SOME EXPERIMENTS ON IMPACT-PRESSURE PROBES IN A LOW-DENSITY, HYPERVELOCITY FLOW
Abstract
An experimental investigation of the behavior of flat-faced, impact- pressure probes with a range of orifice-to-probe diameter ratios was made in heated nitrogen, where Mach number was 9.3, stagnation temperature was 3000 K, and the unit Reynolds number was 260/in. It was found, contrary to experience in low-density, unheated flows, that the impact pressure decreased with a reduction in orifice diameter for a fixed probe outer diameter in these tests. A discussion of the factors which could cause this decrease is contained herein. An analysis of the data indicates that in order to obtain as accurate a value of impact pressure as possible in low-density, hypervelocity flows, attention must be given to a number of factors, including viscous effects, thermal gradient effects, probe shape, thermal or chemical nonequilibrium, and non-continuum fluid phenomena.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1961
- Accession Number
- AD0268391
Entities
People
- A. B. Bailey
- D. E. Boylan
Organizations
- Arnold Engineering Development Complex