渦流理論 的英文怎麼說
中文拼音 [guōliúlǐlún]
渦流理論
英文
vortex conception-
The noise of the fan is mainly consist of circumrotatory noise and backset noise based on the theoretical analysis
首先基於風機噪聲理論的分析確定了影響風機噪聲源的主要因素是旋轉噪聲和渦流噪聲。In the first part, the steady nonlinear vortex lattice method is adopted to calculate the hydrodynamic characteristics of open water ichthyoid rudder, and the induced velocity of ichthyoid rudder is calculated using panel method
本文理論計算部分，採用定常非線性渦格法計算魚形舵的水動力性能，用面元方法計算舵流場的誘導速度。The probe ' s linearity, temperature and dynamic characteristics are analyzed base on principal theory of eddy - current displacement sensor, such as the influence of the coil q value to the linearity characteristic, influence of the diameter of coil to the linearity characteristic, influence of coil resistance to the temperature characteristic, influence of the measuring coil to the syntony loop
在介紹渦流位移傳感器的基本理論的基礎上，分析了傳感器探頭線性特性、溫度特性、動態特性的影響因素。從探頭線圈q值對線性特性的影響；探頭直徑對線性的影響；探頭線圈電阻對溫度特性的影響；激勵信號溫度特性的影響：檢測線圈?振迴路動態響應特性等方面分析並提出製作高質量傳感器探頭的改進措施。On the basis of axial vortex theory, the aerodynamic performance of tilt - rotor model has been built, and using it to analyze the aerodynamic performance of xv - 15, comparing to the actual data to prove the model ’ s validity, finally studied the variety of aerodynamic performance relative to the variable rotor diameter
以軸向渦流理論為基礎，建立了適合於傾轉旋翼機氣動分析模型，以xv - 15傾轉旋翼機作為算例，通過結果的對比，表明本文的氣動模型能較好的分析傾轉旋翼機的氣動性能，並在氣動性能的基礎上分析了直徑變化對傾轉旋翼機氣動性能的影響。The paper analyzes the characteristic of aerodynamics with structure of helicopter propeller blade, dissertrates vortex theory and the theory about gliding air field which produce the power of helicopter propeller blade. at the same time it also deduce the method of computing the induced velocity produced by helicopter propeller blade with vortex theory. at last, an influcence to the spreading of sound is discussed
並且將兩種定位演算法進行了比較，說明了優劣；結合直升機的結構分析了旋翼的空氣動力特性，論述了直升機旋翼產生拉力的滑流理論和渦流理論，結合渦流理論論述了直升機旋翼流場誘導速度的計算方法，在此基礎上分析了直升機旋翼流場對聲音傳播的影響。The regularities distribution of the electromagnetic field and vortex density had been simulated by the software matlab, the results of simulation not only proved the existence skin effect but also provided theory evidence for designing and researching of the shaft bearing replacer
通過matlab軟體對被加熱工件進行了電磁場和渦流分佈的計算機模擬，形象描述了工件內電磁場的分佈規律，證明了集膚效應的存在，為軸承感應拆卸裝置的設計研究提供了理論依據。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。In this paper, some characteristics of flow movement and sediment transport are analyzed by using the flume experiment data. the cross section of compound channel can be divided into four regions : the undisturbed region in main channel, the interactive region between channel and plain, the undisturbed region in flood plain and the boundary region. in the undisturbed regions, the distribution of longitudinal velocity along the depth has the feature of lograithmic. whereas, in the interactive region, the longitudinal velocity does not obey the logarithmic distribution law, but it can expressed as a revised logarithmic function by using a wake function. on the basis of the kinematic equation the velocity distribution of transverse velocity is obtained. in the boundary region, the longitudinal velocity obeys the law of parabolic distribution. furthermore, according to the simplified diffusion equation, the transverse distribution of sediment concentration in the interactive region is deduced. the analysis is in good agreement with the measured data
本文根據漫灘水流的運動特點，將漫灘水流的復式斷面分為主槽平衡區、灘槽交互區、灘地平衡區及邊壁區等4個區，並給出了各區寬度的經驗公式.根據灘槽交互區垂線流速分佈的變化特點，提出了附加尾流函數的對數流速分佈公式.在簡化水流運動方程和泥沙擴散方程的基礎上，對灘槽交互區內垂線平均流速及含沙量沿橫向分佈進行了理論分析，提出了反映灘槽水流動量交換強度的橫向渦量粘性系數及橫向擴散系數的表達式，得到了漫灘水流垂線平均流速及含沙量沿橫向分佈的解析解，並與實測資料吻合較好In the second chapter, the fluid mechanics principle of vortex flowmeter at first was introduced. the classical theory about vortex flowmeter and the method of computational fluid dynamics about flow around body were expanded on, and the model of the single bluff body and the dual bluff body vortex flowmeter were constructed. and then, fvm - finite volume method - analysis software fluent was applied to analyze the flow phenomenon of flow over single bluff body or dual bluff body
然後通過大量實驗和理論分析給出雙鈍體渦街流量計的設計準則：當管徑為d ，鈍體形狀為三角形，則鈍體設計參數為：銳邊寬度= 0 . 26d ，高度= 0 . 34d ，鈍體之間的距離= 1 . 2d （即當兩鈍體寬度相等且鈍體距離等於單鈍體兩列旋渦之間的距離） 。In the second part, firstly, the mathematical model for predicting hydrodynamic characteristics of varivec propeller under steady or unsteady condition are present, based on the general propeller lifting - surface theory, potential flow theory and green theorem. then, theoretical calculation methods for predicting hydrodynamic characteristics of varivec propeller designed above paragraphs are present, based on the finite basic solution method, the unsteady vortex lattice method and hess - smith method
在理論計算部分，本文首先基於常規螺旋槳升力面理論、勢流理論和格林定理建立了定常和非定常狀態下全方向推進器水動力性能計算的數學模型，然後利用有限基本解法、非定常渦格法和赫斯?史密斯方法對全方向推進器定常和非定常狀態下的數學模型進行了數值離散，接下來針對前面所設計的全方位推進器進行了數值預報。Based on the green ' s formula and the assumption of the propeller blade ' s thin sections, a lifting - surface method of propellers with the vortex lattice and equal source panel distributions on the mean camber surface has been introduced for the prediction of steady propeller ' s hydrodynamics in this paper. an approximate kurta condition was applied
基於creen公式和薄翼理論假設導出的升力面方法，採用在螺旋槳拱弧面上分佈離散渦、源布置方法預報均勻流場中的螺旋槳的定常性能，螺旋槳尾渦面上壓力連續性條件採用近似的kutta條件處理。In the second part of the paper, with employing the game reanalysis data and on the basis of the theories of the baroclinic vorticity development, this paper inferred from the dynamic analysis that the horizontal vorticity can represent the baroclinic intensity of the large - scale atmosphere, and the conversion of the horizontal vorticity converting into the vertical vorticity is actually the phenomenon that the horizontal vorticity flux of the summer monsoon owning the striking longitudinal - direction vertical structure and the strong baroclinicity, influence on the horizontal movement of the atmosphere
在第二部分，基於第一部分的結果，本文在斜壓渦度發展理論的基礎上，用在我國季風區具有更高準確性的game再分析資料，討論分析了能代表大尺度大氣斜壓性強度的水平渦度在向垂直渦度轉化的情況，說明了此轉化就是具有明顯經向垂直結構特徵和強斜壓性的夏季風環流圈將其經向垂直剖面上的渦旋通量強迫於水平運動的現象。The paper synoptically and comprehensively introduces eddy current theory, equivalent circuit, excitation coils, test circuit and application of the eddy - current sensors. a feasible solution of motor core height control based on silicon steel sheet thickness measuring with double eddy - current sensors is presented
