年次大会
Online ISSN : 2424-2667
ISSN-L : 2424-2667
セッションID: G051041
会議情報
G051041 二周波数の合成波入力により生成された乱流の空間発展([G051-04]流体工学部門,一般セッション : 乱流・超音速・制御)
高牟礼 光太郎池田 寛小園 茂平
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会議録・要旨集 フリー

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抄録
It was previously reported an input disturbance composed of some tens of frequencies can induce rapid development of homogeneous turbulence using a multi-fan type wind tunnel for which 99 small fans were driven to generate turbulence. Since this method includes many frequencies, little is known about requirements of frequencies. Here, we investigated streamwise development of homogeneous turbulence characteristics using input disturbances to which different pairs of frequencies contributed. First, disturbances composed of two selected frequencies, f_A = mf_0 and f_B = nf_0 were defined, and then two parameters, f_<mid> = (f_A + f_B)/2 and Δf = f_A - f_B, were introduced. It was found that integrated statistics such as intensity and scale were significantly dependent on fmid, but less dependent on Δf. Interestingly, however, in the case where m and n were coprime, more peaks emerged at frequencies af_A ± bf_B (a, b ; integers) in the downstream direction, but in the case where m and n were not coprime, regularly-spaced peaks sparsely appeared.
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© 2013 一般社団法人 日本機械学会
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