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Central recirculation zone induced by the DBD plasma actuation.

Gang Li^1,2, Xi Jiang³, Zhijun Lei^1,2

¹Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China.

Scientific Reports

|August 5, 2020

Summary

This summary is machine-generated.

Dielectric barrier discharge (DBD) plasma actuation successfully induced a central recirculation zone (CRZ) in a low swirl burner, demonstrating aerodynamic control for flame stabilization. This non-intrusive method offers flexible swirl enhancement in combustion systems.

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Area of Science:

Fluid Dynamics
Combustion Science
Plasma Physics

Background:

Central recirculation zones (CRZs) are crucial for flame stabilization in burners, typically generated by vane swirlers.
Dielectric barrier discharge (DBD) plasma actuation offers a novel, non-intrusive method for flow control.

Purpose of the Study:

To investigate the induction of a CRZ using DBD plasma actuation in a low swirl burner.
To elucidate the aerodynamic mechanism of plasma-induced swirl for combustion control.

Main Methods:

Experimental investigation using a low swirl burner configuration.
Implementation of three circular DBD actuators to generate circumferential ionic wind.
Flow field characterization using Laser Doppler Anemometry (LDA) in non-reacting and reacting conditions.

Main Results:

A stable, ellipsoid-shaped CRZ was successfully induced in the non-reacting flow field by DBD plasma actuation.
The upstream stagnation point of the CRZ was found to be dependent on the plasma actuation strength.
While the CRZ diminished in reacting flow, plasma actuation significantly influenced flame lift-off height.

Conclusions:

DBD plasma actuation is an effective method for inducing and controlling CRZs, primarily through aerodynamic effects.
Plasma swirl enhancement provides a flexible and non-intrusive approach for combustion control.
This technique shows promise for improving flame stability and performance in various burner configurations.