To provide a bubble generation device capable of surely generating fine bubbles without increasing resistance force a vessel receives from water.SOLUTION: A cylindrical bubble generation device provided in a portion positioned below the water line of a vessel includes: an entrance opening having water flow inside; an air-supply unit for supplying gas inside this bubble generation device; a first diameter reduction unit reducing diameter as going from the entrance opening to the rear; a first diameter increasing unit increasing diameter as going from the first diameter reduction unit to the rear; a second diameter reduction unit reducing diameter as going from the first diameter increasing unit to the rear; a second diameter increasing unit increasing diameter as going from the second diameter reduction unit to the rear; and a draining opening for draining gas-liquid mixed phase fluid of water and gas from the second diameter increasing unit. The flow rate of the respective fluids in the first diameter reduction unit and the second diameter reduction unit are increased compared to the average flow rate of the total fluid of the bubble generation device and the flow rate of the fluid in the second diameter reduction unit is supersonic.SELECTED DRAWING: Figure 2
【課題】船舶が水から受ける抵抗力を増加させることなく、微細気泡を確実に生成することができる気泡生成装置を提供する。【解決手段】気泡生成装置は、船舶の喫水線より下方に位置する部分に設けられる筒状の気泡生成装置であって、水が内部に流入する流入口と、この気泡生成装置の内側に気体を供給する給気部と、流入口から後方に向かうに従い、縮径する第1縮径部と、第1縮径部から後方に向かうに従い、拡径する第1拡径部と、第1拡径部から後方に向かうに従い、縮径する第2縮径部と、第2縮径部から後方に向かうに従い、拡径する第2拡径部と、第2拡径部から水と気体との混相流体を排出する排出口と、を備え、第1縮径部および第2縮径部それぞれにおける流体の流速は、気泡生成装置全体における流体の平均流速と比べて増大しているとともに、第2縮径部における流体の流速は、超音速となっている。【選択図】図2
BUBBLE GENERATION DEVICE
気泡生成装置
2019-07-25
Patent
Electronic Resource
Japanese
IPC: | B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS |
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