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A Tomographic Background-Oriented Schlieren (TBOS) technique is developed toaid in the visualization of compressible flows. An experimental setup wasdevised around a sub-scale rocket nozzle, in which four cameras were set up ina circular configuration with 30{\deg} angular spacing in azimuth. Measurementswere taken of the overexpanded supersonic jet plume at various nozzle pressureratios (NPR), corresponding to different flow regimes during the start-up andshut-down of rocket nozzles. Measurements were also performed for differentcamera parameters using different exposure times and f-stops in order to studythe effect of measurement accuracy. Density gradients and subsequentlytwo-dimensional line-of-sight integrated density fields for each of the cameraprojections are recovered from the index of refraction field by solving aPoisson equation. The results of this stage are then used to reconstructtwo-dimensional slices of the (time-averaged) density field using a tomographicreconstruction algorithm employing the filtered back-projection and thesimultaneous algebraic reconstruction technique. By stacking thesetwo-dimensional slices, the (quasi-) three-dimensional density field isobtained. The accuracy of the implemented method with a relatively low numberof sparse cameras is briefly assessed and basic flow features are extractedsuch as the shock spacing in the overexpanded jet plume.

Density Field Reconstruction of an Overexpanded Supersonic Jet using Tomographic Background-Oriented Schlieren