旋渦中心 的英文怎麼說
中文拼音 [xuánguōzhōngxīn]
旋渦中心
英文
center of vortex-
From the numerical modeling results, it can be found that there is a clockwise gyre in the middle part of bohai sea, whether in wintertime or in summertime. in summer, the clockwise gyre corresponding to the high - temperature and low - density center in the middle bohai sea is mainly dominated by the density circulation. and in winter, it is mainly dominated by the wind stress curl
通過數值模擬結果發現，在渤海中部，無論冬季還是夏季，都存在一個順時針的渦旋運動，夏季，對應于渤海中部的高溫低密中心，其流場主體部分呈順時渤海冬夏季環流特徵及變異的初步研究針向旋轉，這主要是密度環流占優的結果，而冬季的順時針向的旋轉，主要是海面風應力旋度影響的結果。Call them twisters or tonadoes, the nature ' s most violent storms with swirling winds that can top 3 hundred miles per hour
旋風或龍卷風是自然界最猛烈的風暴，其渦旋中心風速可超過三百英里每小時。The phenomena of initial disturbance vorticity translating into spiral bands is most evidently for it locating at the periphery of radius of maximum wind ( rmw ), near rmw next and the spiral bands vanish when it is positioned in the inner core region. indicating that the farther the distance from the tc center, the more distinctly the spiral bands and the opposite is true
初始圓形擾動渦度場轉化為螺旋臂渦量帶的現象是初始擾動位於渦旋最大風速半徑（ rmw ）外圍最顯著，其次是rmw附近，當擾動位於渦旋內核區時幾乎沒有螺旋臂結構形態出現，表明，初始擾動離tc中心越遠，其強迫渦旋rossby波形成的螺旋帶結構越明顯，反之越弱。The salinity distribution characteristics are the high - salinity in the bohai bay and the low - salinity in the boahi strait. the density distribution shows that there is a large cyclonic density circulation in bohai sea and it is likely to exist some density current gyre in the middle part of the bohai sea. in winter the saddle - like pattern of the bohai sea temperature and salinity shows that the circulation structure is much complexer than the previous research results
密度分佈表明：夏季渤海灣口已經由以前的低密度中心變為現在的高密度中心，相應的環流結構也必會發生大的變化；夏季渤海中部會存在一個反氣旋式的密度環流，並在局部可能存在多個密度流渦環；冬季渤海「馬鞍狀」溫鹽結構反映其密度環流結構要比以往研究結果復雜得多。Through analysis of potential vorticity in equity - entropy surface field, a relatively high potential vorticity center in cyclone top in low - troposphere have discovered, and make cyclone develop in a more deep cyclone circulation by this ; and an anticyclone circulation zone with more severe low potential vorticity in high - troposphere
通過對等熵面的位渦分析，發現了對流層中低層的位渦場，在氣旋上方有一個相對高位渦中心，由此使得氣旋在一個比較深厚的氣旋性環流中發展；而對流層高層則是一個伴有較強位渦低值的反氣旋環流區。Vortex field - vortex field gives more of a tornado effect, with particles spiralling around the vortex center
漩渦場-漩渦場提供更多的龍卷風效應，粒子螺旋運動在漩渦中心的周圍。A spiral motion of fluid within a limited area, especially a whirling mass of water or air that sucks everything near it toward its center
漩渦在一定地域內液體的螺旋狀運動，尤指把附近各種東西吸向其中心的螺旋水流或空氣In this paper, a bogused vortex with tilted vertical structure is firstly taken into account. check results of experiment b, experiment bt and experiment nb, we find that the simulated tc track, center pressure and pattern of precipitation during landing in experiment b are better than others. so, a bogused vortex with asymmetrical horizontal structure and tilted vertical structure is good for a tc moving in mid - latitude, which may be a new way to initialize this kind of tc in numerical simulation
本文首次採用傾斜垂直結構的人造熱帶氣旋作為初始渦旋，試驗b和試驗bt以及試驗nb的模擬結果對比發現，前者對9806號熱帶氣旋登陸前後的運動路徑、中心氣壓、降水分佈和初始結構的模擬能力優於後兩者，因此，具有傾斜垂直結構的人造熱帶氣旋比正壓結構的人造熱帶氣旋更適合於作為模擬中緯度運動的熱帶氣旋的初始渦旋，從而提出解決該類熱帶氣旋初始化問題的一種新思路。The analysis of dry pv shows that the high pv dominate the area of typhoon, the higher is the center value of pv, the stronger is the typhoon. lt is also shown that the most important reason resulting in rainstorm is the cold air ( high pv ) which spreads to south from the upper troposphere or lower stratosphere and transports into the warm air. the joining situation of upper and lower pv area make vortex develop. pv transpotation reduces static stability, which increases the releasing of instability energy and makes rainstorm amplify