論文在系統全面的分析了電渦流傳感器的基本原理、等效電路、激勵線圈、測量電路及應用后，提出將雙探頭測厚系統應用於電機鐵芯疊控制。This paper, firstly, introduces some basic nondestructive tests, shows the background of the subject about the test for the defect of sucker rod, by comparing with the other nondestructive tests, proves the advantage of eddy - current test, then beginning with maxwell equation in electromagnetic field theory and combining with the idea model of defect, this paper proves that the feasibility of eddy - current test technology in multi - parameter and multi - frequency which applied in the test for for the defect of sucker rod
本文首先介紹了無損檢測技術的幾種典型方法，並給出了抽油桿裂紋檢測這個課題的背景，通過同其它幾種無損檢測技術的比較，給出了電渦流技術的優越性。然後從電磁場理論中的麥克斯韋方程出發，結合裂紋的理想模型，從理論上證明了電渦流多頻率多參數檢測技術在抽油桿裂紋檢測中的可行性。Aimed to realize the problem of quenched rail qualification forcast through quantitative analysis of quenched rail surface hardness by eddy current, and combined the eddy current theory with the computer image processing and signal analysis, the hardness testing model is established in this paper
針對渦流無損檢測淬火鋼軌踏面硬度的定量分析來實現淬火鋼軌質量保證預報問題，將電渦流理論與現代計算機圖象處理和信號分析相結合，完成硬度測試模型建立。Abstract : aimed to realize the problem of quenched rail qualification forcast through quantitative analysis of quenched rail surface hardness by eddy current, and combined the eddy current theory with the computer image processing and signal analysis, the hardness testing model is established in this paper
文摘:針對渦流無損檢測淬火鋼軌踏面硬度的定量分析來實現淬火鋼軌質量保證預報問題，將電渦流理論與現代計算機圖象處理和信號分析相結合，完成硬度測試模型建立。The eddy current ring of pressure pipeline that is detected by spot probe is studied firstly in theory
摘要首先從理論上分析了放置式探頭探測壓力管道時的渦流環模型，然後應用此模型推導出了檢測時的特徵頻率計算公式。In the 1960 ' s, the circumfluence theory has been used to design the shroud - propeller, and it can be divided to two methods, one is that the profile of die shroud is provided, the other is that the pressure distribution of the shroud is provided.
到六十年代，函道螺旋槳的環流理論就可用來計算這種推進器的設計問題。本文中使用的方法是：函道用圓環渦系和圓環源、匯系模擬，用線性理論計算；螺旋槳用一個變負載的鼓動盤模擬。Under some conditions, vortices are alternately shed from each side of the cylinder, which induces the fluctuating forces acting on the cylinder. it decreases the operating time of the equipment. for the purpose of the long - term reliability and the safety designing of the industrial component and the theory of gas - liquid two - phase vortex street, gas - liquid two - phase vortex street is simulated by commercial software phoenics for the first
工業領域內存在著大量的氣液兩相繞流柱體的現象，一定工況下形成交替脫落的旋渦，誘發柱體受到脈動升力的作用，由此產生的疲勞損傷大大縮短了工業設備的使用壽命，為了促進氣液兩相渦街理論的發展和給工業設備的設計和安全運行提供充分的科學依據。The principal contributions of this dissertation are : 1. a high fidelity and real - time rotor wake inflow model was built up. based on peters - he finite states wake theory, a new influence coefficient matrix for high speed flight was derived, the modified wake model is better suitable for the flight state with a large wake skew angle
本模型以peters - he有限狀態尾跡理論為基礎，修正了大尾跡傾斜角時的誘導速度影響系數矩陣，並結合了王氏渦流理論，導出了旋翼誘導速度垂向分量和旋轉分量的表達式，可計算平尾、尾槳和垂尾氣動中心處誘導速度各分量。分享友人