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A flow calorimeter for determining combustion efficiency from residual enthalpy of exhaust gasesA flow calorimeter for determining the combustion efficiency of turbojet and ram-jet combustors from measurement of the residual enthalpy of combustion of the exhaust gas is described. Briefly, the calorimeter catalytically oxidizes the combustible constituents of exhaust-gas samples, and the resultant temperature rise is measured. This temperature rise is related to the residual enthalpy of combustion of the sample by previous calibration of the calorimeter. Combustion efficiency can be calculated from a knowledge of the residual enthalpy of the exhaust gas and the combustor input enthalpy. An accuracy of +-0.2 Btu per cubic foot was obtained with prepared fuel-air mixtures, and the combustion efficiencies of single turbojet combustors measured by both the flow-calorimeter and heat-balance methods compared within 3 percentage units. Flow calorimetry appears to be a suitable method for determining combustion efficiencies at high combustor temperatures where ordinary thermocouples cannot be used. The method is fundamentally more accurate than heat-balance methods at high combustion efficiencies and can be used to verify near-100-percent efficiency data.
Document ID
19930088015
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Evans, Albert
Hibbard, Robert R
Date Acquired
August 29, 2013
Publication Date
March 10, 1954
Report/Patent Number
NACA-RM-E53L21b
Accession Number
93R17305
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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