velocity in pipe 中文意思是什麼
velocity in pipe
解釋
管內流速-
Firstly, simulate flow field of rear smoke channel, plot velocity magnitude and ash concentration distribution in section of entry of heat pipe air preheater, compare with data which were measured in guiyang power station, verify simulation to be reasonable and right. secondly, simulate all kinds of factors which affect flow field ' s uniformity such as length, thickness, location of diffluent board, ash concentration, ash diameter, and so on, find the chiefly factors. thirdly, install guide board in curve channel in rear smoke channel, then simulate its " flow field, plot velocity magnitude and ash concentration distribution
在此基礎上模擬在冬夏兩季不同情況下，不同流速對熱管空氣預熱器壁面溫度的影響；然後對影響整個流場分佈的各種因素：包括分流板長度、厚度、偏離中心流道位置的偏離度、飛灰濃度、飛灰粒徑等因素進行數值模擬；最後提出在分流煙道轉彎處加裝導流板，並模擬加裝導流板后的流場分佈，得到下級空氣預熱器出口、熱管空氣預熱器進口處的斷面速度場分佈、濃度場分佈，以論證加裝導流板能達到流場均勻化的作用。 -
Laser, ultrasonic beam and microwave are used in non contacting level measuring systems. laser systems suffer from dirt, ultrasonic sensors are strongly affected by changes of the velocity of sound and usually a pipe is needed to couple the ultrasonic waves into the liquid tank, which is difficult when there is a high pressure or when explosion protection is necessary
壓力式液位測量系統原理簡單、成本低，但測量精度和應用場合有一定的局限性，超聲液位儀精度較高，但設備復雜，一般需要用導管將超聲波傳到被測的液體中，因而安裝維護較麻煩，激光測距系統對環境要求嚴格。 -
A reasonable position of driving nozzle helps to achieve the maximum material flow that also depends on other parameters such as backpressure, properties of conveyed material and driving gas. it is observed that, an increase of convergent section angle is harmful to the pneumatic conveying system, and also influences on the mass flow rate of conveyed material, the distribution of static pressures in injector and the pressure drops of conveying pipe. in addition, within a reasonable scope of air mass rate, increasing the driving jet velocity is more advantageous than enlarging the dimension of driving nozzle
試驗研究發現，氣體噴嘴位置對氣固噴射器的輸送能力影響最大，氣體噴嘴存在某一最佳位置，而這一最佳位置與背壓、輸送物料特性和輸送風特性相關聯；氣固噴射器的收縮角對其輸送能力、內部靜壓分佈和輸送管阻力特性均有適量影響，收縮角增大對整個輸送系統均不利；在適當的輸送風范圍內，提高氣體噴嘴出口速度比擴大氣體噴嘴尺寸更為有利，但氣體噴嘴出口速度過高會增加氣固噴射器和輸送管內的能量損耗，給輸送帶來不利的影響；系統背壓與氣固噴射器的氣體噴嘴出口速度的選取有關。 -
Based on the review, the fluid flow and heat transfer in the curved circular and rectangular pipes have been researched by employing perturbation method and numerical simulation with a physical model under the rotational orthogonal curvilinear coordinate in a rotating curvilinear pipe with multi - parameters. we firstly analyzed the fully developed fluid flow and heat transfer, mixed convection heat transfer, the development of flow and heat transfer in the inlet in different cross section ( circular, elliptical, annular and rectangular crossection ). the variations of the secondary flow, axial velocity, distribution of temperature, the friction force on the wall, the ratio of friction factor as well as the nusselt number with different dimensionless parameters had been examined in detailed
本文在總結和分析了一個世紀以來有關曲線管道流動和換熱特性的研究成果的基礎上，以旋轉正交曲線坐標系統下的多參數旋轉螺旋管道中的對流傳熱為物理模型，通過攝動方法和有限體積法，首次對各種截面（圓截面、橢圓截面、環形截面、矩形截面）旋轉曲線管道內充分發展流動的流動結構和傳熱特性（包括耦合對流傳熱特性）以及旋轉曲線管道開口段發展流動的流動結構和換熱特性進行了系統的數值模擬和理論分析，詳細討論了各種無量綱參數對管道內軸向速度分佈、二次流結構、溫度分佈、壁面摩擦力、摩擦系數比以及管道nusselt數的影響，獲得了若干創新性成果。 -
On the basis of published research of experts and scholars, relations among the velocity of water, that of solid particles and that of settling slurry have been established by the analysis of momentum transmission between water and solid particles in the upward inclined pipeline. then the calculation formulae for the upward - inclined - pipe hydraulic gradient are derived
本文在系統總結現有專家學者的研究成果基礎之上，通過分析向上傾斜管道輸送中清水與固體顆粒的動量傳遞過程，從動量守恆的角度建立了清水速度、固體顆粒速度和漿體流速之間的關系，進而推導出了向上傾斜管道輸送的水力坡度計算公式。 -
In the simulation of close water test, varied profiles of velocity of flow are obtained at different leakage location along the detected pipe, the variety values of the water level in the check well are acquired with time, consequently the location of the leakage can be judged
在閉水試驗時，通過模擬沿管道長度方向上不同滲水點的流速的變化，以及得出窨井出口處的水位隨時間的變化值，來判斷管段中最有可能出現滲漏點的位置。 -
Other aspects of the minimum velocity in a horizontal pipe for pseudo-homogeneity are discussed in chapter 11.
水平管中假均勻流體最小速度的其他方面在第十一章中予以討論。 -
With the different tripping annulus at the inlet, a new method of the distance definition from the wall was used to measure 35 mean velocity profiles on seven sections in the pipe length x / d = 125. 2
採用新的離壁距離標定方法，在入口處設有改變擾動強度擋環的條件下，利用熱線儀在管長x d約為125的范圍內完成了七個不同管流截面上的35個軸線方向速度分佈的測量工作。 -
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。 -
3 the design theories of cooling pipe of play down internal temperature of mass concrete about diameter, length, arrange method, rate of flow, current velocity, reduce heat time, temperature disparity to in and out, reduce heating result etc. 4 the theory of influence about concrete internal temperature and concrete crack because of transform of mixture ratio and pulverized fuel ash sophisticate quantity
西安建築科技大學博士生論文一;一;一一『一一一3降低大體積混凝土內部溫度常用的冷卻水管的管徑、長度、布置方法、水流量、流速、降溫時間、進出水口的溫差、降溫效果等的設計計算理論。 4配合比及摻加料對混凝土內部溫度和混凝土開裂的影響理論。 -
The conclusion is that inductive electromotive force, gotten from sensor with the distribution regularities of weighting function, is proportional to the average flow velocity in pipe and is not relevant to the distribution of flow velocity when flow velocity is non - central symmetry with the central axis. so electromagnetic flowmeter could solve the question of high accuracy in principles
得出按權重函數分佈規律的傳感器，在流速非中心軸對稱分佈時，感應電勢僅與平均流速呈正比，而與流速分佈無關的結論，從而從原理上解決電磁流量計了高精度測量的問題。 -
The main achievements are as follows : the theory models of defect mfl field are set up ; based on the magnetic dipole model and finite element model, the distribution of defect mfl field is simulated in the dissertation ; the component of flux density ( magnetic filed ) parallel to the surface of pipe is detected by a circumferential array of hall probes ; the factors including defect geometry parameters, defect surface angle and shape, pipe material, field intensity, vehicle velocity, background magnetization, operating pressure and remanent magnetization and so on influence the mfl signal characteristics
採用霍爾元件作為缺陷漏磁檢測傳感器，獲得管道軸截面漏磁場切向分量的漏磁信號；研究了缺陷外形尺寸、缺陷傾角和形狀、管道材質和磁化強度、檢測儀移動速度、管道背底磁場、管內壓力和剩磁對漏磁信號的影響。提出了各通道增益放大、各路漏磁信號偏離調整、波形微分、數字濾波和平滑等漏磁信號預處理方法；分析了等空間采樣的漏磁信號轉換為等時間采樣信號的必要性，研究了漏磁信號的小波去噪方法。 -
The paper introduces experience of selecting hydraulic calculation formula and illustrates calculation of critical velocity of flow ( or critical pipe diameter ) and friction loss of pressure pipe in tailings transport and how to select the formula with examples
介紹工程實踐中，選用水力計算公式的體會，對尾礦輸送中臨界流速（或臨界管徑）和壓力管道摩阻損失的計算以及如何選用公式分別作了舉例說明。 -
The study on moving velocity of solids in horizontal pipe of drainage system in buildings
建築排水橫管中固體物移動速度的研究 -
Relaxation factors are adopted. a program is produced to simulate swirling air flow in a horizontal straight pipe and compare with experiment data. the simulation prove that the modified k - model can predict the core, annular and wall regions near entrance and axial velocity far from entrance, but it ca n ' t predict tangential velocity well in weak swirling area far from entrance
編程計算水平圓管內螺旋氣流的流動參數並與實驗數據對比，結果表明修正-湍流模型在近入口處基本上能預測出中心區、環形區和近壁區的流動特性，在遠離入口弱旋流區域對軸向速度的預測符合實際情況，但是出現對周向速度修正過大的現象。 -
In this system, mean velocity pipe is applied to transform the air velocity signal into pressure difference signal, and then the pressure difference signal is input into pressure difference transmitter to realize the transform of the pressure difference signal from non - electricity signal to electric current, and through the resistance in the corresponding sampling circuit the electric current is transformed into voltage signal ; the thermocouple is used as the primary element to realize the transform from temperature signal to the voltage signal ; under the control of communication agreement module, diversified voltage signal is transported into computer by way of a / d conversion module, and then the monitoring software compiled beforehand is transferred to deal with all the voltage signals relatively, the result of which is conveyed to relative interface to display
該裝置具有三個特點：一是採用表面式測溫方法，有效地減少了元件的維護與損耗；二是採用工業控制計算機及信息就地採集、數據總線傳輸的方式，充分利用計算機和數據自動採集方面的技術，實現各種參數的在線測量，監測指標全面，能與dcs系統聯用，具有技術先進性和一定的前瞻性；三是採用顯示器配工業觸摸屏的顯示方式，為現場運行人員提供了簡單、易學、方便的操作模式。本裝置自2001年8月投入運行以來，有效地幫助、指導運行人員進行燃燒調整，對于鍋爐和機組的安全、經濟運行發揮了重要作用。 -
And the conclusion is that vita method is a more reasonable method in burst detection when the threshold value is between 0. 7 to 1. 0. in order to investigate the influence of transverse curvature of the wall, the direct numerical simulated data bank of turbulent channel flow is also analyzed. the mean velocity profile in pipe and channel flow is compared
本文還對圓管和槽道內的猝發事件進行了分析，得到的圓管和槽道內的猝發周期大致是相同的，但是在猝發的強度上槽道要大於圓管；並且進一步的分析表明猝發強度的差別主要在於徑向速度的差別，這說明壁面橫向曲率對于徑向的流動影響較大，而對流向流動幾乎沒有影響。 -
Under dynamic loading, buried pipe would first damaged in compressive region of bilateral fault, so special treatment should be done to pipe in bilateral fault region. buried pipeline ’ s damage under fluid - structure interaction is analyzed through adina - fsi with conveying medium and velocity in consideration
在考慮管內介質及流速的情況下，應用adina中流體-結構耦合分析求解器adina - fsi分析了固液耦合作用下地下管道的破壞情況。 -
The conveying medium in pipe has great effect on buried pipeline ’ s damage, its flow pattern, temperature, pressure change, velocity, all of these can influence the shell of pipe and its stress distribution. so it is very important to analyze the fluid - pipe coupling
管道內部的輸送介質對管道破壞影響也很大，管內介質的流態、溫度、壓力變化、流速等對管壁變形和應力分佈都有影響，故管道內流體和管道間的耦合分析對地下管道破壞分析很重要。 -
The bigger the density and velocity of the fluid in pipe, the worse the pipeline ’ s damage. so when buried pipe is designed, density and velocity of the fluid in pipe should be generally considered
管道內輸送介質密度和流速越大，管道越易破壞，故在地下管道設計中應充分考慮管內介質的密度與流速。
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