Experimental verification of a PIV-based pressure field reconstruction technology in supersonic flows  

作　　者：Jie TIAN Jinglei XU Shun LIU Le CAI 

机构地区：[1]State Key Laboratory of Mechanics and Control of Aeronautics and Astronautics Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [2]College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [3]School of Energy and Power Engineering,Jiangsu University,Zhenjiang,212013,China

出　　处：《Science China(Technological Sciences)》2025年第3期239-257,共19页中国科学(技术科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.12332018)。

摘　　要：This study proposes a novel approach that involves applying the flux vector splitting(FVS)technique to discretize and approximate conservative Navier-Stokes equations and thus reconstruct pressure fields from planar velocimetry data in compressible flows,especially for supersonic flows with strong shocks.Data are typically resolved by using the particle image velocimetry(PIV)technique.Two supersonic experiments under Mach 2.9-3.0 conditions were conducted to generate strong shocks and investigate the performance of the FVS method,including oblique shock flow and shock wave/boundary layer interaction(SWBLI)coupled with flow separation.Reconstructed pressure fields were comprehensively evaluated.The shock polar results indicated that FVS method possessed higher accuracy in post-shock regions with a pressure ratio error of less than2%,especially for the areas downstream of the shock-shock intersection point and the shock-boundary intersection point,where the conventional Poisson method was ineffective and larger errors accumulated.Wall pressure in SWBLI flow also had better agreement.Furthermore,the performances of different methods were discussed from the perspective of the physical characteristics in supersonic flows,which explained the superiority of the FVS method because the pressure information was delivered along the characteristic direction of physical waves.

关 键 词：particle image velocimetry supersonic flow pressure reconstruction flux vector splitting technique 

分 类 号：O35[理学—流体力学]