Accession Number : AD0743999

Title :   Chemical Laser Nozzle Flow Diagnostics.

Descriptive Note : Rept. for Oct 70-May 71,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Varwig,Robert L.

Report Date : 15 FEB 1972

Pagination or Media Count : 48

Abstract : Diagnostic techniques, including schlieren, chemiluminescent photography, pitot pressure, and total temperature probes, have been evaluated and applied to the problem of determining the flow properties in the laser cavity of a supersonic diffusion laser system. For the present schlieren system, the plenum pressure and temperature requirements are indicated. It is shown that chemiluminescent photography can provide shock pattern details in air-like gases for plenum temperatures of the order of 2000K at pressures of about 1 atm. Seeding with gases can also provide information. Pitot pressure probes make possible the detection and tracking of shock waves and can, therefore, be used to determine if exit pressure and ambient pressure are matched. The measured total temperature and pitot pressure profiles were compared with theoretical predictions based on boundary layer growth. (Author)

Descriptors :   (*GAS LASERS, *NOZZLE GAS FLOW), FLOW VISUALIZATION, SCHLIEREN PHOTOGRAPHY, CHEMILUMINESCENCE, HIGH SPEED PHOTOGRAPHY, SUPERSONIC FLOW, SHOCK WAVES, PRESSURE, TEMPERATURE, MEASUREMENT, DIFFUSION, PITOT TUBES, BOUNDARY LAYER

Subject Categories : Lasers and Masers
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE