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Simultaneous Temperature and Pressure Measurements in Compressible Flow Using Nanosecond O2 Coherent Anti-Stokes

Aman Satija1, Robert P Lucht1

  • 1School of Mechanical Engineering, 8522Purdue University, West Lafayette, IN, USA.

Applied Spectroscopy
|February 25, 2022
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Summary
This summary is machine-generated.

Simultaneous pure-rotational coherent anti-Stokes Raman spectroscopy (PRCARS) and vibrational O2 CARS spectroscopy (VCARS) simultaneously measured temperature and pressure in non-reacting compressible flow. This dual-pump CARS technique offers precise diagnostics for flow conditions.

Keywords:
CARSCoherent anti-Stokes Raman spectroscopyRaman diagnosticscombined CARS systemcompressible flow diagnosticsoxygen CARS

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Area of Science:

  • Applied Physics
  • Spectroscopy
  • Fluid Dynamics

Background:

  • Accurate measurement of temperature and pressure is crucial for understanding compressible flow dynamics.
  • Coherent anti-Stokes Raman spectroscopy (CARS) is a powerful laser-based diagnostic technique.

Purpose of the Study:

  • To simultaneously measure temperature and pressure in non-reacting compressible flow using dual-pump CARS.
  • To investigate the application of pure-rotational CARS (PRCARS) and vibrational O2 CARS (VCARS) for flow diagnostics.
  • To compare different collisional narrowing models for spectral fitting.

Main Methods:

  • Simultaneous PRCARS and VCARS measurements were performed using a three-laser, three-color dual-pump CARS configuration.
  • Experiments were conducted in an under-expanded jet flow field.
  • Numerical analysis was used to assess the pressure sensitivity of the technique.

Main Results:

  • PRCARS demonstrated high sensitivity to temperature, especially at lower temperatures.
  • Pressure was accurately determined by analyzing the differential collisional effects in PRCARS and VCARS spectra.
  • Comparison of spectral fitting models identified the most suitable models for the experimental data.

Conclusions:

  • The combined PRCARS and VCARS technique provides simultaneous, accurate temperature and pressure measurements in compressible flows.
  • This method offers a valuable diagnostic tool for non-reacting flow characterization.
  • Understanding collisional narrowing effects is essential for precise spectral analysis.