A promising multiple-arrayed pressure sensor, which was consisted of PVDF (polyvinylideneflouride), was devised and evaluated. In order to compensate frequency response of the sensor, linear modelling of pressure measurement system was performed and the transfer function of the sensor was estimated. Using the determined transfer function of the system, the time history of unsteady pressure has been reconstructed from the output of the sensor. The reconstructed pressure signal shows good agreement with the reference microphone data in spectral sense.
With this newly developed pressure sensor, the wall pressure fluctuations in a two-dimensional, surface-mounted obstacle flow has been investigated. It is found that pressure spectra show unsteady movement of flow such as shedding of large-scale vortices. Also the point of maximum wall pressure fluctuation coincides with the time-averaged reattachment point, which was measured by split film sensor.
