角度をもつ環状衝突噴流の研究 : 非定常特性

概要

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Existence of a critical opening angle θ_c was found in steady experiments on an angled annular impinging jet. This paper deals with unsteady characteristics of the flow field. The cross-spectrum and correlation functions of pressure fluctuation at the center of a disk placed at the downstream end of an inner tube and on flat plate bombarded by the jet were measured simultaneously by varying the distance H between the angled annular nozzle and the flat plate. It was found that there were four types of large-scale distinguishable frequencies for pressure, accordig to the value of H in the case of opening angle θ<θ_c, but only one type in the case of θ>θ_c. It was verified that large-scale fluctuation existing in the flow field of the angled annular impinging jet had essentially two modes in the case of θ<θ_c and one mode in the case of θ>θ_c.
一般社団法人日本機械学会の論文
1993-10-25