壁面湍流边界层压力起伏的高速层析PIV（Tomo-PIV）和直接

In the present study it is attempted to use the 3D time-resolved velocity field measurements
obtained by employing a high-speed tomographic PIV system on a flat plate turbulent boundary layer at
Re=730. The main objective of the study is the estimation of the wall pressure coherence function for the
prediction of aeroacoustic noise radiated by boundary layers and trai领 edge flows. The reconstruction of
the pressure field from velocity field measurements follows the approach of de Kat and van Oudheusden
(2012), whereby the Poisson equation is integrated over the measurement volume in 3D. Due to restriction
on the extent of the measurement volume, uniform pressure is applied as boundary condition on stream- and
spanwise faces.
A direct numerical simulation of the boundary layer at a similar Reynolds number is performed in order to
produce reference data for the velocity statistics and for the properties of the spectral fluctuations. The
tomographic data agree very well with DNS as far as mean and fluctuating velocity components are
concerned.
Velocity field results are compared to 2C-PIV and the DNS solution and a collapse of the data is
demonstrated. An additional reference measurement is introduced in order to validate the procedure of
pressure determination from time-resolved tomographic PIV. Time series of pressure and the scaled power
spectral density at a single point are compared to the DNS solution and results available from literature and
good agreement is found. The correlation coefficient with respect to pinhole microphone measurements
reaches a maximum value above 50% for data band-pass filtered between 250Hz and 3.5kHz. Finally, the
coherence of the pressure fluctuations and the resulting spanwise coherence length are computed compared. 自适应粒子成像测速场仪（PIV） 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) 体视层析粒子成像测速系统(Tomo-PIV)