Accession Number : AD0002953


Title :   PROGRESS REPORT 1 AUGUST-30 SEPTEMBER 1952. Contract No. N7 ONR-35805 (Brown Univ.)


Corporate Author : BROWN UNIV PROVIDENCE RI


Personal Author(s) : MAEDER, P F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/002953.pdf


Report Date : Sep 1952


Pagination or Media Count : 5


Abstract : Calibration data in the M = 0.8 to 1.1 range for a section cont aining 3 dimensionally shaped upper and lower walls indicated satisfactory velocity distribution. The re-entry flow downstream of the slots was improved by inserting adjustable flaps. The elimination of flow instabilities by inserting an adjustable center body in the flow at the re-entry flaps is being investigated. Difficulty was encountered in correlating results of a study of the boundary layer characteristics of a variety of perforated walls. Data obtained with a jet open on 1 side to secure constant pressure along the test section and a knife edge which cut off the boundary layer prior to its reaching the perforated wall revealed suction values agreeing with values predicated by a simplified theory analogous to the theory of free-jet mixing.


Descriptors :   *WIND TUNNEL TESTS , STABILITY , BOUNDARY LAYER , CALIBRATION , TRANSONIC WIND TUNNELS , GAS FLOW


Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE