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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
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Control device for improving swirl flame stabilization.

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    |December 7, 2023
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    Summary

    An active control system was developed to stabilize unstable swirling turbulent premixed flames. Adjusting the swirler vane angle effectively controlled flame shape and stabilization, offering tools for gas turbine combustors.

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    Area of Science:

    • Combustion science and turbulent flow dynamics.
    • Aerodynamics and fluid mechanics.
    • Control systems engineering.

    Background:

    • Swirling turbulent premixed flames are prone to instability, posing challenges for efficient combustion.
    • Stabilizing these flames is crucial for applications like gas turbine combustors.
    • Existing methods may lack active control for dynamic flame stabilization.

    Purpose of the Study:

    • To develop and test an actively controlled swirler system for improving the stabilization of unstable swirling turbulent premixed flames.
    • To investigate the effects of dynamic swirler vane angle adjustments on flame structure and stability.
    • To provide a robust tool for enhancing flame stabilization in gas turbine combustors.

    Main Methods:

    • Implementation of an actively controlled swirler with electrical hardware and control software.
    • Utilizing stereoscopic particle image velocimetry (PIV) to measure swirl number and analyze flame stabilization.
    • Conducting experiments with methane-air mixtures at a specific bulk flow velocity and equivalence ratio.

    Main Results:

    • Increasing swirler vane angle from 30° to 60° enhanced swirl number, creating a recirculation zone and stabilizing an M-shaped flame.
    • Reducing the vane angle back to 30° maintained a sufficient swirl number, resulting in a stable V-shaped flame.
    • The active control system demonstrated effective control over flame stabilization through dynamic vane angle adjustments.

    Conclusions:

    • The developed active control apparatus and method significantly improve the stabilization of swirling turbulent premixed flames.
    • The study provides a robust technique for enhancing flame stability, applicable to gas turbine combustor design.
    • Dynamic control of swirler vane angles offers a promising approach for managing flame behavior in combustion systems.