Investigation on ignition chamber performance in a methanol-fueled TJI-HPDI engine: Synergy of nozzle structure, swirl ratio, and spray angle

Peng Wang, Wuqiang Long, Bin Pang, Xiaoying Xu, Shiying Liu, Jun Wang, Xuelu Zhang, Pengbo Dong and Yang Wang

Energy, 2025, vol. 330, issue C

Abstract: Parameters of ignition chamber (IC) in a jet control compression ignition (JCCI) and methanol-fueled engine significantly influence combustion performance and indicated thermal efficiency (ITE). This study employs numerical simulations to investigate airflow and spray interactions, influencing IC performance in a Turbulent Jet Ignition (TJI) - High Pressure Direct Injection (HPDI) methanol engine. Different IC nozzle structure, namely Modified Outlet Position (MOP) and Fixed Outlet Position (FOP) modes, are compared. Results indicate that FOP mode enhances IC stability by generating divergent velocity vectors through swirling holes, effectively balancing airflow momentum and establishing reliable pathways. Moreover, proper alignment between spray angle and airflow pathways proves crucial, and optimal spray angles enrich the mixture near the spark, thus improving ignition quality and lowering emissions. Additionally, increasing the swirl ratio (SR) in the main chamber (MC) from 0 to 3 enhances airflow momentum into the IC, raising the IC-MC pressure difference by 67.5 %, and enhancing sensitivity to nozzle structure variations. Although it leads to slightly increased THC emissions, optimized airflow structures, high turbulence intensity, and aligned spray angles further elevate the pressure difference by 57.5 %, enhance the ITE by 0.5 %, and reduce carbon emissions by 0.49 %. The findings offer critical theoretical insights for optimizing IC performance in methanol engines.

Keywords: Methanol engine; Methanol direct injection; Turbulence jet ignition; Ignition chamber; IC flow field (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:330:y:2025:i:c:s036054422502599x

DOI: 10.1016/j.energy.2025.136957

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