Measurements of flow-field properties in a gasdynamic laser nozzle wake

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:7030335

Peterson, C W

Detailed measurements were made in the nonreacting (cold flow) wake of a gasdynamic laser (GDL) nozzle array to provide flow-field data with which to evaluate theoretical GDL fluid mechanical models and numerical prediction schemes. Pilot pressure, stagnation temperature, and static pressure measurements were made across the wake and along the wake centerline at twelve streamwise locations and at two nozzle Reynolds numbers. Redundant static pressure measurements were made to identify and correct any probe interference errors caused by the small dimensional wake scales. Pitot measurements across the GDL nozzle boundary layer were included to provide information on the initial conditions to the wake, and hot wires were used to define the wake turbulence level. Turbulent wake centerline data agreed closely with turbulent predictions from an existing linearized wake theory. Measurements in a transitional wake indicated that transition begins near the wake edge and moves toward the wake centerline as Reynolds number is increased. Centerline flow properties observed in the transitional wake could not be predicted by either laminar or turbulent linearized theory.

• Research Organization: Sandia Labs., Albuquerque, N.Mex. (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 7030335
• Report Number(s): SAND-77-2100C; CONF-780711-4
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
FLUID FLOW
GAS FLOW
GAS LASERS
LASERS
NOZZLES
REYNOLDS NUMBER