Accession Number : AD0643822

Title :   THE USE OF SELF-CALIBRATING CATALYTIC PROBES TO MEASURE FREE-STREAM ATOM CONCENTRATION IN A HYPERSONIC FLOW,

Corporate Author : TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Reddy,N. M.

Report Date : NOV 1966

Pagination or Media Count : 93

Abstract : A technique is presented to measure simultaneously the catalytic efficiency and the free stream atom concentration in a hypersonic flow of dissociated gas. The principle involved is to measure the differential heat transfers by using, either a combination of axisymmetric and two-dimensional, differential catalytic probes, or two geometrically similar, differential catalytic probes mounted side by side in a uniform, dissociated, hypersonic free-stream. Using these measured quantities in the appropriate stagnation point heat transfer relations for a frozen flow, simple formulae are derived. The feature of these formulae is that, unlike the full expression for stagnation point heat transfer, they are independent of such quantities as viscosity, velocity, and density. Only the stagnation enthalpy and the Lewis number need to be known. This self-calibrating principle is shown to apply not only in the boundary layer regime but also in the viscous shock layer (merged layer) regime. The most suitable geometric proportions for the gauges are given. (Author)

Descriptors :   (*HYPERSONIC FLOW, *PROBES), ATOMS, DENSITY, HEAT TRANSFER, STAGNATION POINT, CATALYSIS, CALIBRATION, CANADA

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE