turbulent flow velocity 中文意思是什麼
turbulent flow velocity
解釋
湍流速度場-
A test analysis of open canal bottom coefficient of roughness anticlimax on turbulent velocity of flow and intensity of turbulence influence
明渠渠底糙率突減對紊流流速及紊動強度影響的試驗分析 -
By performing fourier transformation, the relationship between the turbulent intensity of the particle and that of the carrier fluid was obtained which makes clear that particle size, specific gravity, velocity gradient, and the characteristic frequency of energy - containing eddies are four basic influencing parameters. it is proven theoretically that under certain conditions, the stream - wise and transverse particle turbulent intensities exceed those of the carrier fluid. based on the equations of two - phase flow, the presence of fine sediment suspension is shown to attenuate the turbulent intensity of the water
通過對細小顆粒在剪切流場中運動方程的fourier分析，得到了顆粒脈動強度和流體脈動強度之間的定量關系，表明顆粒粒徑、顆粒密度、流速梯度以及紊動場含能旋渦的特徵頻率是影響顆粒脈動強度的主要因素，首次從理論上證明了在一定條件下，顆粒在縱、垂向的脈動強度均會超過相應的流體脈動強度，為已有的實測資料提供了合理的解釋。 -
With piv technology, the flow field was measured to judge the performance of pump sump. by analyzing the pictures of velocity, streamline, turbulent kinetic energy and vorticity, we found that the turbulence was bigger while the ratio of the runoff increased. and the vortices always appeared in the field where the runoff was small
通過piv試驗，測量了封閉式水泵吸水室內部的流場，以研究該水泵吸水室的性能； （ 2 ）通過分析流速圖、流線圖、湍動能圖和渦量圖，發現了流量比越大，湍動越大，漩渦總是出現在流量較小的一側。 -
The temperature field along the axis, axial velocity, the turbulent energy, and the concentration of the particles were investigated when the temperature field varied. the numerical experiment shows that the thermophoresis force changes the concentration of the 2 - micron particle, decreasing in the main flow and increasing in the near - wall region
數值實驗的結果表明在兩相流模型中添加熱泳力源項會對2微米顆粒在流場中的濃度分佈有很大的變化，主流區的顆粒濃度降低，近壁區顆粒濃度在溫差不大的時候，提高幾十倍。 -
The distributions of velocity vector, vorticity. turbulent kinetic energy and some other detailed flow information in the field are obtained. the influence of electric field on the flow field is discussed and gives a deep insight on it
3 、首次採用piv技術對荷電噴霧射流流場進行了測量，獲得了整個流場的瞬時速度、湍能、渦量等信息分布圖，研究了流場特性隨充電電壓的變化情況。 -
Threaded seat rings in valves in services with high velocity ( turbulent ) flow or thermal cycling should be lock welded to the body to avoid loosening. please specify
當用於高速流體（湍流）或熱循環應用時，為了避免松開，螺紋閥座環應該鎖焊在閥體上。請在訂購時加以指定說明。 -
Threaded seat rings for valves in services with high velocity ( turbulent ) flow or thermal cycling should be lock welded to the body to avoid loosening. please specify
如果閥門用在高速流體（湍流）或熱循環應用環境中，則螺紋閥座環應該鎖焊到閥體上，避免松落。請在訂購時加以指定說明。 -
The goal of this paper is to study fully developed turbulent pipe flow. with the aid of the tripping annulus at the inlet, based on the experimental investigation and numerical simulation, detailed researches on a few basic rules in pipe flow have been performed, such as mean velocity profile, relative intensity of turbulence, the log - law, von karman ' s constant and reattachment length, thus filling some gaps in the research work of predecessors and obtaining a far - reaching understanding
本文的目的就是利用入口擋環進一步探索充分發展的圓管湍流，通過實驗和數值模擬對圓管湍流的若干基本規律，如平均速度分佈、相對湍流強度、對數定律、馮?卡門常數和再附著長度等進行詳細的研究，以填補前人研究中的一些空白，並獲得更深入的了解。 -
The turbulent flow in open channel is tested with laser - doppler anemometer, in which the longitudinal time average velocity and fluctuating velocity of turbulent flow in open channel under the conditions of the sudden changes of roughnesses at different water depths are measured
摘要通過激光測速儀，對壁面糙率突變時的明渠紊流進行試驗，測量了糙率突變不同水深情況下明渠紊流的縱向時均流速和脈動流速。 -
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。 -
In this article, constituting some the equations which reflect the flow law and building and applying many mathematical models of physical and chemical reactions in the the plasma ignition : applying k - two equations turbulence model to calculate the turbulence parameter supplying simplied reaction systerm model and applying eddy break - up model and p - i thermal radiation model. with these reasonable simplied modles, numerically simulating the flow field in the plasma ignition. during the numerical simulation, applying the body - fitted coordinates for the complex geometry of the computional field ; using the mixing format to disperse the equations ; applying simplec algorithm method to solve the equations ; using above models and methods, it can get flow field distribution ; including temperature, pressure, turbulent kinetic energy and its dissipation rate, turbulent viscosity, velocity, density. these results are significant to design and improve the plasma ignition
本文旨在通過構造反映等離子點火器內部流動規律的基本方程組，建立描述等離子點火器內部的復雜物理化學過程機制數學模型：模擬等離子發生器內部燃燒的-雙方程湍流流動模型；模擬氣體燃料在燃燒時中化學反應的簡單化學反應系統模型；模擬等離子點火器內部湍流預混燃燒的漩渦破碎模型；模擬等離子點火器高溫燃氣及其壁面的p - i輻射換熱的模型等等，對模型進行一定的合理的簡化，然後數值模擬等離子點火器內部流場的流動。 -
The resonant three - wave model and laminar - turbulent velocity profile composed are used as a model of coherent structures in. turbulent flow. the forming and variation of turbulent coherent structures in the channel are simulated by the compact differential method with high accuracy and resolution derived in this paper
以共振三波和層-湍復合速度剖面作為湍流相干結構模型，採用文中所導出的高精度、高解析度的緊致差分方法，模擬了槽道流動在近壁區域湍流相干結構的形成和變化。 -
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。 -
3. the characteristics of boundary layer ' s transition, shape and separation are researched. the details as follows : ( l ) airfoil surface is turbulent boundary layer flows ; ( 2 ) velocity figure changed unsteady near the point of boundary layer separation due to randomicity of turbulent flow ; ( 3 ) the airfoil have better state of boundary layer separation and poor stall characteristics because of the upper surface of airfoil is flat
給出了該翼型的附面層特性：翼型表面基本為湍流附面層；在靠近附面層分離位置處，速度型形狀、特別是靠近翼型表面的底部速度型形狀變化不定，是湍流流動的隨機性所致；該翼型具有較好的附面層分離形態，但在失速迎角附近，附面層分離形態變化劇烈、失速特性差，是翼型上翼面形狀較為平坦所致。 -
In this paper, based on the navier - stokes equation and the k - turbulent model, the numerical simulation of the 3d turbulent flow in a centrifugal impeller, of which specific speed is 93. the distribution of the velocity and pressure in the blade - to - blade passage are presented at the design and off - design operating conditions. the simulation results were verifiable with the results measured by piv
本文基於n ? s方程和標準的k ?雙方程紊流模型，採用商用cfx - tascflow計算軟體對一離心泵葉輪模型進行了葉輪內部三維紊流數值模擬，得到了三個典型工況下、從輪轂到前蓋板每一個斷面上的速度和壓力分佈。 -
Based on the measured data, the change of the friction velocity of turbulent flow and the characteristics of the wall shear stress under different sudden roughnesses and different water depths are analyzed herein
通過實測資料分析不同糙率突變和不同水深的紊流摩阻流速變化情況和水流的壁面切應力的特點。 -
Airflow in cylinder exists in the form of turbulent flow. in order to calculate the convective exchange of cylinder, we have to know the characteristic length and the characteristic velocity of airflow
氣缸內氣流是以紊流形式存在，在計算氣缸對流傳熱時要知道氣流的特徵速度和特徵長度。 -
The paper presents a model of turbulent flow, which can exactly provide data of the characteristic length and velocity of turbulent flow
本文介紹的紊流模型能準確提供特徵速度和特徵長度參數的數值。 -
A better desired ventilation form is acquired by comparing the three efficiency values. on the basis of recently materials collected in the field at home and abroad, this paper adopts two - equation turbulence model by analysis and comparison, and sets up mathematical model to study three - dimentional indoor turbulent flow. control - volume method and power - law scheme is used to discrete these differential equations. according to semi - implicit method for pressure - linked equations ( simple algorithm ), author writes a general program in c language for simulation of the velocity profile, temperature and pollution concentration distributions of indoor airflow, and the writing, the debugging and the running of the program. all are completed in microsoft visual c + + 6. 0 environment
在收集國內外在這一領域內的大量資料的基礎上，通過分析與比較，採用了k -雙方程模型來研究室內氣流的濃度分佈，建立了描寫穩態的三維紊流室內氣流濃度分佈的數學模型，採用控制容積法和冪函數分佈方案來離散微分方程組，按壓力藕合方程的半隱式法（ simple ）演算法，用c語言編寫了計算室內氣流流場和溫度場、濃度場的通用程序，並在microsoftvisualc + + 6 . 0環境下對程序進行編制、調試與運行，並對調試工作做了探討與分析。 -
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 。
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