Accession Number:

AD0702806

Title:

EXPERIMENTS WITH A SUPERSONIC TUBE WIND-TUNNEL

Descriptive Note:

Final rept. Oct 1968-Nov 1969

Corporate Author:

YALE UNIV NEW HAVEN CT DEPT OF ENGINEERING AND APPLIED SCIENCE

Report Date:

1970-03-01

Pagination or Media Count:

49.0

Abstract:

An experimental study was performed of the unsteady processes in the starting period of a supersonic Ludwieg tube, a device which operates like an intermittent supersonic wind tunnel. A quick opening diaphragm located downstream of the nozzle initiates the flow. Pressure and density measurements are made in a variety of ways in Mach number 1.67 and 3.0 nozzles. For the starting conditions treated, supersonic flow is established in the nozzle without producing shock waves. Various time dependent functions are observed in the adjustment of gas-dynamic parameters to their steady supersonic values. These changes of pressure, et., include undershoots, overshoots, and other variations of the final steady-state values. Calculations based on an assumed zero-length nozzle do not adequately predict starting times and pressures.

Subject Categories:

  • Aerodynamics
  • Test Facilities, Equipment and Methods
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE