Diode Laser Diagnostics of High Speed Flows

Williams, Skip; Barone, Dominic; Barhorst, Todd; Jackson, Kevin; Lin, Kuo-Cheng; Masterson, Pat; Zhao, Qingchun; Sappey, Andrew D.

doi:10.2514/6.2006-7999

Cited by 25 publications

(8 citation statements)

References 5 publications

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“…Details of the hardware setup and implementation can be found elsewhere. 9,10,11,12 To better understand the three types of signals collected we examine a sample raw signal trace shown in Fig. 1.…”

Section: Absorption and Emissionmentioning

confidence: 99%

Application of Diode-Laser-Based Measurements in Hypersonic Flows

Brown

2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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The development of optical techniques capable of measuring in-stream flow properties of air breathing hypersonic engines is a goal of the Aerospace Propulsion Division at AFRL. This goal is motivated by the need for in-stream data to support both ground and flight tests of scramjet engine designs. While particular fundamental hypersonic flow problems are addressable using well-established laser-based techniques, advanced engine concepts using axisymmetric hardware typically have minimal optical access making some of the more traditional techniques difficult to deploy. To meet the need we have an ongoing in-house program to mature diode-laser-based techniques for application in hypersonic flows. Additional motivation for developing diode-laser-based measurement strategies comes from the need for flight sensors. Flight-worthy packages must be small, light, low-power and rugged. For measurement objectives in both ground and flight experiments we have adopted tunable diode laser absorption spectroscopy making heavy use of fiber coupling and integrated optomechanics. Water-based measurements of temperature, pressure, velocity, and water mole fraction are executed using time-multiplexed near-infrared diodes. These fundamental flow parameters can be combined to yield optical mass capture and thrust. Similar measurements can be made in inlets using an oxygen-based strategy employing visible diodes. In this paper we summarize the absorption sensor work done to date in AFRL. Particular attention will be paid to the fact that a single hardware platform can be used to capture absorption, non-resonant transmission, and optical emission signals all three of which provide relevant information.

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Section: Absorption and Emissionmentioning

confidence: 99%

Application of Diode-Laser-Based Measurements in Hypersonic Flows

Brown

2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…The primary flight experiment was an inward turning, two-dimensional (2-D), hydrocarbon-fueled scramjet combustor, supporting both primary and secondary research objectives. The secondary flight experiment was a tunable diode-laser absorption spectroscopy (TDLAS) system designed to monitor temporal and spatial water vapor concentration in the core flow of the combustion products at the combustor exit plane [16]. In addition to the further development of flight-capable core flow instrumentation, the secondary experiment also supported the flights' primary and secondary objectives through the data collected.…”

Section: Flight Experiments and Research Objectivesmentioning

confidence: 99%

Mach 6–8+ Hydrocarbon-Fueled Scramjet Flight Experiment: The HIFiRE Flight 2 Project

Jackson

Gruber

Buccellato

2015

Journal of Propulsion and Power

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The Hypersonic International Flight Research Experimentation (HIFiRE) program is a collaborative international effort designed to study basic hypersonic phenomena through flight experimentation. On 1 May 2012, the HIFiRE Flight 2 project successfully flew a hydrocarbon-fueled, Mach 8 scramjet experiment and demonstrated the ability to fly an accelerating, constant dynamic pressure trajectory consistent with a scramjet-powered flight vehicle using unguided sounding rocket techniques. The project goals of capturing high-quality flight data from a research scramjet operating through dual-to-scram mode transition up to and beyond Mach 8 were achieved. HIFiRE Flight 2 is unique in its contribution to scramjet research, providing a reference dataset to the hydrocarbon scramjet community while maturing a novel and reduced-cost strategy for performing similar future experiments. This paper describes the programmatic approach, the overall scramjet flight test experiment mission objectives, and the flight test strategy. It also includes an overview of launch system and payload hardware, and brief discussions of flight activities, flight data, and experimental results. Preliminary results from flight indicate a fully successful mission and experiment. Based on evaluations of data collected during the project, including ground test, flight test, and multiple analysis activities, all project-level scientific objectives have been successfully achieved.

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“…9 Gas sample The Doppler shift of the transition center line position (∆ν s ) can also been used to infer the bulk-average, onecomponent velocity measurements. 3,[10][11][12][13][14] The Doppler shift arises when the absorbing species move with a (bulk) velocity U in a direction with a relative angle α with respect to the measurement LOS:…”

Section: Introductionmentioning

confidence: 99%

Multi-parameter estimation for spatially-resolved measurement of two-component velocity using absorption tomography

Gamba

2015

53rd AIAA Aerospace Sciences Meeting

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In this work, we extend the use of absorption tomography typically used for the spatial measurement of species concentration and/or temperature over a planar region of a flow to the measurement of the local twocomponent velocity and potentially, simultaneously with temperature and pressure. The reconstruction is allowed by a compact reconstruction scheme based on the properties of the absorption lineshape (assumed to be a Voigt lineshape). Here, we will present the mathematical formulation of the problem, we will offer a possible solution strategy and we will demonstrate the method through a numerical experiment.

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Diode Laser Diagnostics of High Speed Flows

Cited by 25 publications

References 5 publications

Application of Diode-Laser-Based Measurements in Hypersonic Flows

Application of Diode-Laser-Based Measurements in Hypersonic Flows

Mach 6–8+ Hydrocarbon-Fueled Scramjet Flight Experiment: The HIFiRE Flight 2 Project

Multi-parameter estimation for spatially-resolved measurement of two-component velocity using absorption tomography

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