Design and Flight Qualification of a Diode Laser-based Optical Mass Flux Sensor PDF Download
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Author: Michael F. Miller
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Category :
Languages : en
Pages :
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Author: Michael F. Miller
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: KoHse-HoingHaus
Publisher: Taylor & Francis US
ISBN: 9781560329381
Category : Technology & Engineering
Languages : en
Pages : 748
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The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measurement schemes; and engineers, who know combustion systems and processes. This book assists in providing guidance for the planning of combustion experiments, in judging research strategies and in conceiving new ideas for combustion research. It provides a snapshot of the available diagnostic methods and thier typical applications from the perspective of leading experts in the field.
Author:
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Category : Airplanes
Languages : en
Pages : 548
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Author: Michael F. Miller
Publisher:
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Category :
Languages : en
Pages :
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Author:
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Category : Aerodynamics
Languages : en
Pages : 616
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Author:
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ISBN:
Category :
Languages : en
Pages : 17
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This document contains the specific requirements and preliminary results for the Optical Mass Capture (OMC) experiment for the Fundamental RESearch Hypersonic Flight experimentation (FRESH Fx) program. The objective of this effort is to develop and demonstrate in flight a diode-laser-based measurement of engine air mass capture in the inlet or isolator of a hypersonic vehicle over an altitude range of 60,000-90,000 ft with an average Mach number of 7.5 over this range. The concept involves the direct measurement of oxygen concentration via absorption spectroscopy, and gas velocity via the Doppler shift of laser light transiting the flowpath. The deduced density-velocity product in a known flow area yields the mass flow rate.
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Category : Aeronautics
Languages : en
Pages : 1044
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Author: Jan-Philipp Koester
Publisher: Cuvillier Verlag
ISBN: 3736968825
Category :
Languages : en
Pages : 171
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Edge-emitting quantum-well diode lasers based on GaAs combine a high conversion efficiency, a wide range of emission wavelengths covering a span from 630 nm to 1180 nm, and the ability to achieve high output powers. The often used longitudinal-invariant Fabry-Pérot-type resonators are easy to design but often lead to functionality or performance limitations. In this work, the application of laterally-longitudinally non-uniform resonator configurations is explored as a way to reduce unwanted and performance-limiting effects. The investigations are carried out on existing and entirely newly developed laser designs using dedicated simulation tools. These include a sophisticated time-dependent laser simulator based on a traveling-wave model of the optical fields in the lateral-longitudinal plane and a Maxwell solver based on the eigenmode expansion method for the simulation of passive waveguides. Whenever possible, the simulation results are compared with experimental data. Based on this approach, three fundamentally different laser types are investigated: • Dual-wavelength lasers emitting two slightly detuned wavelengths around 784 nm out of a single aperture • Ridge-waveguide lasers with tapered waveguide and contact layouts that emit light of a wavelength of around 970 nm • Broad-area lasers with slightly tapered contact layouts emitting at 910 nm The results of this thesis underline the potential of lateral-longitudinal non-uniform laser designs to increase selected aspects of device performance, including beam quality, spectral stability, and output power.
Author: Leyen S. Chang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Mass flux is one of the most critical parameters in the calculation of engine thrust and assessment of aeroengine performance. Conventional mass-flux measurements are facilitated with invasive temperature and pressure probes which tend to disturb the flow, generate shock structures, have limited lifetimes, and require frequent maintenance. In response, there is a growing opportunity for tunable diode laser (TDL) diagnostics, which can be deployed noninvasively with fast time response and high accuracy. The focus of this work is the development of a TDL mass-flux sensor based on water vapor absorption for deployment in a combustion-driven Mach 2.7 wind tunnel at NASA Langley. The 1f-normalized wavelength-modulation spectroscopy with second harmonic detection (WMS-2f/1f) technique was employed for its unique noise-rejection capability and increase in signal-to-noise ratio; this method was used to measure velocity with improved precision while simultaneously determining temperature. Density was inferred from an independent pressure measurement and the ideal gas law. The sensor temperature measurements were validated against thermocouple readings in a heated cell at Stanford to within 1%. Measurements of velocity were made in a low-speed wind tunnel with accuracy within 0.5m/s of a pitot probe reading; a reduction of 50% in the standard deviation of the velocity measurement was also observed by using optimized WMS-2f/1f. In addition, the influence of flow nonuniformity on line-of-sight (LOS) measurements is investigated by simulating path-integrated lineshapes from computational fluid dynamics (CFD) solutions. The results are quantified in order to develop a correction to the path-integrated measurements obtained in this work. The capstone mass-flux measurements were performed in the NASA Langley Direct-Connect Supersonic Combustion Test Facility isolator. Temporally resolved velocity data was corrected according to the nonuniformity analysis of path-integrated lineshapes, bringing the sensor velocity measurement within 0.25% of the value predicted by the facility code (4m/s in a 1630m/s flow). Temperature measurements were made with high precision (10K standard deviation in a 990K flow), and agreement with the predicted value was also within 1%. Mass-flux measurements had similar precision (standard deviation less than 1% of full scale) and accuracy (within 1% of predicted value). Finally, spatially resolved velocity and mass-flux data taken along both the height and width of the isolator were found to be in close agreement with the CFD solution. These results show that TDL mass-flux sensing based on WMS-2f/1f can produce temporally and spatially resolved measurements with high precision and accuracy in a supersonic flow, thus demonstrating the sensor's potential for future deployment in unknown mass-capture environments such as inlet models and flight tests.
Author: Kent Hamilton Lyle
Publisher:
ISBN:
Category :
Languages : en
Pages : 181
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