A repetitive pulsed electrothermal plasma jet ignition system based on capillary discharge

Area of Science:

• Engineering
• Plasma Physics
• Combustion Science

Background:

• Plasma ignition and combustion enhancement offer significant potential for engines, industrial burners, and emissions control.
• Developing efficient and compact plasma ignition systems is crucial for these applications.

Purpose of the Study:

• To present a new repetitive electrothermal plasma jet ignition system.
• To investigate the effects of key parameters on system performance.
• To achieve optimized and miniaturized plasma ignition.

Main Methods:

• The study utilizes an ablated capillary discharge system operating at atmospheric pressure.
• It involves a pulse current circuit, pulse voltage circuit, current release unit, and LC series resonant circuit.
• System performance was evaluated by varying energy storage capacitor voltage and current release unit resistance.

Main Results:

• Increasing capacitor voltage reduced discharge delay and improved energy deposition efficiency.
• Higher resistance in the current release unit increased discharge delay and energy deposition efficiency.
• Optimized parameters yielded a 66 µs discharge delay, 84% energy deposition efficiency, 23 MW/m² peak radiative heat flux, and 17 cm jet length.
• Repetitive discharge at 20 Hz was achieved with low voltage and efficiency dispersion (0.3% and 9.6%).

Conclusions:

• The developed plasma jet ignition system demonstrates efficient and repetitive operation at atmospheric pressure.
• Simplified circuit design facilitates system miniaturization.
• The system shows promise for various combustion enhancement applications.