Accession Number:

ADA010619

Title:

The Use of Shaped Cavities to Improve the Sidewall Boundary Layer Quality in Gas Dynamic Lasers

Descriptive Note:

Interim rept.

Corporate Author:

AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Petty, James S.
• Cooper, James R.
• Korkegi, Robert H.

Report Date:

1975-03-01

Pagination or Media Count:

18.0

Abstract:

A series of cavity shapes was tested on the sidewall of a Mach 3 high Reynolds number wind tunnel to determine the effects of the cavity and its downstream lip shape on the external flow. Various mass injection rates into the cavity were provided. Holographic interferommetry, oil flow, and a fast response surface pressure transducer were used to take data. Results indicate that a rectangular cavity with a lip shaped as a short rounded overhang least disturbs the turbulent boundary layer. Low levels of mass injection were found to have little effect on boundary layer quality.

Descriptors:

• *LASER CAVITIES
• *FLOW FIELDS
• *SUPERSONIC FLOW
• *GAS DYNAMIC LASERS
• VELOCITY
• INJECTION LASERS
• TURBULENT BOUNDARY LAYER
• FLOW VISUALIZATION
• GAS DYNAMICS
• INTERFEROMETRY
• HOLOGRAPHY
• PRESSURE
• REYNOLDS NUMBER
• SUPERSONIC WIND TUNNELS

Subject Categories:

• Lasers and Masers
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE