回转体微气泡减阻影响因素理论研究  

The theoretical study on influencing factors to resistance reduction of a gyroidal object by microbubbles

作　　者：郭峰[1,2] 董文才[3] 毕毅[3] 

机构地区：[1]海军92854部队监修室 [2]海军装备研究院舰船论证研究所 [3]海军工程大学船舶与动力学院

出　　处：《哈尔滨工程大学学报》2010年第11期1443-1449,共7页Journal of Harbin Engineering University

基　　金：全国优秀博士学位论文专项资金资助项目(200551)

摘　　要：为了研究影响回转体微气泡减阻率大小的因素,运用Fluent 6.3软件对某回转体微气泡减阻模型进行了数值计算,分析了喷气速度与来流速度的比值、喷气角度、气泡尺度及空隙率分布等因素对减阻率的影响程度和规律,初步揭示了微气泡减阻的机理,研究了饱和喷气量的形成原因.结果表明,微气泡可使回转体局部摩擦阻力减少80%,总阻力减少约30%;微气泡减阻率的高低主要由喷气速度与来流速度之比、近壁面处空隙率的大小及分布所决定,而与喷气角度以及一定范围内的气泡尺度关系不大;喷气流量增大,摩擦阻力下降,粘压阻力增加,当摩擦阻力减少量与粘压阻力增加量相当时,达到饱和气量.在喷气流量未达到饱和值时,总阻力随气流量的增大而减少.In order to investigate influencing factors to resistance reduction, the microbubble drag reduction in a gyroidal object was investigated numerically by using FLUENT 6.3 software. The relationship between the ratio of drag reduction and air injection parameters, such as velocity and angle of air injection, the bulk of the bubbles and the distribution of void fraction was discussed. The formation of the saturated air flow rate was also analyzed. It is shown that the microbubbles can reduce local friction resistance at maximum range of 80%, total resistance at maximum range of 30%, the resistance reduction ratio is mostly decided by the ratio of air injection velocity versus liquid velocity, and distributing of void fraction, is not closely related to the angle of air injection and the bulk of the bubbles at certain ranges. As air flow rate increases, the friction resistance reduces, but the viscosity pressure resistance increases, when the reduction magnitude of frictional resistance approaches the increase value of viscosity pressure resistance, the air flow rate comes to saturated value. The total resistance decreases as the air flow rate increases, when the air flow rate is less than the saturated value.

关 键 词：回转体 微气泡 空隙率 减阻 

分 类 号：U661.3[交通运输工程—船舶及航道工程]