Calculation method of spherically expanding flame propagation radius to consider ignition electrode effects

Area of Science:

• Combustion science
• Fluid dynamics
• Optical diagnostics

Background:

• Accurate measurement of flame propagation spherical radius is crucial for understanding combustion dynamics.
• Ignition electrodes can introduce significant errors in flame radius measurements.
• Existing methods may not fully account for electrode-induced artifacts.

Purpose of the Study:

• To develop and validate a novel flame-radius calculation method.
• To eliminate the influence of ignition electrodes on flame propagation measurements.
• To analyze the adaptability and optimization effects of the proposed method.

Main Methods:

• Design of a new flame-radius calculation algorithm.
• Analysis of the impact of ignition electrodes on angle ratios using the Han II method.
• Evaluation of the method's performance across different flame distributions (convex and concave).

Main Results:

• The proposed method effectively eliminates ignition electrode effects.
• Significant reductions in the standard deviation (5.13-22.1%) and range (0.32-39.51%) of extracted radius values were observed.
• The method demonstrated improved accuracy for both convex and concave flame shapes, with mean radius increment rates of 0.4-3.19%.

Conclusions:

• The developed flame-radius calculation method enhances measurement accuracy by mitigating ignition electrode interference.
• The method shows robust performance across various flame geometries, particularly in mild-variation regions.
• This advancement is vital for precise combustion analysis and diagnostic applications.