Process of Multiple Channel Gliding Arc Assisted Combustion Near Lean Blow-out Limit

Weizhen Wang,Min Jia,Wei Cui,Zhibo Zhang,L Zhang,S Defilla,W Chu

doi:10.1051/e3sconf/202123301027

Abstract

Multichannel gliding arcs actuators were designed to enhance the non-premixed combustion of the kerosene (RP-3) and air mixture in a swirl combustor near lean blow-out limit. The instantaneous voltage and current of the multichannel gliding arcs and the 1kHz high-speed CH* chemiluminescence imaging of the combustion process were simultaneously measured to show the characteristics of the process assisted by the plasma. When reaching near lean blow-out limit in a flow rate of 225 SLPM, at the combustor inlet, the emission intensity and projected flame assisted by the multichannel gliding arcs remain the same with decreased fuel flow rates from 3 to 1 ml/min, which assisted by the single gliding arc decreases nevertheless. The flame structure under the influence of plasma actuators with various channel numbers evolves differently owing to the differences in plasma distributions.

Highlights

Meeting increasingly strict air environmental standards has gradually become the focus of combustion chamber design
The investigations on the lean blow-out process are conducted by gradually decreasing the fuel flow rate at Qair=225 SLPM
The multichannel gliding arcs plasma actuator was proposed to support the combustion in the swirl combustor

Summary

Introduction

Meeting increasingly strict air environmental standards has gradually become the focus of combustion chamber design. Gao et al [21] obtained visual images of OH and CH2O regions during the gliding arc assisted combustion process. They revealed the specific mechanism of the gliding arc's enhancement of turbulent flame. Few researches studied the interaction between the multichannel arcs plasma and the swirl flame. The development of the turbulent flame assisted by the gliding arc at various equivalence ratios was investigated and recorded by a high-speed camera with a CH* filter, and the voltage and current waveform of the MGA were recorded to reveal the relation between the plasma and the assisted flame

Experiment description

Results and discussion

Conclusion