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仪器网/ 行业应用/ 解决方案/ 基于PIV的湍动边界层区域内压力起伏的测量

基于PIV的湍动边界层区域内压力起伏的测量

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The unsteady pressure field is obtained from time-resolved tomographic particle image
velocimetry (Tomo-PIV) measurement within a fully developed turbulent boundary layer at free stream
velocity of U = 9.3 m/s and Re = 2400. The pressure field is evaluated from the velocity fields
measured by Tomo-PIV at 10 kHz invoking the momentum equation for unsteady incompressible flows.
The spatial integration of the pressure gradient is conducted by solving the Poisson pressure equation with
fixed boundary conditions at the outer edge of the boundary layer. The PIV-based evaluation of the
pressure field is validated against simultaneous surface pressure measurement using calibrated condenser
microphones mounted behind a pinhole orifice. The comparison shows agreement between the two
pressure signals obtained from the Tomo-PIV and the microphones with a cross-correlation coefficient of 0.6
while their power spectral densities (PSD) overlap up to 3 kHz. The use of the Tomo-PIV system with the
application of three-dimensional momentum equation shows higher accuracy compared to the planar version
of the technique. The combination of a correlation-sliding-average technique, the Lagrangian approach to
the evaluation of the material derivative and the planar integration of the Poisson pressure equation results in
the best agreement with the pressure measurement of the surface microphones. 德国LaVision PIV/PLIF粒子成像测速场仪
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