Comparative Study of Background-oriented Schlieren Measurement Methods Based on Axisymmetric Jet Flow
Background-oriented schlieren(BOS)is a non-contact flow field measurement technique based on light refraction,which can quantitatively obtain density information of the flow field.The background-oriented schlieren tomography(BOST)technology combined with tomography can reconstruct the three-dimensional density field.This study focuses on the axisymmetric nozzle and uses the BOS method to measure the two-dimensional density field of the supersonic jet.Under the assumption of axisymmetric,the BOST method is used to reconstruct the three-dimensional density field and compare it with the two-dimensional results.Research has shown that two-dimensional BOS averages the flow field information integrated by the line of sight,ignoring the impact of changes in flow field structure along the optical path direction.The BOST model contains projection information from multiple angles,which more accurately reconstructs the three-dimensional structure of the jet and the high spatial resolution density field.
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