A pressure field reconstruction method for supersonic complex flow fields based on PIV technology

CN116467957BActive Publication Date: 2026-06-30NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-02-22
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing PIV technology cannot achieve high-precision pressure field reconstruction in supersonic flow fields. In particular, it suffers from reduced reconstruction accuracy and error propagation in complex wave systems, and cannot meet the requirements for non-contact measurement with high spatiotemporal resolution.

Method used

The pressure field is discretized using the Steger-Warming flow vector splitting method based on PIV technology, combined with Jacobian matrix eigenvalue splitting and finite difference scheme. The boundary error problem at the shock wave is then solved by physical correction using the Rankine-Hugonic shock wave relation.

Benefits of technology

It achieves high-precision pressure field reconstruction of complex supersonic flow fields, improves reconstruction efficiency and accuracy at the boundary, and expands the application scope of PIV technology in supersonic flow fields.

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Abstract

This invention first discloses a pressure field reconstruction method for supersonic complex flow fields based on PIV technology. The method uses the momentum and energy equations of fluid mechanics as the basic governing equations, combined with the gas state equation and calorimetric state equation to close the governing equations. According to the specific flow field form, the corresponding boundary conditions and initial conditions are selected. The flow vector splitting method of the Steger-Warming scheme in computational fluid dynamics is used to perform appropriate finite difference processing on the flow vectors of the governing equations. Through explicit time-progressive iterative solution, the pressure field, temperature field, density field and other multi-physical flow field information corresponding to the PIV velocity field are reconstructed, which greatly improves the universality and accuracy of the reconstruction technology in complex supersonic compressible flow fields.
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