drag reduction 中文意思是什麼

drag reduction 解釋
減曳作用
  • 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...
  • reduction : n 1 縮小，減少；降級，降位；（刑罰等的）輕減；減速；減價，折扣。2 （城市、國家等的）陷落，投降，...
  1. 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
  2. ( 4 ) the drag reduction of plane - surfaces with v - shaped grooves is given out by direct numerical simulation, and the drag reduction mechanism in the base of the secondary flow theory is suggested

    （ 4 ）利用直接數值模擬方法求得平板上v ?型條紋表面上的降阻情況，並給出基於二次流動理論的降阻機理。
  3. 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。
  4. 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。
  5. 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
  6. By analyzing flow status of fluid in aerating pipeline, giving up hydraulics and utilizing hydromechanics and advance numerical calculations, the prediction method to solve optimizations height on flow status in aerating pipeline is studied and put forward, which provides a scientific theory base to realize effective drag reduction and economic principle in blend phase transportation for pipeline design

    摘要通過分析摻入少量高粘流體形成分層紊流層流的流動狀態，拋棄傳統的水力學研究方法，應用流體力學原理、高級程序設計語言和先進的數值計算技術研究了摻入少量高粘流體分層紊流層流減阻規律，為實現管道混相輸送時高效減阻和經濟節約的設計提供理論依據。
  7. 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
  8. In addition, drag reduction characteristics in the transition regime of channel suspensions are studied

    最後應用穩定性分析結果分析槽流懸浮流失穩階段的減阻特性。
  9. We generated its grid surface on the fuselage or missile body according to the geometry projection relation between aerodynamic components and the bilinear interpolation approach. finally, we successfully developed a new algebra grid generation technique in virtue of the improved four - boundary interpolation. in this thesis, we put emphasis on the researches of aerodynamic inverse design and drag reduction questions for airfoil and wing using euler equations and control theory proposed by jameson

    （ 2 ）進行了應用控制理論和二維歐拉方程的翼型氣動反設計，以及有升力約束情形下翼型跨音速減阻問題研究，分別推導了相應的共軛方程及邊界條件的數學形式，並給出了相應的梯度求解公式形式，研究發展了共軛方程及梯度的數值求解方法，成功進行了多個翼型的反設計和減阻問題研究。
  10. 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。
  11. Behavior of drag reduction for ctab surfactant aqueous solution

    表面活性劑水溶液的減阻特性
  12. Drag reduction by polymers

    聚合物減阻
  13. Experimental study of the drag reduction of ventilated supercavity of underwater bodies

    水下航行體通氣超空泡減阻特性實驗研究
  14. Experimental studies on drag reduction of the circular cylinder with an upstream rod in tandem

    採用上游擾動體被動控制減阻技術的實驗研究
  15. Lab test method for the drag reduction performance of drag - reducing agent which applied in oil pipeline transportation

    輸油管道減阻劑減阻效果室內測定方法
  16. Experimental study and numerical simulation on drag reduction of the underwater vehicle based on surface profile design

    基於表面設計減阻的水下航行體模型實驗與數值分析
  17. Coinciding conclusion is obtained through these methods, and this provides strong background for further engineering application of microbubble drag reduction

    這些研究得到了較為一致的結論，為未來微氣泡降阻的工程應用研究奠定基礎。
  18. 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。
  19. In this paper, a theoretical investigation of the drag reduction for underwater submarine by riblet biomimetic non - smooth surface and microbubble carried out, the prime mechanism of two drag reduction technology is open out, and provide theoretical foundation for engineering, which proved efficiency of thruster

    粘性摩擦阻力在低速前進時對航行器的阻力起主導作用，而在高速航行時壓差阻力是主要的，因此在設計當中綜合考慮了兩方面因素，使表面結構具有雙重減阻特性。
  20. It is found that drag reduction occurs with adequate wavenumbers and grows with an increase of h. the mechanisms are revealed through variations of velocity profile and the decrease of wall shear stress

    分析減阻機理是流速分佈曲線及近壁區速度梯度介於層流與湍流之間， h值增大引起壁面剪應力顯著下降。
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