對干位渦的分析表明：臺風或臺風環流區為高值位渦區，臺風越強，位渦中心值越大；對流層上部或平流層下部冷空氣（高位渦）的擴散南下與暖濕氣流的交匯是造成特大暴雨的重要原因，因為上游斜壓性的發展使對流層頂發生折疊，平流層與對流層相互作用增強，上下位渦區相接的形勢使低層渦旋發展，上升運動加強，位渦的下傳有效地降低了靜力穩定度，有利於位勢不穩定能量的釋放，使得暴雨增幅。Numerical simulation by cfd was carried out to understand the hot current behavior in a tunnel with longitudinal ventilation. it becomes clear that fire source modeling is very important because the hot current behavior is strongly affected by the fire source position and is sensitive to methods in the modeling of the fire source. the flame area which has developed from the fire source is an area of chemical reaction caused by combustion. even if grids in the vicinity of the fire source are made fine, it was difficult to simulate the heat generation area with consideration to this chemical reaction through using a method for setting the heat release rate simply on the fire source surface. therefore, we proposed a method adopting the knowledge on flame shape under the longitudinal ventilation and incorporating it into numerical simulation and it showed a good agreement with the experimental results. it was shown through experiments in a tunnel with longitudinal ventilation that the hot current developed toward the tunnel center downwind from the fire source near a wall. the cause was investigated by numerical simulation and it became clear from the results that the spiral air by the fire plume created a vortex in the crevice between the wall and the plume
運用cfd進行數字模擬，以了解縱向通風隧道內熱煙氣流的特性.通過模擬發現對火源進行模擬非常重要，熱煙氣流特性受火源位置的影響很大，並且對火源模擬方法很敏感.火源生成的火焰區是燃燒引起的化學反應區域.即使火源附近的木垛排列完好，也很難在考慮這些化學反應條件下模擬熱生成區域.建議考慮縱向通風隧道內火焰形狀並對它進行數字模擬.模擬結果與試驗結果非常吻合.試驗證明，在縱向通風隧道內，熱煙氣流從靠近墻體火源處順風向隧道中心蔓延.數字模擬結果發現，火災羽流造成的螺旋上升空氣會在墻體和羽流之間形成一個渦流區Abstract : numerical simulation by cfd was carried out to understand the hot current behavior in a tunnel with longitudinal ventilation. it becomes clear that fire source modeling is very important because the hot current behavior is strongly affected by the fire source position and is sensitive to methods in the modeling of the fire source. the flame area which has developed from the fire source is an area of chemical reaction caused by combustion. even if grids in the vicinity of the fire source are made fine, it was difficult to simulate the heat generation area with consideration to this chemical reaction through using a method for setting the heat release rate simply on the fire source surface. therefore, we proposed a method adopting the knowledge on flame shape under the longitudinal ventilation and incorporating it into numerical simulation and it showed a good agreement with the experimental results. it was shown through experiments in a tunnel with longitudinal ventilation that the hot current developed toward the tunnel center downwind from the fire source near a wall. the cause was investigated by numerical simulation and it became clear from the results that the spiral air by the fire plume created a vortex in the crevice between the wall and the plume
