Accession Number:

AD0867975

Title:

Calibration of the AEDC-PWT Aerodynamic Wind Tunnel (4T) Using Diffuser Flap Plenum Suction

Descriptive Note:

Final rept.

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1970-04-01

Pagination or Media Count:

45.0

Abstract:

Tests were conducted in the transonic Aerodynamic wind tunnel 4T of the Propulsion Wind Tunnel Facility to determine the effectiveness of ejector flaps for plenum pumping. During the test, the Mach number was varied from 0.2 to 1.0, and the wall porosity was varied from 1.0 to 8.0 percent. The maximum Mach number attained when using flap plenum suction alone was slightly higher than 1.0. Choking which occurred at the flap hinge point prevented the attainment of higher Mach numbers. It was found that at each Mach number and porosity, a specific flap position will give a minimum centerline Mach number deviation, but for ease of operation, it is recommended that a flap position of 2.00 in. be set for all normal test conditions. The ejector flaps simplify the Tunnel 4T operation by reducing the number of control variables needed to set test conditions and also reduce the Tunnel 4T power requirements at some test conditions by as much as 19 percent

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE