Jody Wormhoudt, David Nelson, and Kurt Annen Center for Energy and Propulsion Technology Aerodyne Research, Inc. Randy Locke ASRC Aerospace Corporation,

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Presentation transcript:

Jody Wormhoudt, David Nelson, and Kurt Annen Center for Energy and Propulsion Technology Aerodyne Research, Inc. Randy Locke ASRC Aerospace Corporation, and Mark Wernet NASA Glenn Research Center, Cleveland, OH Aerodyne Resarch, Inc. 45 Manning Road Billerica, MA NASA Contract NNC08CA36C: High Speed Temperature Analysis Software and Support for Temporally-Resolved Laser Raman Temperature Measurements in Supersonic Jet Flows Real-time Analysis of Raman Spectra for Temperature Field Characterization in Aircraft Exhaust Noise Studies or ARTware: Analysis for Raman Temperatures

Fundamental Aeronautics Program Needs Airport Noise and Supersonic Cruise Efficiency Velocity measurements previously used at NASA GRC to characterize both hot and cold jet flows and refine turbulence models/codes used to predict jet noise NASA now requires non-intrusive temperature measurements in these hot and cold high speed jet flows Measurements required to determine mean temperatures and RMS temperature fluctuations, compare to velocity fluctuations Multi-point measurements for space-time correlations of jet temperature Needed: new data reduction software, with different techniques depending on temperature range, composition, time resolution Low spectral resolution: Vibrational Moderate Spectral resolution: Unresolved Rotational High spectral resolution: Resolved Rotational

Raman Diagnostics for the Small Hot Jet Acoustic Rig in the Aero-Acoustic Propulsion Laboratory Two-Point Measurement Configuration

What’s New and Different About ARTware? Analyzing acquired spectral files for temperature and density – no. (Analysis by fitting to first-principles models) Setting up detectors (cameras) and controlling acquisition of spectra – no. Real-time display of Raman spectra and derived temperatures – yes! Aerodyne has decades of experience in tunable infrared laser spectrometers and has developed very sophisticated real-time control and analysis software for them – because real-time monitoring is often critical to success

Analysis Example Ratio of Stokes/Anti-Stokes Vibrational Intensities

Analysis Example Unresolved Rotational Band Shape

Analysis Example Resolved Rotational Band Shape (S Branches)

ARTware: A Swiss Army Knife Twelve Blades and Room for More! 3 Analysis Techniques Ratio of Stokes/Anti-Stokes Vibrational Intensities Unresolved Rotational Band Shape Resolved Rotational Band Shape 2 Models of Cameras Controlled/Read 2 Analysis Options: Real-Time or Archival Spectral File Formats:.bmp or.fits or ASCII Multiple Gratings Supported per Method All Analysis Based on Detailed Physical Model

Analysis Example: Temperature vs. Time Data Set Moves Radially Out and Axially Downstream