Application of a Spectroscopic Measuring Technique to Plasma Discharge in Hypersonic Flow PDF Download
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Category :
Languages : en
Pages : 14
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Book Description
Spatially resolved rotational temperatures have been obtained within the boundary layer of a flat plate model in a Mach 5.1 flow using emission spectroscopy. The temperatures were obtained by matching the measured nitrogen second positive 0-2 rovibrational band with a calculated one. Temperature profiles are given above the cathode and the anode. The maximum temperature obtained above the cathode did not correspond to the surface of the model, but rather at an elevation 0.55 mm above the surface. This indicates that heat is traveling from the discharge into the plate for a period of time after the discharge is ignited. This characteristic in the temperature profile sheds light on some of the effects a plasma has on the flow field as determined by Pitot probe measurements and total lift measurements.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Spatially resolved rotational temperatures have been obtained within the boundary layer of a flat plate model in a Mach 5.1 flow using emission spectroscopy. The temperatures were obtained by matching the measured nitrogen second positive 0-2 rovibrational band with a calculated one. Temperature profiles are given above the cathode and the anode. The maximum temperature obtained above the cathode did not correspond to the surface of the model, but rather at an elevation 0.55 mm above the surface. This indicates that heat is traveling from the discharge into the plate for a period of time after the discharge is ignited. This characteristic in the temperature profile sheds light on some of the effects a plasma has on the flow field as determined by Pitot probe measurements and total lift measurements.
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Book Description
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 912
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Book Description
Author:
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ISBN:
Category : Energy development
Languages : en
Pages : 578
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Book Description
Author: Hoyt Clarke Hottel
Publisher:
ISBN:
Category : High temperatures
Languages : en
Pages : 84
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Book Description
Author:
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 810
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Book Description
Author: Sergi Kazantsev
Publisher: Springer Science & Business Media
ISBN: 9780306456763
Category : Technology & Engineering
Languages : en
Pages : 360
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Book Description
A uniquely practical book, this monograph is the first to describe basic and applied spectroscopic techniques for the study of physical processes in high frequency, electrodeless discharge lamps. Special attention is given to the construction and optimization of these lamps, a popular source of line spectra and an important tool in ultraprecise optical engineering. Highlights include discussions of: high precision measurements of gas pressures spectral source lifespan and more.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 712
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Book Description
Author: Christopher Lyle Strand
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The work presented herein describes several advances in the evolution of combustion diagnostics based upon the technique of tunable diode laser absorption spectroscopy (TDLAS). The primary focus of this work was to provide the theoretical and practical means to perform in-situ TDLAS measurements within the harsh flow environments of hypersonic impulse ground-test facilities. In addition to this primary focus, the development and application of this work led to a comprehensive analytical framework for wavelength-modulation spectroscopy and enhanced the understanding of the complex flow environments within hypersonic flow facilities and hypersonic combustion experiments. Hypersonics is the field of aeronautics concerned with flight speeds that are highly supersonic, typically on the order of Mach 5 and above. Presently, it is the domain of spacecraft during re-entry and a select cadre of rocket-powered and air-breathing test vehicles (e.g., North American X-15, NASA X-43, Boeing X-51, HyShot I-IV, HiFiRE 0-3, etc.). It is also a regime of grand aspirations, including routine inexpensive space access, rapid intercontinental transport, atmospheric entry on other planets, and numerous strategic military applications. The development of hypersonic technology is confounded by the immensity of the problem, especially the complexity of interacting physical phenomena and the shortcomings in the fundamental understanding thereof. Understanding of this complex regime and the development of technologies to utilize this regime for flight require a comprehensive scientific and engineering approach including fundamental theory, computations, ground-testing, and flight testing. Due to the capacity of ground-test facilities to formulate tractable hypersonic experiments and, within those experiments, the capability of specialized diagnostics to extract critical information, ground-testing is the primary approach to cracking the multi-physics puzzle of hypersonic flight. Shock-tube-derived impulse flow facilities are a specific form of hypersonic ground-test facility and fill a critical niche within the field. These facilities are characterized by extremely short test times, often less than a few milliseconds, but excel at producing high-enthalpy flows with realistic flow chemistry. This capability is particularly valuable for the investigation of chemically reacting flows within air-breathing hypersonic vehicles such as the scramjet. Effective use of the short-duration test time is progressively being unlocked by the development of modern high-bandwidth instrumentation. Tunable diode laser absorption spectroscopy (TDLAS) offers the potential to provide quantitative measurement of numerous critical flow parameters within these facilities, including temperature, velocity, and species partial pressure. The violent flow environment of a flow model in an impulse ground-test facility creates a formidable challenge for the implementation of a TDLAS diagnostic. Impulse flow test times on the order of 1 ms necessitate exceptionally high measurement bandwidths to capture relevant transient phenomena. Harsh flow conditions introduce substantial measurement noise through mechanically- and density-gradient-induced beam-steering. Short optical paths within the model limit the magnitude of the optical absorption signal and the confined environment limits the resources available for required optical hardware. Further challenges are introduced through the requirements of generating an academically valuable dataset. Multiple simultaneous quantitative measurement parameters at numerous locations within the flow-field are often desirable in both reacting and non-reacting flows. To address the challenges of TDLAS sensing in impulse flow facilities, the efforts of this work include advances in both diagnostic methodology and optical hardware design. A new analytical framework has been developed for the technique of scanned-wavelength-modulation spectroscopy (scanned-WMS) to reject noise and achieve high-sensitivity while permitting the simultaneous measurement of temperature, partial pressure, and velocity. This new framework has enabled accurate measurements at unprecedented bandwidths in harsh flow environments. Integration of TDLAS optical components into flow models has led to novel approaches for harsh-environment optical alignment hardware, combining precision and sufficient robustness to survive repeated firings of an impulse facility. Furthermore, the intense beam-steering induced by facility vibrations and turbulent density gradients have motivated a comprehensive redesign of conventional beam collection approaches. TDLAS diagnostics leveraging these advances have been implemented in both the Stanford Expansion Tube Flow Facility for the purpose of facility characterization and in the HyShot II scramjet experiment at the High Enthalpy Shock Tunnel in Göttingen, Germany to investigate reacting and non-reacting scramjet flows. Results from each of these campaigns are presented as an illustration of the diagnostic capabilities developed in this work.
Author: R. Kenneth Marcus
Publisher: John Wiley & Sons
ISBN: 0470857862
Category : Science
Languages : en
Pages : 498
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Book Description
This multi-author, edited volume includes chapters which deal with both basic and highly complex applications. Glow discharge devices are now being used in very novel ways for the analysis of liquids and gases, including molecular species detection and identification, an area that was beyond the perceived scope of applicability just ten years ago. It is expected that the next decade will see a growth in the interest and application of glow discharge devices far surpassing the expectations of the last century. Responding to the rapid growth in the field Includes both GD-MS and GD-AES In-depth coverage of applications Co-edited by the top names in the field in Europe and US, with high calibre contributions from around the world
