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<p>Efficient air–fuel mixing is essential for achieving stable combustion, reducing emissions, and enhancing the overall performance of gas turbine combustors. This study provides a detailed computational investigation of swirling air jet mixing in confined geometries, with direct relevance to air–fuel mixing processes in gas turbine applications. The simulations employed the realizable <i>k–ε</i> turbulence model and were validated against existing experimental data, showing strong agreement. Computational investigations were performed using ANSYS Fluent in enclosures of fixed length but varying diameter, achieved by progressively introducing annular jets to form multi-annular configurations comprising 2 to 6 jets. While the central jet is conceptualized as a fuel jet and the surrounding annular jets as air, all jets are modelled as air to isolate the fundamental mixing behaviour. The introduction of additional annular jets increases the total mass flow rate, significantly influencing internal flow structures. Clear signs of improved mixing were seen in the significant increase in the central recirculation zone (CRZ) and the corresponding decrease in centreline axial velocity. To gain deeper insight into the flow behavior, each set of jet’s configurations was investigated using two different swirl intensity combinations. Findings indicated that a greater difference in swirl strength enhanced the formation of the central recirculation zone (CRZ) and reduced axial velocities along the centerline, suggesting more effective interaction and mixing between the jets.</p>

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Effect of jet configuration and swirl on mixing characteristics in confined multi-annular swirling flows

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Ritesh Srivastava,
  • Vivek Kumar Patel

摘要

Efficient air–fuel mixing is essential for achieving stable combustion, reducing emissions, and enhancing the overall performance of gas turbine combustors. This study provides a detailed computational investigation of swirling air jet mixing in confined geometries, with direct relevance to air–fuel mixing processes in gas turbine applications. The simulations employed the realizable k–ε turbulence model and were validated against existing experimental data, showing strong agreement. Computational investigations were performed using ANSYS Fluent in enclosures of fixed length but varying diameter, achieved by progressively introducing annular jets to form multi-annular configurations comprising 2 to 6 jets. While the central jet is conceptualized as a fuel jet and the surrounding annular jets as air, all jets are modelled as air to isolate the fundamental mixing behaviour. The introduction of additional annular jets increases the total mass flow rate, significantly influencing internal flow structures. Clear signs of improved mixing were seen in the significant increase in the central recirculation zone (CRZ) and the corresponding decrease in centreline axial velocity. To gain deeper insight into the flow behavior, each set of jet’s configurations was investigated using two different swirl intensity combinations. Findings indicated that a greater difference in swirl strength enhanced the formation of the central recirculation zone (CRZ) and reduced axial velocities along the centerline, suggesting more effective interaction and mixing between the jets.