AN EXPERIMENTAL STUDY OF THE DECAY OF TURBULENT ENERGY IN SEVERAL GASES AND AT HIGH AND LOW DENSITY
Abstract
A hot-wire anemometer study of the decay of turbulent energy downstream of a grid in atmospheric pressure air, argon and helium and at several ambient pressure levels in air was carried out. A variable density low speed blowdown tunnel was employed which was operated over the range 0.2 to 8 atmospheres pressure. It was found in the decay measurements that above a grid Reynolds number, RM, of about 2,000 and at atmospheric pressure and above, an identical initial period decay law occurred independent of the gas employed or the ambient pressure level. There was no evidence indicating the invalidity of the continuum view of turbulence for this range. For RM below 1,000 or at low ambient pressure, however, a decrease in the normal turbulence intensity was found, the magnitude of which appeared to depend on the pressure level and the gas employed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1962
- Accession Number
- AD0276521
Entities
People
- W.h. Webb
Organizations
- Princeton University