Quantitative Measurements of Ablation-Products Transport for Turbulence Model Validation

Metadata Updated: May 2, 2019

In recent years NASA has developed renewed interest in the study of ablation owing to the need to develop suitable thermal protection systems for spacecraft that undergo planetary entry. Ablation is a complex multi-physics process, and codes that predict it require a number of coupled submodels, each of which requires validation. For example, Reynolds-averaged Navier Stokes (RANS) and large-eddy simulation (LES) codes require models of the turbulent transport of ablation products under variable compressibility and pressure gradient conditions; however, suitable scalar-velocity data under relevant conditions are very rare. One means of obtaining such data is to transpire a gas, such as NO, into a turbulent boundary layer and to measure its dispersion with a technique such as planar laser-induced fluorescence (PLIF). Alternatively, a new technique has been developed at The University of Texas at Austin that uses PLIF of a low-temperature sublimating ablator (naphthalene) to enable visualization of the ablation products in a hypersonic turbulent boundary layer. However, for either the transpired gas or low-temperature ablation techniques to be useful, their fluorescence signals must first be studied over the wide range of pressures and temperatures that may be present in a given wind tunnel. Fluorescence models of NO and naphthalene vapor will be obtained by monitoring the fluorescence signals of these species in a pressure and temperature controlled test cell. The goal of this project is to conduct the fundamental spectroscopic measurements that are required to enable the acquisition of quantitative images of the transport of the ablation products of a re-entry vehicle model in a supersonic wind tunnel. The proposed work will mainly be conducted at research laboratories on the campus of the University of Texas at Austin under the supervision of Dr. Noel Clemens. This work will complement the NO PLIF work being conducted in the Mach 10 wind tunnel at NASA's Langley Research Center, since recent work has demonstrated problems with making the measurements quantitative. This proposal relates directly to sections 14.3.1 (Entry and Ascent TPS) and 9.1.1 (Rigid TPS) of NASA's Space Technology Roadmaps Technology Area Breakdown Structure.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_4315
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Datagov Dedupe Retained 20190501230127
Harvest Object Id 477bbcde-b1fe-47f9-9fc6-fb65ceafa530
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2015-08-01
Homepage URL https://techport.nasa.gov/view/4315
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 2b8690d8fa403b8402ee655e74fa65101395da1c
Source Schema Version 1.1

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