發(fā)布時(shí)間：2018-12-13 01:24

【摘要】：隨著社會(huì)的不斷進(jìn)步和發(fā)展,能源的緊缺正日益成為人們關(guān)注的焦點(diǎn),如何節(jié)約能源成為了當(dāng)下亟需解決的社會(huì)問題。飛機(jī)、汽車、船舶等的運(yùn)行均需要消耗極大的能源,所以通過合理的設(shè)計(jì)來降低各類交通運(yùn)輸工具的表面摩擦阻力就成為了一種有效的節(jié)能手段。將仿生學(xué)運(yùn)用到減阻領(lǐng)域是近來國(guó)內(nèi)外研究的熱點(diǎn)。模仿鯊魚鰓部射流行為,提出了一種新型的仿生減阻形式,即仿生射流減阻。在此基礎(chǔ)上,建立仿生射流模型,重點(diǎn)研究了仿生射流孔形狀及尺寸對(duì)減阻效果的影響。本文從工程實(shí)際出發(fā),在對(duì)鯊魚原型進(jìn)行充分研究的基礎(chǔ)之上,將鯊魚鰓部的生物原型進(jìn)行合理的簡(jiǎn)化之后抽取出來,建立了仿生射流模型。以單孔平板射流為研究對(duì)象,利用GAMBIT軟件對(duì)模型進(jìn)行合理細(xì)致的網(wǎng)格劃分,利用FLUENT對(duì)模型進(jìn)行數(shù)值模擬。在合理選擇了湍流模型、初始條件、邊界條件等的基礎(chǔ)上,得到了較精確的數(shù)值結(jié)果。進(jìn)而分析比較了不同長(zhǎng)寬值的矩形射流孔、形狀改進(jìn)優(yōu)化后的射流孔以及不同曲率的圓弧形射流孔對(duì)減阻效果的影響,得到了形狀尺寸因素對(duì)減阻效果的影響規(guī)律和最佳減阻效果的射流孔尺寸形狀,并分析了其減阻機(jī)理。在不同的流場(chǎng)條件下,分析比較不同形狀尺寸射流孔的減阻情況,分析不同主流場(chǎng)、射流速度下各種射流孔的減阻機(jī)理。建立了射流系統(tǒng)的節(jié)能特性評(píng)價(jià)標(biāo)準(zhǔn),從系統(tǒng)總能耗的角度分析了典型仿生模型的節(jié)能特性。最后,以部分有代表性的射流孔為依據(jù),加工出試驗(yàn)樣件,利用小型減阻測(cè)試試驗(yàn)裝置進(jìn)行實(shí)驗(yàn)驗(yàn)證,并分析比較數(shù)值模擬數(shù)據(jù)與實(shí)驗(yàn)數(shù)據(jù)誤差。
[Abstract]:With the continuous progress and development of society, energy shortage is becoming the focus of attention. How to save energy has become a social problem that needs to be solved. The operation of aircraft, automobile, ship and so on all need to consume a great deal of energy, so it becomes an effective energy saving means to reduce the surface friction resistance of all kinds of transportation tools by reasonable design. The application of bionics to the field of drag reduction has been a hot topic at home and abroad recently. A new bionic drag reduction form, bionic jet drag reduction, is proposed, which mimics the behavior of shark Gill jet. On this basis, the bionic jet model was established, and the influence of the shape and size of the bionic jet hole on the drag reduction effect was studied. Based on the research of shark archetype, the bionic jet model of shark Gill is established by reasonably simplifying the biological prototype of shark Gill. Taking the single hole flat jet as the research object, the model was meshed reasonably and meticulously by using GAMBIT software, and the model was simulated numerically by FLUENT. On the basis of reasonable selection of turbulence model, initial conditions and boundary conditions, more accurate numerical results are obtained. Furthermore, the effects of rectangular jet holes with different length and width, optimized jet holes with improved shape and circular curved jet holes with different curvature on drag reduction are analyzed and compared. The influence of shape and size factors on drag reduction effect and the size shape of jet hole with the best drag reduction effect are obtained, and the drag reduction mechanism is analyzed. Under different flow field conditions, the drag reduction mechanism of various jet holes with different shape and size is analyzed and compared, and the drag reduction mechanism of various jet holes in different mainstream field and jet velocity is analyzed. The evaluation standard of energy saving characteristics of jet system is established, and the energy saving characteristics of typical bionic model are analyzed from the point of view of total energy consumption of the system. Finally, based on some representative jet holes, the experimental samples are manufactured, and the experimental results are verified by a small drag reduction test device, and the error between the numerical simulation data and the experimental data is analyzed and compared.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB17;TB126

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本文編號(hào)：2375605