抄録
The influence of wall compliance on the turbulent boundary layer on a flat plate was investigated experimentally by using PIV system and by measuring the pressure on the wall surface. Test compliant wall is made of silicon resin having Young's modulus of E=1.5 MPa, density of p_c=1.20×10^3 kg/m^3, and the thickness t=10 mm. The mean velocities over the flat plate are U_m=105, 175, 260, 330, and 400 mm/s (Re=3.8×10^4, 6.3×10^4, 9.3×10^4, 1.15×10^5, and 1.4×10^5 at x=500 mm). It was clarified that the frequency of the sweep events and the ejection events are decreased only at U_m=260 mm/s by the compliant wall and as a consequence, the generation of the low-speed streaks in the near wall region are controlled. In this case, the pressure fluctuation on the compliant wall decreases, and the spectrum of the pressure fluctuation decreases at F=220 [Hz] (peak frequency of the pressure fluctuation) and at 600 [Hz] < F < 800 [Hz] (natural frequency of the compliant wall).
