本文選題：仿生波動(dòng)鰭　切入點(diǎn)：鰭條　出處：《工程設(shè)計(jì)學(xué)報(bào)》2017年01期 　論文類型：期刊論文

【摘要】：仿生波動(dòng)鰭的鰭條運(yùn)動(dòng)模式分為等幅和變幅兩種類型,通過實(shí)驗(yàn)發(fā)現(xiàn)這2種鰭條運(yùn)動(dòng)模式下所產(chǎn)生的游動(dòng)性能存在著較大的差異.為了揭示這種差異存在的內(nèi)在緣由,建立基于鰭條這2種運(yùn)動(dòng)模式的仿生波動(dòng)鰭運(yùn)動(dòng)學(xué)方程.利用計(jì)算流體動(dòng)力學(xué)原理,比較不同運(yùn)動(dòng)學(xué)參數(shù)下2種運(yùn)動(dòng)模式鰭面壓力分布情況,分別給出2種模式下波動(dòng)鰭產(chǎn)生的無量綱阻力系數(shù)隨時(shí)間的變化情況以及無量綱阻力系數(shù)時(shí)間平均值隨頻率、擺幅和波長的變化規(guī)律,給出魚鰭模型中部沿鰭條方向切面的速度場和壓力場.結(jié)果表明:2種模式下產(chǎn)生的推進(jìn)力均隨頻率、擺幅和波長的增大而增加,但等幅擺動(dòng)產(chǎn)生的推進(jìn)力始終小于變幅擺動(dòng);2種模式下模型中部切面的速度場和壓力場存在明顯的差異,而尾跡二維渦量場結(jié)構(gòu)和分布形態(tài)十分相似,說明影響2種模式游動(dòng)效果的主要原因之一來自于沿鰭條方向的差異.結(jié)論進(jìn)一步闡述了依賴魚鰭波動(dòng)推進(jìn)的水生生物體高效游動(dòng)的本質(zhì),也為研制高性能的仿魚鰭波動(dòng)推進(jìn)裝置提供了參考.
[Abstract]:The motion patterns of bionic undulating fins can be divided into two types: equal amplitude and variable amplitude. It is found that there are great differences in swimming performance between the two kinds of fin motion modes. A bionic wave fin kinematics equation is established based on the two motion modes of fins. The pressure distribution on the fin surface of the two motion modes under different kinematic parameters is compared by using the principle of computational fluid dynamics (CFD). The variation of dimensionless drag coefficient with time and the variation of the mean value of dimensionless drag coefficient with frequency, swing amplitude and wavelength under two different modes are given, respectively. The velocity field and pressure field along the tangent plane along the fin direction in the middle of the fin model are given. The results show that the propelling force generated by the two modes increases with the increase of frequency, swing and wavelength. However, the propelling force produced by the constant amplitude swing is always smaller than that of the variable amplitude swing. The velocity field and the pressure field in the middle of the model have obvious differences, while the structure and distribution of the wake two-dimensional vorticity field are very similar. It is shown that one of the main factors affecting the swimming effect of the two models comes from the differences along the fin stripe. Conclusion the essence of efficient swimming of aquatic organisms dependent on fin fluctuation and propulsion is further expounded. It also provides a reference for the development of a high performance fin wave propulsion device.
【作者單位】： 臺(tái)州職業(yè)技術(shù)學(xué)院機(jī)電工程學(xué)院;
【基金】：浙江省自然科學(xué)基金資助項(xiàng)目(LY15E060001) 臺(tái)州職業(yè)技術(shù)學(xué)院一般課題(2015YB02)
【分類號(hào)】：TB17

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