科创中国

Simulation and experimental study on optimization of combustion chamber structure in natural gas engine

• 摘要：

  In-cylinder flow and combustion characteristics of natural gas engine with bathtub combustion chamber were analyzed, two optimization schemes were proposed and performance of engine was studied when original combustion chamber and squish-injection combustion chamber were adopted. The results show that changing shape of piston head can achieve coupling between swirl and squish flow for constant compression ratio, control gas velocity near spark plug, increase mean turbulent kinetic energy, extend area of flame front and then improve combustion quality. Test was carried out at conditions of wide-open throttle and different speed to determine the effect of piston geometry on the performance and emissions. It shows that 2# chamber can accelerate speed of combustion greatly and improve power performance and fuel economy of engine. Power increases from 75 kW to 78.7 kW, fuel consumption decreases by 4.4%, HC and CO emissions decrease slightly.

• 作者：

  Liping Yang;Xiuzhen Ma;Haiguo Jing;骏 李

• 刊名：

  Zhongguo Jixie Gongcheng/China Mechanical Engineering

• 在线出版时间：

  2013-11-10