Accession Number : AD0642280

Title :   MINIATURE ENTHALPY PROBES FOR HIGH TEMPERATURE GAS STREAMS.

Descriptive Note : Interim rept. Jan 65-Feb 66,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Vassallo,Franklin A.

Report Date : JUN 1966

Pagination or Media Count : 64

Abstract : A study is reported in which a number of stagnation enthalpy probes are discussed and their performance experimentally evaluated. Effort is directed to probe instruments which operate on the total calorimetric principle. Prime emphasis is placed on the accuracy and operational characteristics of probes less than 0.1 in. in diameter. Presently available recirculating probe types receive important attention, but major consideration is given to the operation of a new, rapid response, calorimetric probe discussed in the text. Results show the total calorimetric probes which utilize a 'tare' measurement to operate satisfactorily when appropriate corrections to account for gas sample flow are included. Change in probe size is found to have influence primarily on the upper limit of operation of the instrument. Tests of the AVCO or 'split-flow' total calorimetric probe type indicate it to have little advantage in miniature size over that of the conventional single flow probe types. Both analytical and experimental studies of rapid response probes show this concept to be significantly better than that of the above types in terms of speed, size, and operational limits. Although the experiments indicate instrument output to be proportional to gas enthalpy as predicted by analysis, insufficient tests have been conducted to establish accuracy of this probe type. (Author)

Descriptors :   (*ENTHALPY, *GAS FLOW), (*HIGH TEMPERATURE, GAS FLOW), PLASMA JETS, CALORIMETRY, EVAPOTRANSPIRATION

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics
      Plasma Physics and Magnetohydrodynamics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE