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Velocity, Temperature and Density Measurements in Supersonic Jets Prediction of the flow field properties in supersonic jets using computational fluid dynamics (CFD) codes is challenging when there is a significant temperature difference between the jet core and the ambient air and/or compressibility effects are substantial. A benchmark set of flow field property data were obtained to assess current CFD capabilities and develop better modeling approaches for these turbulent flow fields where accurate calculation of turbulent heat flux is important. Three different convergent-divergent nozzles were investigated with exit Mach numbers of: 1.36, 1.63 and 2.0 at their perfectly expanded conditions. The conditions of the jet were set to obtain a temperature difference of zero between the jet core and the ambient air, and then the temperature difference was progressively increased, at the same jet Mach number. Particle Image Velocimetry (PIV), spontaneous rotational Raman scattering spectroscopy (SRS), Background Oriented Schlieren (BOS) and probe-based measurements were used to acquire high quality, spatially-resolved measurements of the mean and root mean square (rms) velocities as well as the mean and rms gas temperatures and densities in both hot and cold supersonic jet flows. The non-intrusive flow measurements are compared both against probe measurements and against standard Reynolds averaged Navier-Stokes (RANS) predictions of the supersonic jet flow properties.
Document ID
20205007269
Document Type
Technical Memorandum (TM)
Authors
Mark P Wernet
(Glenn Research Center Cleveland, Ohio, United States)
Nicholas J Georgiadis
(Glenn Research Center Cleveland, Ohio, United States)
Randy J Locke
(HX5, LLC)
Date Acquired
September 6, 2020
Publication Date
October 27, 2020
Subject Category
Instrumentation And Photography
Report/Patent Number
E-19870
NASA/TM-20205007269
Funding Number(s)
WBS: 109492.02.03.05.01.03
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
NASA Peer Committee
Keywords
Rotational Raman Spectroscopy
Turbulent Jets
Temperature Measurement
Density Measurement
Turbulence Modeling
Long Pulse Laser
rms temperature
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