Choking analysis for a CW HF or DF chemical laser

Journal Article · Fri Oct 01 04:00:00 EDT 1982 · AIAA J.; (United States)

DOI:https://doi.org/10.2514/3.7983· OSTI ID:6430694

Emanuel, G

This study investigates choking in the optical cavity of a CW HF or DF chemically-pumped laser. Choking can occur because of the large heat release when the flow in the cavity is constrained by plume shrouds. An analysis procedure is described that starts in the oxidizer and fuel plenums, follows both gases through the nozzles where the flow is viscous, and into a constant area laser cavity where mixing and heat addition occur. A parametric investigation is performed that centers around a He diluent case and an N/sub 2/ diluent case. The parameters that are varied include plenum conditions, composition, nozzle geometry, etc. The most important results are (1) a He diluent flow is more likely to choke than one with N/sub 2/, (2) the oxidizer stagnation temperature and oxidizer diluent ratio are the dominant choking parameters, (3) shifting diluent from the oxidizer to the fuel flow can lead to choking, (4) nozzle geometry has a minor effect on choking, and (5) Reynolds number scaling for choking is demonstrated.

• Research Organization: Oklahoma, University, Norman, OK
• OSTI ID: 6430694
• Journal Information: AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 20; ISSN AIAJA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CHEMICAL LASERS
COOLING SYSTEMS
ELEMENTS
ENERGY SYSTEMS
ENERGY TRANSFER
FLUID FLOW
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GAS DYNAMIC LASERS
GAS LASERS
GASES
HALIDES
HALOGEN COMPOUNDS
HEAT TRANSFER
HELIUM
LASER CAVITIES
LASERS
MACH NUMBER
MIXING
NITROGEN
NONMETALS
NOZZLES
OXIDIZERS
RARE GASES
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REYNOLDS NUMBER
SHROUDS
STEADY FLOW
VELOCITY