Abstract
Abstract : The usefulness of the inversion of rocket plume infrared emission and absorption profiles obtained experimentally in transverse scans across the nozzle exit plane in order to retrieve radial profiles of plume temperature and concentration is examined in detail. Principal aspects on the problem included: (1) the use of state-of-the-art band radiation models that account for highly nonuniform plumes and Doppler broadening effects; (2) the development of an iterative Abel inversion algorithm that allows the application of the well-known Abel inversion to nonthin optical sources; and (3) the formulation of a 'quasi- objective' data smoothing procedure. The characteristics and error of inversion are determined for several synthetic data cases which approximate real rocket plumes and applied to actual data obtained from engine test firings.
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