脈動渦流 的英文怎麼說

中文拼音 [màidòngguōliú]
脈動渦流 英文
pulsed eddy
  • 脈 : 脈名詞1. （動脈和靜脈的統稱） arteries and veins2. （脈搏的簡稱） pulse 3. （像血管的組織; 連貫成系統的東西） vein
  • 渦 : 渦名詞1. （漩渦） eddy; whirlpool; vortex 2. （酒窩） dimple
  • 流 : Ⅰ動1 （液體移動; 流動） flow 2 （移動不定） drift; move; wander 3 （流傳; 傳播） spread 4 （向壞...
  • 脈動 : [物理學] [天文學] pulsation; pulsing; pulse; ripple; impulsive motion; pulsating; panting; loping...
  1. 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。
  2. In this work, a new dual triangulate bluff body vortex flowmeter was developed, the flux lower limit value of which lower by 50 % that of the old single bluff body vortex flowmeter. the linear correlation of the correlation between the velocity pressures of fluid disturbs wave and that of vortex precession in vortex precession flowmeter was brought to light, and a spectrum phase discrimination method based on fft to remove the effect of fluid pulsating interference on vortex precession flowmeter was advanced

    研製出比傳統單鈍體渦街流量計流量下限降低約50的新型雙鈍體渦街流量計；揭示出脈動流中旋進旋渦流量計流體振動特性，並在此基礎上提出基於fft相位判別的數字信號處理方法來消除流場脈動對旋進旋渦流量計的干擾的方法。
  3. The elementary flow structure is a mixed structure of the main jet section and the swirl software. the boundary section is a strong turbulent cut section. the main jet mainly dissipates the energy in this section

    主射流機誡能的傳遞、再分配和消散過程中，紊流脈動所提取的能量最多，其次h漩渦所吸收的能量。
  4. In chapter 3, the subgrid eddy - viscosity model for large eddy simulation is applied to calculate the three dimensions unsteady periodic turbulent flow in yantan francis turbine. the pulsating characteristics of some main physical parameters in flow field are found. the calculated axial water thrust of hydraulic turbine agrees with the model - test value

    第三章採用大渦模擬亞格子渦粘模型，對巖灘混流式水輪機的流場進行三維非定常湍流分析，得到了流場中各物理量的脈動特性，計算出ms的軸向水推力與模型試驗值大小相當；同時論證了對于下機架承重的混流式水輪發電機組可採用其推力軸承負荷作為水電站廠房振動的最大垂直激振荷載。
  5. In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source

    摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。
  6. The secondary air duct of boilers is a group of large diameter short ducts in parallel connection, having inlet air flow condition with inner positioned resistant pieces

    摘要鍋爐二次風道為有內置阻力件的一組並聯大口徑短通道，其阻力系數嚴重偏小而且風門渦流強烈，從而造成二次風強烈脈動。
  7. The research result demonstrates that along with the increment of reynolds number, the root mean square value of outer fluctuating magnitude of the external diameter in fall frequency band increases, the root mean square value of fluctuating magnitude of the external diameter in high frequency band decreses, demonstrating that the fluctuation of flexible pipe wall changes fluctuation don field of original rigid pipe, large - size eddy motion increases and small - size eddy motion decreases, this reduces energy loss and increases friction reduction effectiveness

    研究結果表明：隨著雷諾數的增加，全頻帶的外徑脈動的均方根值加大，但高頻帶外徑脈動的均方根值減小，說明柔性管管壁脈動確實改變了原剛性管的脈動流場，大尺度渦的運動加劇，低尺度渦運動減弱，從而使得能量損失減少，減阻效果增大。
  8. The shearing layer is carried by the jet and the eddy is formed because of the instability and selective amplification of shearing layer which will propagate to the downstream. as the eddy impacts the impinging wall, a wave of pressure disturbance with certain frequency is induced. this wave then propagates to the upstream with high speed, and results in the overlap and amplification of the waves when the frequencies of them are close with each other

    當前噴嘴流束中的不穩定擾動波在穿過腔內的剪切層時，剪切層對其有選擇放大作用，形成渦環結構，剪切流動中渦環與碰撞壁撞擊，在碰撞區域產生壓力擾動波並向上游反射，在上游剪切層分離處誘發新的擾動的產生，當新擾動與原擾動匹配時，射流上游就被不斷地受到周期性激勵，腔內就產生流體自激振蕩並在後噴嘴出口形成脈沖射流。
  9. For the present two les models, adopting the subgrid eddy viscosity concept and introducing the transport equation of turbulence energy k, the subgrid scale turbulence is parameterized by the turbulence energy k and the length scale of turbulence / ( k - 1 model ). in addition, vegetation is considered as an internal source of resistant force and turbulence energy

    在應用大渦模擬方法求解數值計算模型控制方程時，亞網格雷諾應力項沿用了亞網格渦粘性系數思路，引入亞網格紊流脈動動能k的輸運方程，建立了關于亞網格紊流脈動動能k和紊流特徵長度l的k - l模型求解。
  10. And then simulations of gas - particle two phase plane wake and gas - particle two phase plane jet were carried out by using this model. after numerical simulations of the two flow fields were finished, series of analytical work was done. first, the distribution of time - averaged velocity, turbulence intensity was analyzed, and some of the simulation results were compared with those of the experiments ; the coherent structure of vortices in the near wall region of the plane wake flow were studied by describing the evolution of the eddy structures, including the forming, developing and shedding from the wall of the vortices in the near wall region ; the coherent structure of vortices in the whole field was also studied, such as the forming, developing, moving, pairing and merging of the eddies etc.

    在對上述兩種流動形態的二維大渦模擬研究中，首先全面地分析了氣相時均流場的速度、湍流強度的分佈規律以及氣相速度的脈動規律等並就部分數值模擬結果與實驗結果進行了對比研究；分析了平面尾跡流場中近壁處旋渦擬序結構，全面和逼真地反映了近壁處旋渦的生成、發展和脫落的規律；描述分析了平面尾跡流和平面射流的全場流動旋渦擬序結構，從整個流場的角度反映旋渦的生成、發展、運動以及旋渦之間相互配對、合併的作用規律等。
  11. 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。
  12. When the pulsating jet was introduced in the heat exchanger, pulsating flow leads to the formation of an amount of vortices near the tube wall. the boundary layer was destroyed and the mixing of liquid was improved, so heat transfer enhancement was achieved

    將自激振蕩脈沖射流引入換熱器后，流體的脈動導致了壁面處旋渦的大量生成，增加了流體的摻混，實現強化換熱的目的。
  13. An experimental study of the dynamic characteristics of swirlmeter in oscillatory flow

    脈動流場中旋進旋渦流量計流體振動特性的實驗研究
  14. The low - level jet stream has three vibration processes, which corresponded to the three lows " beginning and developing

    低空急流有三次脈動過程，與三個低渦的產生和發展對應。
  15. The main contents and conclusions are as follows : 1. the dynamic pressure on the original riverbed and the scour hole are measured. the results show that the characteristics of dynamic pressure in the scour hole are the same as that on the original riverbed

    表明在基巖沖刷過程中以及沖坑穩定后，射流沖擊區的脈動壓強與沖坑形成前一樣，都是以低頻大振幅為主，說明在沖刷坑形成后，射流沖擊區水流與無沖坑時一樣，都是大尺度渦不斷破碎和小尺度渦不斷生成的過程。
  16. 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。
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