Accession Number : AD0703746

Title :   VISCOUS EFFECTS ON BLUNT PLATES AT HYPERSONIC SPEEDS.

Descriptive Note : Interim technical rept.,

Corporate Author : OHIO STATE UNIV COLUMBUS AERONAUTICAL AND ASTRONAUTICAL RESEARCH LAB

Personal Author(s) : Lee,John D.

Report Date : JAN 1970

Pagination or Media Count : 41

Abstract : An experimental and theoretical study of the influences of the displacement interaction caused by a laminar boundary layer on a blunt-edged flat plate in a hypersonic stream was conducted. Significant increases in surface pressure were noted when the leading-edge Reynolds number was less than about 3000 for a near-adiabatic plate and less than about 200 for a very cold plate while appreciably lower Reynolds numbers were required to influence the heat transfer rates. Experimental techniques were developed to permit the acquisition of pressure and heat transfer data with errors of less than a few percent to accurately determine the trends at low Reynolds numbers. The theoretical approach utilized local similarity concepts and a modified blast equation, applied piecewise and iterated along the surface, while accounting for the large streamline deviations produced by the streamwise pressure gradients. The interaction with the lateral entropy gradient was ignored. Over the range of the experimental data, the theory predicted the pressure and the heating rates with excellent accuracy. (Author)

Descriptors :   (*REENTRY VEHICLES, HYPERSONIC CHARACTERISTICS), (*LAMINAR BOUNDARY LAYER, BLUNT BODIES), FLAT PLATE MODELS, VISCOSITY, INTERACTIONS, PRESSURE, LEADING EDGES, REYNOLDS NUMBER, HEAT TRANSFER

Subject Categories : Aerodynamics
      Guided Missile Reentry Vehicles
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE