drag flow 中文意思是什麼
drag flow
解釋
沿壓力方向的流動-
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 -
Since these theoretical analyses are based on inviscid potential flow theory, theoretical calculation and computational simulation may complement each other. the hydrodynamics and undulating propulsion of specimens were studied using three dimensional computational fluid dynamics ( cfd ) modeling. the cfd analysis using kinematic model of undulatory dorsal / median fin draws a series of conclusions, which include that the body drag increases significantly with the lateral body oscillation ; the body drag is minimum while the start point of
計算結果表明游動過程中的形體阻力隨側向周期性擺動而增大;當背鰭前端位於身體側向最寬處時，形體阻力具有局部最小值，結論與實驗觀測結果相吻合;在實驗觀測的典型運動參數下，波動面的運動方程中的非對稱因素的出現使推進力增大約1 . 10倍。 -
Numerical simulation of drag force on non - spherical particle in gas - particle two - phase flow
氣固兩相流動中非球形顆粒所受曳力的數值研究 -
Firstly, based on the present research all over the world, a 3d quasi - single phase model is built together with k - equations. the special feature of this model is taking account of the influence of interaction between liquid and gas, that is to say, the influence of interphase drag force, lifting force perpendicular to the relative velocity, virtual mass force and gas or liquid volume fraction in the fluid field have been considered. a 3d two - fluid model is also built in order to describe more accurately the fluid flow on distillation trays by comparing the computational results of quasi - single phase mathematical model with of two - fluid mathematical model
本文在國內外已有的研究基礎上，首先建立了以k - （封閉模型為基礎的三維擬單相流模型，該模型的特點在於充分考慮了氣液兩相間相互作用的影響，即計入了相間曳力、橫向升力、虛擬質量力和氣、液相含率對流場的影響；並建立了塔板三維雙流體模型，主要目的是通過對比擬單相流數學模型、雙流體數學模型的計算結果，建立能夠準確描述塔板上流體流動的數學模型。 -
According to dynamical characteristic of the bubble motion in the flow field, and under the assumptions of isothermal system without interior heat source, uniform bubble size, and ignoring surface tension, the mathematical expressions for interfacial momentum exchanges have been deduced which include drag, virtual mass force, and lift
針對氣液泡狀流中氣泡運動力學特性，在系統絕熱、無內熱源、忽略表面張力、氣泡尺寸均一前提下建立了氣液相間曳力、虛質量力、升力的數學模型表達式。 -
The equipment adopts centrifugal sliding plow groove rotor and is the newest structure evaporator at present. it can form membrane under the condition of small flow. comparing with that of fixed space drag evaporator, its evaporation capacity can increase 40
本設備採用離心式滑動溝槽轉子，是目前國外最新結構蒸發器，在流量很小的情況下也能形成薄膜，在簡體蒸發段內壁表面附著處理液中的淤積物可被活動刮板迅速移去，和固定間隙的刮板蒸發器相比，蒸發量可提高40 69 。 -
Drag force characteristics and calculation of water flow around pile
樁柱水流繞流阻力特性及其計算 -
Individual dislocation - solute interactions are extrapolated to ensemble effects, including " upper yield points " during mechanical testing, serrated flow, strain aging, and viscous drag
由個別的差排溶質交互作用推衍到整體效應，包含機械測試時之上降伏點、鋸齒狀應力-應變行為、應變時效及黏滯力。 -
( 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 ) using conformal mapping, the longitudinal protrusion height and the lateral protrusion height on the v - grooved surfaces are given, on this basis, some drag reducing features in parallel - flow, cross - flow and enlarge - flow are presented and analyzed ; in addition, drag reducing features with blade - shaped grooves and u - shaped grooves are discussed, consequently, the riblets designing criterions are suggested which will reduce the drag and noise most effectively underwater
（ 3 ）利用保角變換方法求出v ?型條紋的縱向和橫向突出高度，在此基礎上得出縱向流、橫向流和帶角度流動時的降阻特性，並分析結果；而且分析了葉片型條紋和u ?型條紋表面上的降阻情況，提出水下具有最佳降阻效果的條紋表面設計準則。 -
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。 -
According to the character of outer shape of modem buses, the numerical calculations are performed from the simplest shape - cuboid by using ansys / flotran software. first, the foreside of the cuboid is modified step by step in 17 models ( this is equal to the process of modification to the foreside of a bus ). second, the afterbody of the cuboid is modified step by step in 9 models to model flow wake at rear end and get the drag coefficients and lift coefficients in different aterbodies
在本文中，應用ansys flofan軟體，根據現代客車外形的特點，從最簡單的長方體開始進行數值模擬計算，首先對長方體的前部進行逐步改造（相當于對一個客車頭部進行改造的過程） ，這一步驟包括了17個模型；然後再對其尾部進行變化，以模擬客車后車體形狀對空氣阻力系數的影響，該步驟包括9個模型：最後給出兩種現代客車的數值模擬結果。 -
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。 -
The effect of mesh - addition on the turbulence spatial structure of drag - reducing flow
添加篩網對減阻流體湍流空間結構的影響 -
Most of the tools use some kind of click - and - drag flowchart motif to model control flow
大多數工具使用一些拖拉式的流程圖來模擬流程式控制制。 -
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。 -
The bionic non - smooth technique was applied to the centrifugal water pump to modify the liquid flow structure in the pump to reduce the hydraulic drag in the liquid - solid interface, resulting in the enhancement of the pump efficiency
摘要基於仿生非光滑技術，通過改變離心式水泵中液體的流動結構降低固液界面的阻力，研究了水泵的增效問題。 -
The paper researches the transient time precision and the following problem of the results developing with time for 2 - d high order blocking and matched method, at the same time, anlysing the stability of high order methods including boundary conditions. the results show that the domain decomposition and matched method using high order method can follow the time developing solution of taylor problem well, the computation result of the flow over a single or two tandem arranging circular cylinder agree the experiment and others " results well, moreover, the panting results of lift and drag coefficient are better than others
本文利用高精度分塊耦合求解方法，對其瞬態時間精度和非定常時間發展解的跟隨性問題進行了研究，同時也對包含邊界條件的線法高精度格式的穩定性也作了分析，研究結果表明高精度的分塊耦合求解方法可以很好地跟隨taylor問題的時間發展解，與單圓柱繞流和雙圓柱繞流的實驗結果比較以及他人結果比較符合很好，對升阻力系數在渦脫落時的脈動問題的結果優於他人結果。 -
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 -
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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