MEASUREMENTS OF THE HYPERSONIC, RAREFIED FLOW FIELD OF A DISK.
Abstract
The flow density and temperature about a disk normal to a hypersonic, rarefied stream were measured. The tests were conducted in nozzle-produced flow fields of dry nitrogen. The electron beam fluorescence technique (EBT) was utilized to determine local fluid density and rotational temperature. In addition, impact pressure surveys were made in the wake and photographs of the flow field were obtained by traversing the electron beam with the camera shutter held open. Two higher Mach number centerline density and temperature profiles show qualitative agreement with free-molecular and first collision theoretical estimates. In general, the axial and lateral extents of the disk flow field are much greater than in continuum flow over the same geometry. The rotational temperature data indicates that essentially full temperature recovery is achieved near the forward stagnation point. The maximum shock layer densities, however, are somewhat below the Rankine-Hugoniot values for the given free stream Mach numbers due to the finite width of the electron beam and the thickening effect on the shock of the degree of gas rarefaction. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0710641
Entities
People
- Stewart Berlin
Organizations
- University of Southern California