turbulent drag 中文意思是什麼

turbulent drag 解釋
湍流阻力
  • turbulent : adj. 1. 激流的;湍流的。2. 騷亂的;強橫的。
  • drag : vt ( gg )1 拖,曳;拖動,拖著(腳、尾巴等);硬拖(某人)做(某事)[至(某地)]。2 打撈,(用撈...
  1. The effect of reynolds number on rudder hydrodynamic performance is also analyzed. up to the stall angle the computed lift and drag agree well with measurements and other author ' s calculations, whereas stall angle, lift and drag beyond the stall angle are slightly under - predicted. the solver is used to investigate laminar and turbulent separated flows around a 6 : 1 prolate spheroid at high incidence angles and their effects on hydrodynamic forces

    應用所開發的求解器,以naca0015翼型舵為算例計算了船舵在不同雷諾武漢理三;大學博士學位論文數下大舵角范圍內的三維粘性流場及水動力,成功地預報了舵的失速角和最大升力,並初步探討了雷諾數對舵水動力的影響;計算結果與現有試驗和計算數據比較,吻合程度相當好,初步檢驗和驗證了該求解器精確模擬粘性流動和計算水動力的能力。
  2. A study of turbulent flow drag reduction by large eddy break - up devices

    湍流大渦破碎裝置的減阻研究
  3. When the flow of fluids in channels or pipes changes from laminar to turbulent as speed of the flow is increased, there is a large increase in drag

    流體,如我們常見的水,在管道里流動時,會隨著速度的增加,由規則的層流轉為貌似毫無規律的湍流。
  4. In the thesis the low drag - low noise optimization of the vehicle main form design is realized, main accomplishments are as follows. researched the knowledge of drag and flow noise, the parameters of the boundary layer are calculated by the hess - smith method and boundary layer momentum integral method. the calculation of the length of transition zone and change in boundary layer displacement thickness between laminar and turbulent states in the transition is improved, then the drag coefficient and self - noise from the transition zone are calculated as the objective functions of the optimization

    主要研究內容和成果如下:對航行器繞流流場進行分析,深入研究了阻力和流噪聲產生機理,建立了阻力系數和自噪聲的評估數值計算模型;採用物面分佈源匯法和邊界層動量積分法對繞流流場的流體動力參數進行計算,改進了轉捩區長度和邊界層位移厚度的計算,應用於航行器頭部駐點自噪聲的計算;最後設計了阻力系數和自噪聲數值計算程序模塊。
  5. Based on theoretical analysis, microbubble drag reduction is due to structure change of turbulent boundary layer caused by the microbubbles. experiments testify microbubble drag reduction for turbulent boundary layer, as well as bubble size, main flow velocity, etc. affecting the reduction ; with proper flow field model, turbulent model and difference scheme, numerical methods simulate the effect of boundary layer and bubble numbers on dray reduction

    理論分析提出微氣泡降阻機理在於其引起湍流邊界層結構的變化;實驗證明了微氣泡對湍流邊界層的降阻作用以及氣泡尺度、主流速度等對降阻作用的影響;數值方法利用適當的流場模型、湍流模型和差分格式,模擬邊界層和氣泡數等對降阻的影響。
  6. Topics include the principles of conservation of mass, momentum and energy ; hydrostatic behavior of floating and submerged bodies ; lift and drag forces ; dimensional anaylsis ; wave forces on ships and offshore platforms ; laminar and turbulent flows

    主題涵蓋質量守恆、動量守恆及能量守恆等原理、浮體及沈體之流體靜力行為、升力、拖曳力、因次分析、船舶及離岸平臺上作用的波力、層流及紊流。
  7. Based on prandtl ' s momentum transportation, this paper calculates in detail the physical quantities such as eddy viscosities, and ratio of eddy viscosity to motion viscosity, total stresses with respect to relative position in three regions of viscous sub - layer, buffer layer, and main turbulent stream for non - newtonian fluid flowing turbulently in ducts, which according to karman ' s three layer models and measurement of fluid parameters in evaluation apparatus, discusses the influence of polymer drag reduction on flowing properties of non - newton fluid, analyzes quantitatively principle of turbulent reduction phenomenon and condition of increasing reduction rate

