10-kHz simultaneous dual-plane stereo-PIV and OH-PLIF imaging

10-kHz-rate two-color dual-plane stereo-PIV using an optical parametric oscillator

“…Velocity uncertainty for PIV measurement is usually 1%-2% with a proper experimental setup [1,4,5,35,37]. The polarization-based DSPIV measurement uncertainty has been discussed in details in [21]. The residual scattering due to the other plane transmission leakage is ∼10% in polarization-based DSPIV technique.…”

“…For the polarization-based separation method, however, it is difficult to achieve the perfectly orthogonal linear polarization detection because of the particle scattering depolarization effect. Based on earlier study reported in [21], there is ∼10% residual scattering light contributing from the other plane which provides additional data processing efforts and increasing the measurement uncertainties. For the temporal separation method, it requires two lasers to generate two pairs of PIV pulses simultaneously which increases the difficulties for preparing experimental equipment and setup.…”

“…Using this method, 10 Hz DSPIV in turbulent flows have been reported by Hu et al [26]. Recently Fugger et al have demonstrated highspeed, time-resolved DSPIV measurements [21]. The second technique is using temporal separations.…”

“…However, to our knowledge, TPIV has three shortages compared to dual-plane approach: (a) high laser pulse energy is needed for large area measurement. For example, 350 mJ per pulse at 10 Hz is applied for a field-of-view (FOV) of 70 × 35 × 8 mm 3 [11], whereas the laser pulse energy needed for DSPIV is only ∼20 mJ [21]. (b) For TPIV, the particle seeding density needs to be less because of the seeding particle overlapping effect.…”

“…(c) Lower in-plane spatial resolution as compared to DSPIV [22]. Compared to TPIV, DSPIV is usually applied in flows with high out-of-the-plane velocity component such as swirl flows and shear layers for accurate in-plane flow velocity and shear stress measurements [21][22][23][24].…”