等方性乱れに関する実験的研究

概要

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The compensated amplifier for the hot-wire anemometry is developed by using a reactance tube as an inductance element. The decay of turbulence behind an interwoven wire mesh grid, with the mesh length of 14mm and the wire diameter of 2mm, is measured for the mean velocity of 10, 15 or 20 m/s in the circular open-jet type 1.5m wind tunnel. The decay is much faster than that obtained by Townsend and an appreciable dependence on velocity is observd. The q-correlation measurement shows a fairly self-preserving nature. A tapered, parallel-T, R-C network is developed and used for a selective amplifier, by which the spectrum of turbulence is measured. The spectrum is entirely Dryden-spectrum except for the high frequency range, in which it tends to -3 power of the frequency. It is also completely self-preserving and shows no dependence on velocity. The three-dimensional spectrum and energy transfer function are also calculated from the measured one-dimensional spectrum,
宇宙航空研究開発機構の論文
1953-10-10