Accession Number:

AD0829143

Title:

PROBING TECHNIQUES FOR USE IN HIGH TEMPERATURE REACTING FLOWS

Descriptive Note:

Final rept. Jul 1965-Dec 1967

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1968-03-01

Pagination or Media Count:

56.0

Abstract:

A basic probe has been designed which consists of a 18-in.-diam, water-cooled copper probe with an inside diameter of 0.050 in. These probes may be aspirated to take a gas sample and temperature reading, or used without aspiration to measure total pressure. Two systems currently being investigated to measure temperature are quartz-coated thermocouples and pneumatic thermometers. These probe designs were chosen because they should not include the heat of recombination of non-equilibrium gases in the temperature reading as would a calorimeter-type total enthalpy probe. The gases are analyzed on line with a bistable fluid oscillator having an oscillation frequency that is a function of the molecular weight of the sample. No quantitative theory of fluid oscillators is available however, observations are given of the effect of some of the design parameters on performance. A study was made of the effect of probe shape and Mach number on the validity of samples taken in a supersonic stream. For hydrogen-nitrogen mixtures at a static pressure of 1 atm, no change between the free stream and the sample was seen in any of the tests.

Subject Categories:

  • Physical Chemistry
  • Fluidics and Fluerics
  • Test Facilities, Equipment and Methods
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE