vortex velocity 中文意思是什麼
vortex velocity
解釋
渦旋速度-
In the boundary, velocity and reynolds stress was distorted greatly by the vortex that leaded to an upwash domain and a downwash domain
射流傾斜角度和速度的變化將引起渦旋對邊界層影響范圍的變化。 -
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。 -
Its peculiarity is that the vortex pair formed on the ejection stroke can ? move far enough under the self - induced velocity, so the vortex pair is sucked into the cavity of the actuator during the suction stroke
這種流動的特點是：在作動器的「吐出」行程，其出口產生的旋渦對還來不及向下游遷移便進入了作動器的「吸入」行程，重新進入作動器腔體。 -
Because of its special structure, the high velocity flow under the shield, big vortex and upcast flow behind the shield will affect the spray drift. if these situations could be changed, the drift can be reduced further
但由於該罩蓋的結構特點，其下方產生較大速度的運動氣流和罩蓋後部產生的渦流以及上旋氣流，將直接影響霧滴的飄失。 -
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。 -
In this thesis hydraulic experimental studies and theoretical analyses on the vortex - flow drop shaft were conduced and the following results were accomplished : ( 1 ) in the model test some hydraulic characteristics including the shape of air core in the center of the drop shaft, the radial distribution of water flow velocity and the distribution of pressure on the wall of the drop shaft were measured under the condition of high water head above 250m and large discharge above 1400m3 / s. ( 2 ) a kind of computational method for the spiral water flow in the air core region of drop shaft was discussed and applied and the results agree the experimental data well. ( 3 ) the total ratio of energy dissipation in the drop shaft can reach 90 % and the energy dissipation in every region was discussed quantitatively
本文通過試驗研究與理論分析對旋流式豎井泄洪洞應用於高水頭、大泄流量情況時存在的一些水力學問題進行了研究和探討，取得以下主要成果：一、結合小灣工程導流洞改建，對高水頭（ 252m ） 、大泄流量（ 1400m ~ 3 s ）條件下旋流式豎井中的水流運動特徵進行了比較全面的測量，包括空腔形態、徑向流速分佈及井壁壓強等；二、提出了豎井空腔段螺旋水流水力計算方法，其計算結果與實測值吻合良好；三、利用試驗與計算結果，對旋流式豎井的消能機理進行了探討，對豎井各部分的消能能力有了總體認識；四、對豎井下部消力井的合理井深進行了優化試驗研究，發現消力井合理深度為0 . 9d左右；五、通過試驗研究，歸納出豎井水流總摻氣量估算方法，為導流洞排氣方案的設計提供了參考依據；六、在高水頭、大流量條件下，豎井空腔段下部流速很高，盡管水流螺旋運動引起的離心力可以確保井壁壓強保持正壓，但空化數依然較低，因此豎井的空化空蝕始終是工程界關注的重大問題。 -
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。 -
The vortex - vibration was measured when the towed velocity, dip angle between the circular cylider and flow velocity, and diameter were varied
對不同拖曳速度、拖纜傾角，即拖纜與來流速度之間的夾角和不同直徑的拖纜渦激振動進行了測量分析。 -
At large attack angle the frequency of the vortex has n ' t a apparent zone of " lock - in ". the fluid - induced vibration at large attack angle belongs to the stable dynamic response problems. but a sudden skip of amplitude will occur at large inlet velocity
在大攻角下分離渦脫落的頻率沒有一個明顯的頻率鎖定區域，流體振動屬于穩定的動力響應問題，但在大來流速度下會出現振幅突跳的現象。 -
Firstly, the airfoil ' s classic flutter ( at small attack angle ), stall flutter ( near the static stall angle ) and response ( at large attack angle ) are analyzed. it is found from the numerical results that " lock - in " will occur at certain freestream velocity range near the static stall angle, where the frequency of the vortex will be equal to the natural frequency and the flutter has the characteristic of self - induced oscillation. when the attack angle is far from the static stall angle, the vortex will have its own frequency, which differs from the natural frequency, and the flutter has the characteristic of forced oscillation
