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Traditionally used to boost jet engine thrust in military applications, afterburners offer potential for further enhancement. This research explores this possibility by employing transient CFD and acoustic analysis for afterburner design optimization with a CD nozzle. While some experimental data exists for specific models, comprehensive analyses encompassing both transient behaviour and acoustics are still unexplored. The paper investigates four afterburner configurations with combustion chamber lengths ranging from 3 to 6.5 ft. SolidWorks™ software facilitates the 3D modelling process, while ANSYS®Fluent and ACTRAN™ are employed for transient CFD and acoustic analysis, respectively. The simulations utilize an unsteady-state approach incorporating the realizable k–ε turbulence model, discrete phase modelling for fuel injection, and the Finite Rate/Eddy Dissipation model for combustion. The results gleaned from the transient CFD and acoustic analysis suggest that the 5-foot combustion chamber model equipped with a convergent-divergent nozzle achieves the optimal thrust, aligning with established experimental findings.

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Optimization of Combustion Chamber Length for Afterburner Equipped with a Convergent-Divergent Nozzle Using Transient CFD and Acoustic Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Srinivasa Rao Gurrala,
  • Sanjay Singh Rawat,
  • Andavan Shaija

摘要

Traditionally used to boost jet engine thrust in military applications, afterburners offer potential for further enhancement. This research explores this possibility by employing transient CFD and acoustic analysis for afterburner design optimization with a CD nozzle. While some experimental data exists for specific models, comprehensive analyses encompassing both transient behaviour and acoustics are still unexplored. The paper investigates four afterburner configurations with combustion chamber lengths ranging from 3 to 6.5 ft. SolidWorks™ software facilitates the 3D modelling process, while ANSYS®Fluent and ACTRAN™ are employed for transient CFD and acoustic analysis, respectively. The simulations utilize an unsteady-state approach incorporating the realizable k–ε turbulence model, discrete phase modelling for fuel injection, and the Finite Rate/Eddy Dissipation model for combustion. The results gleaned from the transient CFD and acoustic analysis suggest that the 5-foot combustion chamber model equipped with a convergent-divergent nozzle achieves the optimal thrust, aligning with established experimental findings.