| Citation: | Wei Xiangzhi, Shi Jingwei, Zhou Li, et al. Experimental investigation of the three-dimensional density field reconstruction in supersonic jets based on BOST methodology[J]. Journal of Aerospace Power, 2026, 41（7）：20240686 doi: 10.13224/j.cnki.jasp.20240686
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The refined characterization of supersonic jet flow fields remains a critical technical challenge for enhancing aircraft aerodynamic performance and suppressing exhaust noise. This study systematically investigated the three-dimensional density field reconstruction of supersonic jets from an axisymmetric convergent-divergent nozzle using background-oriented schlieren tomography (BOST). First, the coupled effects of experimental parameters on the measurement sensitivity and spatial resolution were analyzed, and the BOST three-dimensional reconstruction mathematical model was established. Subsequently, a simulation experiment containing noise was designed to validate the model’s robustness. The results demonstrated that the reconstruction model maintained density field accuracy within 4.5% under high noise levels, confirming the robustness of the method. Finally, a multi-view BOST experimental system was implemented to reconstruct the three-dimensional density fields under typical experimental conditions. Results successfully captured the refined three-dimensional structures including the jet core region, shock trains, and expansion wave systems. The average errors on the centerline between the reconstructed density fields and numerical simulations were determined as 6.4%, 4.7%, and 5.0% under three experimental conditions, with shock positions showing good agreement with schlieren visualization. The BOST effectively visualized the transition process from Mach reflection to regular reflection induced by the increasing total inflow pressure, verifying the reliability of BOST in the three-dimensional diagnostics of supersonic jets. These findings provide high-precision flow field data crucial for nozzle optimization design.
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