首先研究了二維翼型的古典顫振（小攻角） 、失速顫振（失速攻角）和動力響應問題（大攻角） ，得到以下結論：在靜態失速攻角附近的一定來流速度范圍內，分離渦會發生頻率鎖定現象，分離流的頻率與固有頻率趨于相同，這時的振動呈現自激振動的特點；遠離失速攻角時分離流頻率則擺脫固有頻率的影響，此時的振動具有強迫振動的特點。 -
At first an analysis of the basic principles of the vertical - axis variable - pitch turbine is given including two methods to calculate the induced velocity. one is the three different streamtube - methods which are single - disk single - streamtube ( sdst ), double - disk single - streamtube ( ddst ) and multi - streamtube ( mtt ) method based on the momentum theory, the other is the vortex method ( vtth ) based on the potential eddy theory
一是根據動量定理的流管模型得到的求解誘導速度的單盤面?單流管方法（ sdst ） 、雙盤面?單流管（ ddst ）方法、多流管（ mtt ）方法；二是根據勢渦理論得到的求解誘導速度的的渦方法（ vtth ） 。 -
A novel strip - coil - baffle structure used to enhance heat transfer and support the tube bundle for a tube - shell heat exchanger is proposed. the new structure can sleeve the tubes in bundle alternatively to create a vortex flow in a heat exchanger. the numerical simulation on the flow and heat transfer characteristics for this new structure heat exchanger is conducted. the computational domain consists of two strip - coil sleeved tubes and two bare tubes oppositely placed at each corner of a square. the velocity and temperature fields in such strip - coil - baffled channel are simulated using fluent software. the effects of the strip - coil - baffles on heat transfer enhancement and flow resistance in relation to the reynolds number are analyzed. the results show that this new structure bundle can enhance the heat transfer coefficient up to a range of 40 ? to 55 ? in comparison with a bare tube bundle ; meanwhile, higher flow resistance is also accompanied. it is believe that the strip - coil - baffled heat exchanger should have promising applications in many industry fields
介紹了一種用於強化管殼式換熱器殼側傳熱和支撐管束的螺旋折流片新型結構，該結構是對換熱器管子相間地套上螺旋折流片以產生旋渦流動.研究模型是在正方形布置的4個管子中的2個對角管子套上螺旋折流片后形成的通道，利用fluent軟體對該上述四管通道模型的流場和溫度分佈情況進行了數值模擬;分析了四管通道模型中螺旋折流片對強化傳熱和流動阻力隨雷諾數的變化關系的影響.算例結果顯示該新型結構可比相同尺寸的光管通道中的情形傳熱系數提高約40 ? 55 ? ，同時也將伴隨較高的流動阻力.可以相信螺旋折流片式換熱器將會在許多工業領域有良好的應用前景 -
Abstract : a novel strip - coil - baffle structure used to enhance heat transfer and support the tube bundle for a tube - shell heat exchanger is proposed. the new structure can sleeve the tubes in bundle alternatively to create a vortex flow in a heat exchanger. the numerical simulation on the flow and heat transfer characteristics for this new structure heat exchanger is conducted. the computational domain consists of two strip - coil sleeved tubes and two bare tubes oppositely placed at each corner of a square. the velocity and temperature fields in such strip - coil - baffled channel are simulated using fluent software. the effects of the strip - coil - baffles on heat transfer enhancement and flow resistance in relation to the reynolds number are analyzed. the results show that this new structure bundle can enhance the heat transfer coefficient up to a range of 40 ? to 55 ? in comparison with a bare tube bundle ; meanwhile, higher flow resistance is also accompanied. it is believe that the strip - coil - baffled heat exchanger should have promising applications in many industry fields
文摘:介紹了一種用於強化管殼式換熱器殼側傳熱和支撐管束的螺旋折流片新型結構，該結構是對換熱器管子相間地套上螺旋折流片以產生旋渦流動.研究模型是在正方形布置的4個管子中的2個對角管子套上螺旋折流片后形成的通道，利用fluent軟體對該上述四管通道模型的流場和溫度分佈情況進行了數值模擬;分析了四管通道模型中螺旋折流片對強化傳熱和流動阻力隨雷諾數的變化關系的影響.算例結果顯示該新型結構可比相同尺寸的光管通道中的情形傳熱系數提高約40 ? 55 ? ，同時也將伴隨較高的流動阻力.可以相信螺旋折流片式換熱器將會在許多工業領域有良好的應用前景 -
Relativel ~ ~ matlab language is more powerful than oilier computing language, especially in computation fluid mechanics, it helps to simply draw charts of vortex, stream function, velocity, pressure, and the amount of work can be extremely reduced, and the program coniplving can also be controlled easily
得到空化數的分佈以後，進而分析流場內空泡的運動軌跡，最後得到空泡半徑在流場內隨壓力的變化關系曲線，以及在流場內空泡半徑沿壓力最小點的分佈規律。 -
A mathematical model of flows in the substrate was established using the equivalent continuum approach, and multi - dimensional numerical simulation of the steady flows in the catalytic converters was performed. simulation results show that the separation and vortex, which cause the pressure loss and the velocity non - uniformity at the front of the first substrate, are generated near the wall of the conical pipe. in addition, the larger the inlet cones angle the more the pressure loss and maldistribution in converters, however, when the angle enlarges enough the pressure loss would be decrease
結果顯示氣流在擴張圓錐管壁附近出現分離產生較強的擾動，造成局部流動損失和載體前氣流速度沿徑向分佈不均勻；入口擴張管結構對催化器的流動特性有很大影響，但並非擴張角越大，催化器流速武漢理工大學碩士學位論文分佈的不均勻性和壓力損失也增大，而是存在著一個最佳角度，但當擴張角增大到一定程度以後，擴張角對流速分佈和壓力損失的影響變小。 -
In the near field, the vortex pairs are gradually and periodically formed, and at the same time they migrate down stream under the self - induced velocity
在作動器出口附近，旋渦對逐漸捲起並向下游推進，而且旋渦對是不連續的。 -
The effects of jet velocity ratio and skew angle were addressed. several co - rotating minute vortexes on the turbulence boundary layer would coalesce together that leaded to a big vortex. the effect of the big vortex was greater than a single minute one
單排多個同向射流與主流作用所產生的獨立小渦旋將在流向下游發生合併，形成大渦旋，大渦旋對邊界層的作用效果要強于單個獨立小渦旋。 -
Result shows that the dip angle, the towed velocity and reduced velocity are main influence factors to the vortex - induced vibration of a circular cylinder
結果表明，約化速度、拖纜傾角、拖曳速度等是影響渦激振動的主要因素。 -
I setted up the physical modele and calculation - domain for the conviction heat transfer enchancement by the longitudinal vortex, and did the numerical value simulation for the chang of the velocity filed and temperature filed which influnced by lvg. at the same time, i studied the generation develepment of the longitudinal and its mechanism for the heat transfer enchancement. by the analycise of the result, i got the pricipium rule of how the size, ratio corner and distence of the lvg have influence on the generation and develepment of longitudinal vortex, and gave out the relative construct parameter scope
通過對phoenics軟體進行應用開發，本文建立了渦旋強化換熱的物理模型和計算域，對擾流元作用下的流動速度場和溫度場的變化進行了數值模擬，研究了縱向渦旋發生發展及其強化對流換熱的機理。初步得出了擾流元的有關結構參數如總體尺寸、寬高比、攻角、間距等因素對渦流發生發展的影響規律，並給出了有關結構參數的取值范圍。 -
A " saddle " shape appears in the curve of relationship between smd ( sauter mean diameter ) and charging voltage, the droplets " size distribution fluctuates with the change of charging voltage. the influence of electric field on flow field is apparent. the distribution of velocity and turbulent energy, structure and size of vortex appear different changes with the increase of voltage of charging
索太爾粒徑隨電壓的變化曲線中出現「馬鞍」現象，粒徑的分佈情況隨電壓的升高出現波動性變化；電場對流場的作用明顯，速度與湍能的分佈及渦的結構等流場特性隨電場的改變均有不同規律的變化。
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