Key Words:IC engine  gasoline direct injection（GDI）  flow field  spray  numerical simulation
基金项目:
作者单位
黄钰,葛蕴珊,王永军,魏丕勇,刘小平,孟云霞 1.北京汽车集团有限公司 博士后工作站,北京 102206；2.北京理工大学,北京 100081 
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摘要:建立了发动机3D模型,在发动机进气道上采用了一个滚流控制阀片,以控制发动机气流运动。通过计算流体力学（CFD）软件计算缸内流场随曲轴转角的演变和发展过程,评估了缸内的滚流运动和湍动能。模拟了在当量空燃比条件下缸内混合气的浓度场分布,分析了缸内燃烧过程。研究结果表明：采用滚流控制阀在2000r/min、0.2MPa和1750r/min全负荷工况下能够有效提升缸内滚流比,并且在压缩行程末期增强了湍动能,有助于提升燃烧速率,改善燃烧。通过设计特殊形式的活塞顶面,对喷雾进行引导,避免了燃油喷雾直接碰撞在缸壁。燃烧模拟的缸内压力曲线与实际发动机台架测试的结果吻合性较好。
Abstract:Using the 3D engine model a tumble control valve was installed in the intake port to provide a means for controlling the engine airflow motion. Based on a CFD software, the evolution and development of the cylinder flow field with the change of crank angle were calculated, the tumble motion and turbulent kinetic energy were assessed, the spray atomization process and mixture concentration distribution were simulated under the condition of equivalent air/fuel ratio, and the combustion process was analyzed. Results show that use of tumble control valve can effectively improve the cylinder tumble ratio, and enhance the turbulent kinetic energy, allowing to improve the combustion rate and combustion process at the condition of 0.2MPa at 2000r/min and full load at 1750r/min. Moreover, a special design of piston top shape was used to prevent the spray wall impingements. These improvements make the simulated cylinder combustion pressure curves and the actual engine bench test results have a good consistency.
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