Accession Number:

ADA076124

Title:

Flameout and Acoustic Damping in Pulsed Chemical Lasers

Descriptive Note:

Final technical rept.

Corporate Author:

AVCO EVERETT RESEARCH LAB INC EVERETT MA

Personal Author(s):

• Limpaecher, R.

Report Date:

1979-06-01

Pagination or Media Count:

143.0

Abstract:

The objective of this program was to address the acoustic damping issue of a repetitively-pulsed atmospheric pressure pulsed chemical laser. For this purpose a device, one meter in size parallel to the optical axis, was designed and constructed. To achieve flameout 80 fluidic devices were used to control the hydrogen flow. A new mixer was fabricated to obtain the required medium quality using a photochemical machining technique. For the acoustic quieting a heat exchanger was used to reduce the acoustic reflection of the hot- cold gas interfaces, and a muffler type acoustic absorber was constructed for acoustic energy attenuation. The results of a limited test period have been described.

Descriptors:

• *ACOUSTIC REFLECTION
• *CHEMICAL LASERS
• *INFRARED LASERS
• *PULSED LASERS
• BAROMETRIC PRESSURE
• DAMPING
• FLAMEOUT
• FLUORINE
• HEAT EXCHANGERS
• HYDROGEN
• INTERFACES
• LASER CAVITIES
• VISCOUS FLOW

Subject Categories:

• Lasers and Masers
• Acoustics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE