ランダム位相法の吹き出し直後の乱流圧力場の観察

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  • Observation of Turbulence Field near the Inlet of the Test Section

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<p>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 outflows from adjacent ducts, and found that this driving mode realizes high intensity (12-16 %) and large integral scale (0.6-0.7 m). It is focused on the pressure characteristics deeply related to vortex formation and tried to clarify the dominant parameters of ‘random-phase mode’. 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. As a result pressure drop depends on the r.m.s value ue’ of the input velocity signal. It was confirmed that the turbulence intensity increases with ue’.</p>

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