采用时间分辨立体PIV确定瞬态平面压力场

Introduction
Particle image velocimetry (PIV) has proven its strength as a flow diagnostic tool to characterise
instantaneous velocity fields and derived quantities such as vorticity. Recent efforts apply momentum
conservation principles on planar velocity data in order to extract more quantities, such as pressure
fields and integral aerodynamic forces. The theoretical concepts for this 憄lanar pressure imaging?
(PPI) have been established and its practical implementation for steady (or time-averaged) flows under
approximately 2D flow conditions has been demonstrated (e.g. Baur and K鰊geter 1999, Gurka et al.
1999, Oudheusden et al. 2007). The next challenge is to extend PPI to unsteady flows. This extension
can be done on basis of time-resolved flow diagnostics such as time-resolved PIV (TR-PIV),
cf. Kurtulus et al. 2007. Instantaneous pressure fields are particularly interesting in bluff-body flows
and in fluid-structure interactions, both are important in e.g. wind-engineering applications. A serious
complication in extending the planar approach is that flows tend to develop 3D instantaneous
structures even for nominally 2D configurations, especially at larger Reynolds numbers. 德国LaVision PIV/PLIF粒子成像测速场仪 时间分辨粒子成像测速系统(TR-PIV) 三维立体PIV