平板微气泡减阻预报及影响因素研究  

Study on Resistance Reduction and Influencing Factors of a Flat Plate by Micro-Bubbles

作　　者：郭峰[1] 欧勇鹏[1] 董文才[1] 毕毅[1] 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033

出　　处：《中国造船》2008年第B10期66-74,共9页Shipbuilding of China

基　　金：全国优秀博士学位论文作者专项资金资助项目(200551);国家部委重点基金项目资助(9140A14030106JB1101)。

摘　　要：假定气-液两相流均匀混合,且微气泡在水流中存在滑移,运用流体计算软件Fluent中的混合多相流模型对平板微气泡减阻过程进行数值模拟,研究了微气泡流的减阻机理及喷气速度与主流速度之比、微气泡大小、空隙率分布等对水中运动平板减阻效果的影响规律,并指出微气泡减阻率为喷气速度与主流速度之比的非线性对数函数,且存在相对饱和喷气速度,同时建立了一个平板微气泡减阻率大小的预报模型,并从理论上对减阻效果进行了预报。Supposing gas and liquid can equably mix, and gas can slip in the mixture flow, the mechanism of resistance reduction by micro-bubbles and the influencing factors on the resistance reduction, such as the ratio of gas injection velocity versus water speed, bulk of micro-bubbles and distribution of the void are analyzed by using mixture model and k-ε turbulence model in Fluent. The result shows that the resistance reduction ratio is a nonlinear logarithm function of ratio of gas injection velocity versus water speed, and a saturated relative gas injection speed exist, furthermore a prediction model on resistance reduction is also provided.

关 键 词：微气泡 空隙率 数值模拟 平板 减阻 

分 类 号：U661.3[交通运输工程—船舶及航道工程]