管群気柱共鳴における渦放出同期化現象のモデリング

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  • Study on modeling method of vortex shedding synchronization in heat exchanger tube bundles
  • カングンキチュウ キョウメイ ニ オケル ウズ ホウシュツ ドウキカ ゲンショウ ノ モデリング

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Acoustic resonance may occur in heat exchangers such as gas heaters or boilers which contain tube bundles. The purpose of this study is to develop modeling method of vortex shedding synchronization because this is the most essential part of critical fl ow velocity prediction. Here, acoustic resonance level dependence of spatial correlation of vortex shedding is expressed by coherence function betweenwake-oscillator behaviors in any two locations in the cavity. The feedback eff ect in synchronization of vortex shedding is represented by resonant level dependence of the wake-oscillator phase fl uctuationrange. This method gives the result that when resonance level increases, synchronization level in the tube bundles also increases, which seems to be a reasonable conclusion. Experimental method to identify the undefi ned parameters in the proposed method is also mentioned.

Acoustic resonance may occur in heat exchangers such as gas heaters or boilers which contain tube bundles. The purpose of this study is to develop modeling method of vortex shedding synchronization because this is the most essential part of critical fl ow velocity prediction. Here, acoustic resonance level dependence of spatial correlation of vortex shedding is expressed by coherence function betweenwake-oscillator behaviors in any two locations in the cavity. The feedback eff ect in synchronization of vortex shedding is represented by resonant level dependence of the wake-oscillator phase fl uctuationrange. This method gives the result that when resonance level increases, synchronization level in the tube bundles also increases, which seems to be a reasonable conclusion. Experimental method to identify the undefi ned parameters in the proposed method is also mentioned.

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