安定成層流中の乱流輸送機構 : 第1報, 温度成層風洞の特性と内部重力波の発生

概要

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A controllable thermal stratification generator with 30 channels of heater arrangements, accompanied by a velocity-control unit was set in a settling chamber of a wind tunnel. A stratified flow field having a stepwise temperature distribution was realized, in which the maximum temperature gradient was about 2200K/m. The mean temperature and velocity distributions were quite uniform, and initially, the intensities of their fluctuations were satisfactorily small. Its bulk Richardson number of R_<ib> = 7.39 × 10^<-3> sufficed the strongly stably stratified conditions. Velocity and temperature fluctuations increased downstream in the mixing layer. Spectrum analyses showed that the developing waves in the mixing layer were the internal gravity waves having frequencies not exceeding the Brunt-Vaisala frequency of N=5.56Hz.
社団法人日本機械学会の論文
1991-02-25