1618 下流に障害物をもつ拘束噴流の発振特性(G05-3 流体工学(3)非定常流れ,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In the present study, the authors investigate an oscillatory phenomenon of a two-dimensional confined jet with a downstream target, by experiments and computations. By experiments in air and water, jet's frequencies are measured near the target by a hot-wire anemometer and an ultrasonic velocity profiler with a particle-image velocimetry, respectively, at the Reynolds number Re<5000. In computations, the present numerical method is a finite difference method formulated in terms of vorticity and stream function. As a result, we can see the Re effect, the target-distance effect and the target-size effect upon the Strouhal number St. Regarding the Re effect, it is found that there is less influence, which guarantees wide-range workability as a flowmeter or a mixer. All the results can be summarised in empirical formulae describing the relation between St and geometrical parameters.
一般社団法人日本機械学会の論文
2008-08-02