マルチファン型風洞による乱流圧力場の観察

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  • Observation of Turbulence Field using a Multi-fan Wind Tunnel

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Easy control of turbulence intensity and scale is of basic importance for the experiments concerning effects of turbulence in a wind tunnel. Using a `multi-fan wind tunnel', we devised `random-phase mode', which makes use of shear layers generated between the outfows from adjacent ducts, and found that this driving mode realizes high intensity (12-16 %) and large integral scale (0.6-0.7 m). In the present paper, in order to determine which parameter facilitates the turbulence control, we conducted measurements of pressure field immediately downstream of the inlet of the test section. It was found that the pressure drop is characterized by the rms. value μ'e of the input velocity signal. Thus, it is expected that turbulence intensity might be controlled by μ'e. It was confirmed that the turbulence intensity increases with μ'e.

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