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Experimental study on jet ignition and combustion processes of natural gas

机译：喷射点火和天然气燃烧过程的实验研究

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摘要

Pre-chamber-type ignition system can provide multiple ignition points, high ignition energy and strong turbulent disturbance, which are beneficial for the ignition and flame propagation of natural gas engines especially in lean-burn mode. The impacts of pre-chamber geometric parameters and premixed gas parameters on ignition and the consequent combustion processes were investigated with optical diagnostics in combination with pressure acquisition in a constant volume chamber. Experimental results showed that a larger pre-chamber orifice diameter caused earlier ignition timing and lower ignition position. When the ignition position was at the center of the main chamber, the flame propagation rate of the mixture and the pressure rise rate in the main chamber reached their highest values. The flame would quench when the orifice diameter was smaller than a certain value. Increasing the volume of the pre-chamber led to a retarded appearance timing of the jet in the main chamber, however, more combusting mixture and wider distribution range could provide higher ignition energy, resulted in a higher combustion rate. When the fuel/air equivalence ratio was increased in the pre-chamber, the ignition ability was enhanced and lean burn limit in the main chamber was expanded. The initial pressure and temperature of premixed gas played important roles in chemical reaction rate in the main chamber.
机译：预室型点火系统可以提供多个点火点，高点火能和强大的湍流障碍，这对诸如稀燃模式的天然气发动机的点火和火焰传播有益。在恒定容积室中的压力采集结合使用光学诊断，研究了预室几何参数和预混气体参数对点火和随后的燃烧过程的影响。实验结果表明，更大的预室孔口直径引起了早期点火正时和较低点火位置。当点火位置处于主腔室的中心时，混合物的火焰传播速率和主室中的压力上升速率达到其最高值。当孔口直径小于一定值时，火焰会淬火。增加预室的体积导致主室中射流的延迟外观定时，然而，更燃烧的混合物和更宽的分布范围可以提供更高的点火能量，导致更高的燃烧速率。当在预室中燃料/空气等效比增加时，将点火能力提高，并且在主室中膨胀烧伤极限。预混合气体的初始压力和温度在主室中的化学反应速率发挥了重要作用。

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  • 来源
    《Fuel》 |2020年第15期|116467.1-116467.12|共12页
  • 作者

    Tian Jiangping; Cui Zechuan; Ren Zhongyong; Tian Hua; Long Wuqiang;

  • 作者单位

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pre-chamber; Jet ignition; Natural gas; Visualization;

    机译：预室;喷射点火;天然气;可视化;

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