The present study aims to study the evolution of an inclined synthetic jet in a quiescent ambiance. The inclined synthetic jet is particularly useful in drag reduction and separation control applications. The synthetic jet is generated using cam-follower-based linear actuation through a \(30^\circ \) inclined circular orifice. The study has been conducted at Re = 232 and \(L/D = 1.3\) . The peak time-averaged velocity is skewed towards \(\psi = \pi \) side of the orifice. The ring has higher circulation towards \(\psi = \pi \) side, compared to \(\psi = 0\) side. During evolution of synthetic jet, it bends towards the \(\psi = 0\) side. The secondary structures are induced near the orifice, which induces a velocity that advects the ring towards the wall (orifice plate). The low circulation side of the ring further interacts with the wall and loses vorticity. The inclined synthetic jet has higher decay rate and limited penetration in the wall normal direction. The phase-averaging technique is used to study the evolution of the synthetic jet. The low-dimensional POD reconstruction is performed to extract the phase information from the PIV velocity measurement, and compared to direct phase averaging technique.

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The PIV Measurements of Inclined Synthetic Jet

  • Malkeet Singh,
  • Kamal Raj Sharma,
  • Arun K. Saha

摘要

The present study aims to study the evolution of an inclined synthetic jet in a quiescent ambiance. The inclined synthetic jet is particularly useful in drag reduction and separation control applications. The synthetic jet is generated using cam-follower-based linear actuation through a \(30^\circ \) inclined circular orifice. The study has been conducted at Re = 232 and \(L/D = 1.3\) . The peak time-averaged velocity is skewed towards \(\psi = \pi \) side of the orifice. The ring has higher circulation towards \(\psi = \pi \) side, compared to \(\psi = 0\) side. During evolution of synthetic jet, it bends towards the \(\psi = 0\) side. The secondary structures are induced near the orifice, which induces a velocity that advects the ring towards the wall (orifice plate). The low circulation side of the ring further interacts with the wall and loses vorticity. The inclined synthetic jet has higher decay rate and limited penetration in the wall normal direction. The phase-averaging technique is used to study the evolution of the synthetic jet. The low-dimensional POD reconstruction is performed to extract the phase information from the PIV velocity measurement, and compared to direct phase averaging technique.