Li, W.; Ma, J.; Zhu, T.; Wei, H.; Pan, J. Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines. Appl. Sci.2023, 13, 9468.
Li, W.; Ma, J.; Zhu, T.; Wei, H.; Pan, J. Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines. Appl. Sci. 2023, 13, 9468.
Li, W.; Ma, J.; Zhu, T.; Wei, H.; Pan, J. Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines. Appl. Sci.2023, 13, 9468.
Li, W.; Ma, J.; Zhu, T.; Wei, H.; Pan, J. Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines. Appl. Sci. 2023, 13, 9468.
Abstract
The pre-chamber technologies can improve the ignition performance of IC engines by more than two orders in magnitude and thereby substantial economic benefits. Compared with the common pre-chamber, a plug-and-play passive scheme is suitable for quick retrofit, which is getting more attention from the automobile industry. Good scavenging is the precondition for improving turbulent jet ignition performance for a passive pre-chamber. Therefore, detailed evaluations of the scavenging process and turbulent jet ignition deserve investigations for new pre-chamber schemes. In this paper, the effects of design parameters on ignition processes of plug-and-play passive pre-chamber were numerically studied, allowing for the lateral angle, orifice diameter, and vertical angle design. Seven pre-chamber schemes were evaluated, and four optimal ones were selected for bench tests. The characteristics of the scavenging process, turbulent jet ignition, and main-chamber combustion were investigated and analyzed. The results show that allowing for the trade-off between ignition energy and scavenging efficiency, the volume ratio of the pre-chamber to clearance is recommended to be 0.2~0.7%, and the corresponding area-volume ratio is 0.003~0.006 mm-1. Compared with the original natural gas engine, the pre-chamber retrofit can save up to 13.2% fuel consumption, which presents a significant improvement in fuel economy.
Keywords
Natural gas engine; Turbulent jet ignition; Pre-chamber; Scavenging; Fuel consumption
Subject
Engineering, Energy and Fuel Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
