F2 Boundary Layer Measurement in a Chemical Laser Slit Nozzle Flow

F2 Boundary Layer Measurement in a Chemical Laser Slit Nozzle Flow

A sensitive F2 absorption diagnostic suitable for slit nozzle scanning was developed and applied to the measurement of an F2 boundary layer in an HF chemical laser flow. The F2 boundary layer profile was determined to be of exponential decay form with peak at the nozzle wall and of width approx. 1/3...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Spencer,D J, Durran,D A, Bixler,H A, Varwig,R L
Format: Report
Sprache:eng
Schlagworte:
BOUNDARY LAYER
CHEMICAL LASERS
CONCENTRATION(CHEMISTRY)
DIAGNOSIS(GENERAL)
EFFICIENCY
FLOW
FLUORINE
HYDROGEN FLUORIDE LASERS
Lasers and Masers
MEASUREMENT
NOZZLES
RECOMBINATION REACTIONS
Slit nozzles
Sulfur tetrafluoride
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Beschreibung
Zusammenfassung:A sensitive F2 absorption diagnostic suitable for slit nozzle scanning was developed and applied to the measurement of an F2 boundary layer in an HF chemical laser flow. The F2 boundary layer profile was determined to be of exponential decay form with peak at the nozzle wall and of width approx. 1/3 the viscous boundary layer. The F2 concentration profile was displaced inwardly and slightly compressed by the H2 slit injection at the nozzle exit plane, which penetration profile followed the relation delta = 0.1(sq. root of x). The F2 profile apparently remains fairly intact in passing through the lasing zone.