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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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Compact microwave re-entrant cavity applicator for plasma-assisted combustion.

Kadek W Hemawan¹, Indrek S Wichman, Tonghun Lee

¹Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan 48824, USA.

The Review of Scientific Instruments

|June 3, 2009

Summary

This study details a compact microwave/rf applicator that enhances combustion flames. Adding microwave power extends flammability limits and increases radical species, improving flame characteristics.

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Area of Science:

Plasma physics
Combustion chemistry
Microwave engineering

Background:

Microwave/radio frequency (RF) applicators can enhance combustion processes.
Understanding the interaction between electromagnetic fields and flames is crucial for improving combustion efficiency and control.

Purpose of the Study:

To design and experimentally operate a compact microwave/rf applicator.
To investigate the effects of microwave power on premixed methane/oxygen flames.
To characterize the changes in flame properties and radical species.

Main Methods:

A compact microwave/rf applicator was designed and operated at atmospheric pressure.
Electromagnetic energy was coupled into a premixed CH(4)/O(2) flame.
Optical emission spectroscopy was used to measure gas rotational temperatures.
Flame characteristics such as length, intensity, and radical species density were analyzed.

Main Results:

Addition of 2-15 W microwave power extended flammability limits for fuel-lean conditions.
Flame length, intensity, and the number density of excited radical species increased.
Downstream gas temperatures rose, with rotational temperatures measured between 2500-3600 K.
Microplasma discharges were observed at higher input powers (>= 10 W).

Conclusions:

The microwave/rf applicator effectively enhances premixed CH(4)/O(2) flames.
Microwave augmentation leads to improved flame stability, intensity, and radical production.
The findings suggest potential for advanced combustion control and plasma-assisted combustion applications.