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Study of Next Generation Propulsion Systems Using Advanced High Speed Laser Diagnostics

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Technical Report

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University of Illinois Urbana United States

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This study summarizes an effort to understand the multi-scale and multi-physics phenomena in supersonic and hypersonic reactive environments relevant to the Air Force, and the development of advanced diagnostics to support this vision. Significant achievements were made in four separate, but synergistic areas. First an arc-heated hypersonic wind tunnel at the University of Illinois ACT-II was developed for experimental research in supersonic combustion. Second, a novel 2D laser diagnostics for imaging of turbulent flames using the CH CX transition has been developed and demonstrated with high SNR using low laser energies. Third, a novel nanosecond-gated laser-induced breakdown spectroscopy nano-LIBS was developed to be a practical and effective technique for quantitative gas property measurements in supersonic reactive environments. Finally, studies of combustion-induced unstart phenomena and flame stabilization in axisymmetric scramjet models were conducted in the ACT-II facility using advanced high speed measurement techniques.

Subject Categories:

  • Combustion and Ignition
  • Lasers and Masers

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