-Energy devices

-Bio-related flow





  Pressure sensitivie patint

 To measure the unsteady pressure on the
rotating fan blades, the measurement methods
for the pressure sensitive paint are developped.

Experimental setup

Visualized pressure

  High-speed PIV

 Flow fields are clarified by high-speed PIV. As a result, the aerodynamical noise sources are identified. 感圧塗料
Experimental setup

Aerodynamical noise

1. Touki Uda, Akinobu Nishikawa, Satoshi Someya and Akiyoshi Iida, "Prediction of aeroacoustic sound using the flow fieldobtained by time-resolved particle image velocimetry",Measurement Science and Technology,22(7), pp.075402.1-075402.10IOP
2. Nobuhiro Yamazaki, Akinobu Nishikawa, Touki Uda, Takehisa Takaishi, and Akiyoshi Iida, "Experimental Evaluation Methods ofAeroacoustic Noise Based on Time Series Analysis of Flow Field",Journal of Environment and Engineering,6(2), pp.380-290J-STAGE
3. Hiroshi Yokoyama and Chisachi Kato, "Fluid-acoustic interactions in self-sustainedoscillations in turbulent cavity flows. I. Fluid-dynamic oscillations,"Physicsof Fluids21, 105103 (2009).AIP

  High-accuracy aeroacoustic simulation

 To establish the methods of aeroacoustic simulation with high accuracy and low cost, hybrid and direct simulations are performed.
Acoustic fields

Comparison of direct andhybrid simulations

1. Hiroshi Yokoyama and Akiyoshi Iida, "Aerodynamic Sound Sources from Flows around aRectangular Cylinder with a Low MachNumber",Transactions of the Japan society ofmechanical engineers Series B,79(799), pp.344-366, 2013. (in Japanese)J-STAGE