Authors:

Mo Chen

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About Paper:

Turbulent Jet Ignition (TJI) is a promising technology for improving internal combustion (IC) engine efficiency and emissions. Prior studies demonstrated a 13-15% improvement in fuel efficiency in production engines through prechamber and nozzle optimization, but also highlighted significantly increased cycle-to-cycle variation, particularly under low-load and cold-start conditions. This study investigates the root causes of combustion instability in a modified 2018 Ford Focus 1.0L engine outfitted with a custom TJI system. The engine operates at 1200 RPM while in-cylinder flame development is captured via high-speed endoscopic imaging at 2400 fps with an 800 × 600 resolution. Combustion pressure, emissions, and other key signals are acquired using an NI cRIO system and LabVIEW interface. By integrating optical and pressure diagnostics, this research examines how ignition delay, oxygen concentration, and prechamber preheating influence flame propagation and combustion variability. Each parameter set is evaluated for its effectiveness in reducing instability and improving combustion completeness. The study aims to build a detailed understanding of instability mechanisms and to inform strategies that enable robust, low- emission operation of TJI-equipped engines. Keywords: Turbulent Jet Ignition; Internal Combustion Engines; Sustainability; Combustion Stability

Source:

Purdue University / 2025

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Co-authors:

Mo Chen