科创中国

Study on combustion characteristics of gasoline direct injection engine

• 摘要：

  The combustion characteristics of a 2.0 L gasoline direct injection (GDI) engine were studied at the engine's medium and low speeds and part load operation conditions, and compared with that of PFI engine. The effects of port tumble ratio on GDI engine's combustion characteristics were also analyzed. The results show that, with the same engine compression ratio and operation condition of 2000 r/min, 0.2 MPa brake mean efficient pressure, the combustion velocity of GDI engine is slower than that of PFI engine. At the engine's medium and low speeds, increasing inlet port tumble ratio can enhance airflow intensity and combustion velocity. However, when engine speed increases to 3 000 r/min, big tumble ratio deteriorates combustion in cylinder. The flap added to the inlet port can increase the air flow velocity and the combustion process of the fuel air mixture at engine low speed conditions, so that improve the engine's low speed thermal efficiency. The CFD results of 2000 r/min, 0.2 MPa BMEP condition show that closing the inlet flap can intensify the in cylinder air flow and increase the uniformity of fuel air mixture.

• 作者：

  骏 李;Yanfeng Gong;Wei Li;Hai'e Chen;Jinyu Liu;Jincheng Li;Kang Li;Huili Dou

• 刊名：

  Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University

• 在线出版时间：

  2010-7