    摘要以普蘭德動量傳遞理論為基礎,按照卡門的三層模型,通過室內模擬環道用0號柴油及加入減阻劑在圓管內的流動參數的測定,計算了非牛頓型流體管內湍流邊界層的層流內層、過渡層、湍流中心的渦流粘度,渦流粘度與運動粘度比、總應力隨相對位置的變化等定量參數,探討了高分子減阻劑對非牛頓流體流動特性的影響,對湍流減阻現象的機理與增大減阻率的條件進行了定量分析。
  8. Mechanism of drag reduction by spanwise wall oscillation in turbulent channel flow

    壁面展向周期振動的槽道湍流減阻機理的研究
  9. Experimental investigation of drag reduction mechanism over compliant wall and multi - scale coherent structure control in turbulent boundary layer

    柔性壁面湍流減阻機理與多尺度相干結構控制的實驗研究
  10. The 3d turbulent flow fields around high - speed trains of four kinds of model uain have been calculated by 3d parallel compute program coded with the algorithms presented in this thesis. from the calculation results, the aerodynamic drag of different types of model trains are obtained, some characteristics of the flow field over the high - speed train are analyzed preliminarily such as pressure distribution and diversification, velocity distribution and diversification, and the affections of different train head shape to pressure. velocity, pressure gradient and the like

    用三維并行計算程序模擬了四種不同高速列車車型的外流場,獲得了不同車型的運行阻力;詳細分析了列車附近流場的壓力分佈及其變化情況,討論了列車頭型對列車通過時產生的壓力波動的影響;分析了四種車型外部流場的速度分佈規律及其變化情況,分析了列車頭部形狀對它們的影響。
  11. Recently, one of her research focus is on understanding the intriguing and practically important phenomenon of drag reduction by polymer additives in turbulent flows

    最近,她的其中一項研究工作是理解高分子在湍流中減阻這一有趣而有重要實用性的現象。
  12. All of the results indicated the turbulent boundary layer had been turned into the laminar layer. the skin friction coefficient drops rapidly. this result not only proved the phenomenon of reverse transition had occurred, but also showed that this condition was drag - reducing condition

    實驗結果表明板面附近的流動已由湍流流動轉變為層流流動,同時平板表面的摩擦系數較沒有溫度梯度時有大幅度下降,不僅證明了邊界層逆轉捩現象的存在,也說明了這種條件起到了減阻的效果。
  13. The drag reduction of riblet biomimetic non - smooth surface is given out by numerical simulation with cfx. through analysis of velocity vector field and velocity fluctuation this article probe into drag reduction mechanism of unsmooth surface. through analysis of behavior of single microbubble and turbulent kinetic energy this article indicate drag reduction mechanism of microbuble

    對仿生非光滑表面減阻機理,採用流體力學分析軟體cfx進行了數值模擬,通過對速度場、剪切應力、渦量的計算結果進行分析,得出了仿生非光滑表面減阻幾種主要原因。
  14. Effect of drag reducing grooved surface on high - order moments in turbulent boundary layer

    減阻溝槽表面對湍流邊界層高階矩特性的影響
  15. Moreover, this paper investigates the influences of surfactant aqueous solutions on flow characteristics of a mmc. sodium dodecyl sulphate aqueous solution and alkyl polyglycoside aqueous solution are used as working fluids. the experiment results indicate that the drag reduction depends on flow velocity and temperature ; the drag reduction effects aren ’ t very obvious in laminar flow region, but when fluid enter turbulent flow region, the drag reduction increase notably, the drag reduction effects

    研究結果表明,阻力減小率( dragreduction , dr )與流速和溫度有關;層流區內表面活性劑的減阻效果不是特別明顯,但進入紊流區后減阻效果開始增強,尤其進入旺盛的紊流區后減阻效果大大增強;溫度提升也可增加dr ,但在溫度較高時添加sds后減阻效果的改善卻不及apg 。
  16. The fact that grain of sand is fine or silty, with thin layer and little - scale scours means that the water energy was low. grain analysis tells its transiting character between turbulent flow and drag flow with the same character as sub - fan. in the core, every sequence is positive rhythm and debris flow that is not developed in delta was also found

    巖電關系分析表明,孔隙度與聲波時差成正相關關系,與自然伽瑪呈負相關關系,而滲透率與孔隙度具有較好的指數關系,據此建立了解釋模型,在測井數據標準化的基礎上進行了測井解釋,較為準確地反映了井點處的物性特徵。
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