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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Technik Luft- und Raumfahrttechnik Radiation from High Pressure Hydrogen-Oxygen Flames and its Use in Assessing Rocket Combustion Instability
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Radiation from High Pressure Hydrogen-Oxygen Flames and its Use in Assessing Rocket Combustion Instability
Thomas Fiala (Broschiert, Englisch)
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Optischer Zustand
Beschreibung
Visible and ultraviolet radiation is a readily measurable property of a flame. This study investigates the radiation of non-premixed hydrogen-oxygen flames at elevated pressure, which often power liquid rocket engines. Such flames mainly emit UV radiation from excited OH* radicals and exhibit a broad-band radiation peaking in the blue spectrum. Both types of radiation are examined experimentally… and numerically in a laminar jet flame at pressures ranging from 1 bar to 40 bar. Emission and absorption are measured spectrally and spatially. Physical models for numerically simulating either radiation are summarized and extended by new methods. Their practical use and limitations are assessed by comparison with experimental data. Especially the difference between chemical an thermal excitation of OH* as well as its self-absorption are scrutinized. Additionally, the radiation is compared to the volumetric heat release rate, which is an important parameter in studying combustion instabilities. Generally, both quantities are found to be quantitatively uncorrelated for non-premixed flames. Studies of counterflow flame ensembles reveal that in coarsely resolved turbulent flames with low optical density, a qualitative relation between line-of-sight integrated radiation and heat release rate exists. To quantitatively measure heat release rate, radiation measurements must be corrected for the influence of flame straining. Due to this fact, alternate methods are presented to assess combustion instabilities by radiation data. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
27.08.2015
Sprache
Englisch
EAN
9783843922500
Herausgeber
Dr. Hut
Serien- oder Bandtitel
Raumfahrt
Sonderedition
Nein
Autor
Thomas Fiala
Seitenanzahl
151
Einbandart
Broschiert
Schlagwörter
Assessing Rocket Combustion Instability, High Pressure Hydrogen-Oxygen Flames, Radiation
Thema-Inhalt
T - Technologie, Ingenieurswissenschaft, Landwirtschaft
TTDS - Astronautik (Raumfahrttechnik)
TTD - Weltraumforschung
TT - Andere Technologien und verwandte Wissenschaften
Höhe
210 mm
Breite
14.8 cm
-.-
★★★★★
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