形态/材料耦合仿生功能表面减阻特性及机制

模仿海豚皮肤特殊结构的形态/材料耦合仿生功能表面可有效降低流体机械表面阻力,是流体机械实现节能减排的研究热点。该文采用流固耦合模拟技术,针对上述功能表面的面层材料及基底仿生形态2种耦合因素,各取3种不同的数值模型,对其减阻特性进行研究。计算结果表明：面层材料的弹性模量及基底仿生形态的间距对其减阻特性影响较大;面层材料的弹性模量越小,其顺应流体介质的能力越强,减阻效果越好;基底仿生形态的间距对于黏性阻力的影响效果显著,当间距为2 mm时,其减阻效果最好。减阻机制主要体现为：仿生耦合功能表面面层材料的弹性变形导致其实际流固接触界面与流固耦合界面产生分离,使其表面速度梯度降低,从而实现表面摩擦阻力的...

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Bibliographic Details
Published in农业工程学报 Vol. 31; no. 13; pp. 10 - 16
Main Author 田丽梅 可庆朋 金娥 李子源 王银慈 胡彦冰
Format Journal Article
LanguageChinese
Published 吉林大学工程仿生教育部重点实验室，长春 130022 2015
吉林大学生物与农业工程学院，长春 130022%吉林大学生物与农业工程学院,长春,130022
Subjects
仿生
减阻
模拟
耦合
couplings
模拟
减阻
仿生
drag reduction
bionics
耦合
fluid-solid coupling
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2015.13.002

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Summary:模仿海豚皮肤特殊结构的形态/材料耦合仿生功能表面可有效降低流体机械表面阻力,是流体机械实现节能减排的研究热点。该文采用流固耦合模拟技术,针对上述功能表面的面层材料及基底仿生形态2种耦合因素,各取3种不同的数值模型,对其减阻特性进行研究。计算结果表明：面层材料的弹性模量及基底仿生形态的间距对其减阻特性影响较大;面层材料的弹性模量越小,其顺应流体介质的能力越强,减阻效果越好;基底仿生形态的间距对于黏性阻力的影响效果显著,当间距为2 mm时,其减阻效果最好。减阻机制主要体现为：仿生耦合功能表面面层材料的弹性变形导致其实际流固接触界面与流固耦合界面产生分离,使其表面速度梯度降低,从而实现表面摩擦阻力的降低。
Bibliography:bionics; couplings; drag reduction; fluid-solid coupling
11-2047/S
In the present study, a drag reduction on bionic surface originally inspired by the dolphin skin was designed and constructed. Two factors are coupled together with this bionic surface, they are bionic form processed on the basal rigid material and elastic surface material coupling on the bionic form. Such surface was called form/elastic material bionic coupling functional surface（BCFS） in this paper. The BCFS has been used in the impeller surface of centrifugal pump and proved to have the function of drag reduction. However, because of the limitation of existing test equipment, the drag reduction characteristics and mechanism of such BCFS can＇t be revealed effectively. As such it greatly affects the wide application of the BCFS. Thanks to the gradually maturing fluid-structure coupling simulation technology, it makes the fluid control research by the BCFS possible. The two-way fluid-structure coupling simulation method was used under the ANSYS-
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2015.13.002