パルス燃焼器内の流動および伝熱に関する研究 : テールパイプ内の等温空気脈動流の流動および乱れ特性

概要

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In order to obtain clear prefiles of the fluid dynamic and thermal behavior in a tailpipe of the valveless pulse combustor, cold pulsating air flows in a circular pipe are first experimentally investigated with a hot-wire anemometer of constant temperature type, which is equipped with a single I-probe. Then, the flow and turbulence characteristics of the pulsating flows are qualitatively clarified by comparing them with those of the ordinary turbulent pipe flows. The results show that the pulsation induces intense velocity fluctuations, not only in the low frequency regions, centered on the pulsation frequency and its harmonics, but also in a relatively high frequency region up to about 500Hz, causing rms values greater than those of the ordinary pipe flow by about one order of magnitude. Also, the effects of the pulsation on the turbulence generation across a section are found to be less remarkable in the near-wall region than the central one.
一般社団法人日本機械学会の論文
1990-09-25