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New seeding methodology for gas concentration measurements.

Qing N Chan1, Paul R Medwell, Bassam B Dally

  • 1Centre for Energy Technology, School of Mechanical Engineering, The University of Adelaide, SA, Australia. shaun.chan@adelaide.edu.au

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Summary

This study demonstrates pulsed laser ablation for seeding laminar jets, enabling scalar field measurements. This technique shows promise for studying mixing phenomena in gaseous flows.

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Area of Science:

  • Fluid Dynamics
  • Laser-Induced Processes
  • Optical Measurement Techniques

Background:

  • Scalar field measurements in laminar jets are crucial for understanding mixing dynamics.
  • Traditional seeding methods can perturb flow fields or lack stability.
  • A novel, non-intrusive seeding technique is needed for accurate scalar measurements.

Purpose of the Study:

  • To demonstrate the efficacy of pulsed laser ablation for seeding laminar non-reacting gaseous jets at atmospheric pressure.
  • To evaluate the stability and survival time of ablated seeding particles within the jet.
  • To assess the potential of this technique for scalar field measurements in mixing studies.

Main Methods:

  • Utilized a pulsed Nd:YAG laser (second harmonic) to ablate a neutral indium rod.
  • Introduced ablated indium atoms as scalar field markers in a laminar gaseous jet.
  • Employed planar laser-induced fluorescence (PLIF) with indium and laser nephelometry for measurements.

Main Results:

  • Demonstrated the successful seeding of a laminar jet using pulsed laser ablation.
  • Observed stability of neutral indium atoms, surviving tens of seconds before interrogation.
  • Achieved reasonable agreement between PLIF and laser nephelometry measurements.

Conclusions:

  • Pulsed laser ablation is a viable technique for seeding gaseous jets.
  • The method provides stable seeding particles suitable for scalar measurements.
  • This approach holds significant potential for advancing scalar measurements in mixing studies.