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PIV and Rotational Raman-Based Temperature Measurements for CFD Validation in a Single Injector Cooling FlowNASA's Turbulent Heat Flux (THX) task under the Transformational Tools & Technologies project is focused on acquiring benchmark temperature and velocity data in turbulent shear layers for validation of computational fluid dynamics (CFD) codes. Standard CFD turbulence models lack the ability to accurately calculate a number of fundamental flow phenomena, including the turbulent transport of heat. In nearly all production class Reynolds-averaged Navier-Stokes (RANS) CFD codes, a gradient-diffusion approximation is used whereby a constant turbulent Prantdl number, Prt, is used to relate an eddy viscosity calculated for the momentum terms, to the turbulent heat flux terms. The default in most CFD codes is Prt = 0.9, however this is not representative of all flows. As discussed in Yoder et al. (2015) and Reynolds (1974), Prt = 0.7 is felt to be more appropriate for jets. Recent work, as discussed in Yoder (2016a), has explored more complex formulations including variable turbulent Prantdl number models.



PARTICLE IMAGE VELOCIMETRY; TEMPERATURE MEASURING INSTRUMENTS; FILM COOLING; HIGH TEMPERATURE GASES; COMPUTATIONAL FLUID DYNAMICS; PREDICTION ANALYSIS TECHNIQUES; TURBULENCE MODELS; RAMAN SPECTRA; VELOCITY; MACH NUMBER; GAS TURBINE ENGINES; NOZZLE FLOW; THERMOCOUPLES; LASER INDUCED FLUORESCENCE; COOLING FLOWS (ASTROPHYSICS); RAMAN SPECTROSCOPY; HEAT FLUX
Document ID
20190030814
Document Type
Technical Memorandum (TM)
Authors
Wernet, Mark P.
(NASA Glenn Research Center Cleveland, OH, United States)
Georgiadis, Nicholas J.
(NASA Glenn Research Center Cleveland, OH, United States)
Locke, Randy J.
(Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
September 16, 2019
Publication Date
January 1, 2018
Subject Category
Statistics And Probability
Fluid Mechanics And Thermodynamics
Instrumentation And Photography
Report/Patent Number
NASA/TM-2018-219739 (Corrected Copy)
GRC-E-DAA-TN72801
E-19459-1
Funding Number(s)
WBS: 109492.02.03.01.01.01
CONTRACT_GRANT: NNC12BA01B
Distribution Limits
Public
Copyright
Public Use Permitted.

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