Spectrally-Resolved Laser Diagnostics for High-Enthalpy Flow Sensing
Abstract
In this proposed research, performer aims to provide a novel measurement strategy to address the strong and unmet needs for spatially- and temporally-resolved quantitative sensing of multiple gas dynamic parameters (e.g. temperature, pressure and velocity) in high-enthalpy ground test systems forhypersonic air flows.This new measurement strategy utilizes a continuous-wave (CW), spectrally-resolved laser-induced fluorescence (SR-LIF) sensing approach that enables simultaneous single- or multi-point quantification of multiple gas dynamic properties in complex flow fields. Such approach can operate on species thatare naturally present in high-enthalpy ground test facilities (e.g. NO, OH and alkali metals) or produced behind shock waves in hypersonic air flows, or possibly through tracer addition at very low concentrations. To realize this new measurement strategy, we will conduct research in several interconnected stages, including selection and spectroscopic characterization of the optimal transitions of fluorescence tracers, validation of measurement methodology, proof-of-concept demonstration in laboratory environments, iterative sensor design and optimization for future applications in high enthalpy ground test systems.The development of this research program will provide critical measurement capabilities strongly needed for Navy-related aerothermodynamics research. Performer anticipates that the SR-LIF measurement strategy proposed here, once developed, will provide the ultimate diagnostic needed for characterizinghigh-enthalpy flows near body surfaces. We also expect that its subsequent applications in Navy related hypersonic ground testing can provide critical validation of computational fluid dynamics codes under development for application in hypersonic ground testing, and ultimately facilitate improveddesign of next-generation hypersonic vehicles. The proposed research also offers prospects to turn parasitic impurities naturally present in ground test facilities into extremely useful fluorescence tracers and thereby revolutionize modern diagnostic methodology in Navy-related high-enthalpy flow testing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 29, 2020
- Source ID
- N000142012322
Entities
People
- Ronald Kent Hanson
Organizations
- Office of Naval Research
- Stanford University
- United States Navy