Accession Number : ADA289246

Title :   An Investigation of the AFIT 2-Inch Shock Tube as a Flow Source for Supersonic Testing.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Vlcek, Kevin M.

PDF Url : ADA289246

Report Date : DEC 1994

Pagination or Media Count : 52

Abstract : An investigation of the AFIT high pressure shock tube was conducted to determine how closely it followed ideal shock tube theory and to determine the available test times for an attached Mach 3 nozzle. The driver section was five feet (1.52 m) long and the driven section was 25 feet (7.62 m) long. The driver gas used for this study was helium while the driven gas was atmospheric air. The pressure rise measured behind the incident shock wave was, on average, 30% lower than predicted by the ideal shock tube relations. Behind the reflected shock, the pressure rise was 65% lower than predictions based on initial driver gas pressure. Due to supply pressure limits and lower than predicted pressures behind the shock waves, fully expanded flow in the Mach 3 nozzle was not attained. However, steady overexpanded flows of Mach 2.74-2.96 were observed for periods of 4-12 milliseconds.

Descriptors :   *SUPERSONIC FLOW, *SHOCK TUBES, PRESSURE TRANSDUCERS, SHOCK WAVES, THESES, HIGH PRESSURE, FLOW RATE, DATA ACQUISITION, HELIUM, MACH NUMBER, NOZZLE GAS FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE