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Measurements of admittances and characteristic combustion times of reactive gaseous propellant coaxial injectorsThe results of an experimental investigation that was concerned with the quantitative determination of the capabilities of combustion processes associated with coaxial injectors to amplify and sustain combustor oscillations was described. The driving provided by the combustion process was determined by employing the modified standing-wave method utilizing coaxial injectors and air-acetylene mixtures. Analyses of the measured data indicate that the investigated injectors are capable of initiating and amplifying combustion instabilities under favorable conditions of injector-combustion coupling and over certain frequency ranges. These frequency ranges and the frequency at which an injector's driving capacity is maximum are observed to depend upon the equivalence ratio, the pressure drop across the injector orifices and the number of injector elements. The characteristic combustion times of coaxial injectors were determined from steady state temperature measurements.
Document ID
19790014997
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Janardan, B. A. (Georgia Inst. of Tech. Atlanta, GA, United States)
Daniel, B. R. (Georgia Inst. of Tech. Atlanta, GA, United States)
Zinn, B. T. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1979
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-CR-159542
Accession Number
79N23168
Funding Number(s)
CONTRACT_GRANT: NSG-3052
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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