Time-resolved large-scale volumetric pressure fields of an impinging jet from dense Lagrangian particle tracking
Time-resolved volumetric pressure fields are reconstructed from Lagrangian particle tracking with high seeding concentration using the Shake-The-Box algorithm in a perpendicular impinging jet flow with exit velocity \(U=4\) m/s (\(Re\sim 36,000\)) and nozzle-plate spacing \(H/D=5\). Helium-filled soap bubbles are used as tracer particles which are illuminated with pulsed LED arrays. A large measurement volume has been covered (cloud of tracked particles in a volume of 54 L, \(\sim 180,000\) particles). The reconstructed pressure field has been validated against microphone recordings at the wall with high correlation coefficients up to 0.88. In a reduced measurement volume (13 L), dense Lagrangian particle tracking is shown to be feasable up to the maximal possible jet velocity of \(U=16\) m/s.
The authors would like to thank Janos Agocs, Stefan Haxter, Thomas Ahlefeldt, Dirk Michaelis, Uwe Dierksheide and Jiggar Shah for their help during the setup and execution of the experiment. We acknowledge the support of LaVision GmbH with camera equipment and the seeding generator. Work including the experimental results has partly been funded by the DFG-project Analyse turbulenter Grenzschichten mit Druckgradient bei großen Reynoldszahlen mit hochauflösenden Vielkameramessverfahren (Grant KA 1808/14-1 and SCHR 1165/3-1).
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