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• W2609853018 abstract "Abstract The infrared (IR) irradiance signature from rocket motor exhaust plumes is closely related to motor type, propellant composition, burn time, rocket geometry, chamber parameters and flight conditions. In this paper, an infrared signature analysis tool (IRSAT) was developed to understand the spectral characteristics of exhaust plumes in detail. Through a finite volume technique, flow field properties were obtained through the solution of axisymmetric Navier-Stokes equations with the Reynolds-averaged approach. A refined 13-species, 30-reaction chemistry scheme was used for combustion effects and a k-e-Rt turbulence model for entrainment effects. Using flowfield properties as input data, the spectrum was integrated with a line of sight (LOS) method based on a single line group (SLG) model with Curtis-Godson approximation. The model correctly predicted spectral distribution in the wavelengths of 1.50–5.50 μm and had good agreement for its location with imaging spectrometer data. The IRSAT was then applied to discuss the effects of three operating conditions on IR signatures: (a) afterburning; (b) chamber pressure from ignition to cutoff; and (c) minor changes in the ratio of hydroxyl-terminated polybutadiene (HTPB) binder to ammonium perchlorate (AP) oxidizer in propellant. Results show that afterburning effects can increase the size and shape of radiance images with enhancement of radiation intensity up to 40%. Also, the total IR irradiance in different bands can be characterized by a non-dimensional chamber pressure trace in which the maximum discrepancy is less than 13% during ignition and engine cutoff. An increase of chamber pressure can lead to more distinct diamonds, whose distance intervals are extended, and the position of the first diamond moving backwards. In addition, an increase in HTPB/AP causes a significant jump in spectral intensity. The incremental rates of radiance intensity integrated in each band are linear with the increase of HTPB, and the growth rates of radiance intensities in some bands reach up to 50% as HTPB weight increases by 3%." @default.
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• W2609853018 date "2017-06-01" @default.
• W2609853018 modified "2023-10-01" @default.
• W2609853018 title "IR radiation characteristics of rocket exhaust plumes under varying motor operating conditions" @default.
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• W2609853018 doi "https://doi.org/10.1016/j.cja.2017.04.003" @default.
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