文摘:運用cfd進行數字模擬，以了解縱向通風隧道內熱煙氣流的特性.通過模擬發現對火源進行模擬非常重要，熱煙氣流特性受火源位置的影響很大，並且對火源模擬方法很敏感.火源生成的火焰區是燃燒引起的化學反應區域.即使火源附近的木垛排列完好，也很難在考慮這些化學反應條件下模擬熱生成區域.建議考慮縱向通風隧道內火焰形狀並對它進行數字模擬.模擬結果與試驗結果非常吻合.試驗證明，在縱向通風隧道內，熱煙氣流從靠近墻體火源處順風向隧道中心蔓延.數字模擬結果發現，火災羽流造成的螺旋上升空氣會在墻體和羽流之間形成一個渦流區By mesoanalysis of a precipitation that occurred in the middle reaches of the changjiang river, 8th jul. in 2003, the formation and development of the event, its relation with the meso - microscale system are studied, it is emphasized that the low - level jet would cause favorable thermodynamic, moisture and dynamic conditions for the heavy rainfall in the middle reaches of the changjiang river and that the mesoscale vortex formed in the left of the low - level jet would stimulate strong convective clouds and cause the heavy rain
摘要通過對2003年7月8日發生在長江中游的一場大暴雨進行中尺度分析，初步研究了暴雨的形成及發展過程，總結了暴雨的產生與中小尺度系統的關系，著重闡述了低空急流在暴雨形成中的作用，以及在低空急流左側強正渦度中心附近形成中尺度渦旋，激發暴雨雲團等。The mid - eddy centers on 12437 ' e, 37n, and the south eddy centers on 124e, 3530 ' n. the description of the two eddies above is according with the situation of the distribution of temperature and salinity
居中的渦旋中心在124 37 e ， 37 n ，南部的渦旋中心在124 e ， 35 30 n ，上述兩渦旋與以往溫鹽的分佈結果相符。Work is done to find out the relationship between scroll wraps profile and the track of machining tool. a general equation about the relationship is recommended
摘要對渦旋型線加工的刀具中心軌跡程序進行了分析，提出了通用刀具中心軌跡方程並簡單介紹了其應用情況。Generally under 300hpa the subsidence zone of the potential vorticity lies above cyclone at the violent stage of the development of the cyclone, however, the center of cyclone still lies near the potential vorticity of large value above 300hpa
氣旋強烈發展期，一般300hpa以下，位渦的下沉區在氣旋的上空， 300hpa以上氣旋中心仍位於大值位渦後部。It contributes to the development of the cyclone when the center of the potential vorticity is behind the cyclone at initial stages of the development of the cyclone and there is a manifest inverted conical subsidence zone under the 200hpa, which lies in the rear of cyclone
氣旋的發展初期，位渦中心位於氣旋的後部， 200hpa以下有明顯的倒圓錐形下沉區，該下沉區位於氣旋的後部。這種形勢有利於氣旋上空的位渦增長。This paper discuss the effect of roughness coefficient on the tropical cyclone landfalling process using a idealized tc model developed from psu / ncar mm5 in the condition of quiescence and f - plane atmosphere. in order to understand the different influences of land and sea surfaces in the tc landfalling process, two kind of experiments had been designed : one for settled tc, the other for movable tc, and each kind consists four tests. the result indicates that the distribution of wind, precipitation, warm core and intensity of tropical cyclone has been changed obviously due to the effect of difference between the land and sea
本文利用bogus技術在psu / ncarmm5中加入了理想熱帶氣旋初始渦旋，在f -平面和無環境流場的理想情況下，設計了兩組靜態和動態試驗，通過控制試驗和不同粗糙度的登陸試驗，分別從空間和時間上探討了理想熱帶氣旋的登陸規律和分佈特徵，特別研究了邊界層中熱帶氣旋中心區域風場的垂直細致結構，並初步分析了其物理機制。The attacking midfielder was at the centre of a transfer battle between the two clubs in the summer, but the spanish giants have never given up on the idea of seeing the brazilian at the santiago bernabeu
在夏季的時候，這位前腰就被捲入了這筆轉會旋渦的中心，即使夏季受挫了，但是西班牙球隊從來沒有停止過爭取把他帶到柏納烏的努力。A transverse secondary circulation is produced by the coupling of high and low jets, while the sinking branch of the secondary circulation providing the dynamic conditions for the dry intrusion air. during the period of the heavy rain process, dry intrusion descends southward along the intense constant potential temperature lines, which promotes the lower cyclone. in addition, the pouring of upper - level dry air not only decreases ground temperature behind the front but also increases surface pressure and velocity
由於高、低空急流耦合，在高空急流中心左側產生的下沉運動和高空急流中心右側、低空急流左側產生的上升運動在鋒面上形成一次級環流，次級環流的下沉支運動為對流層高層干空氣和高位渦的下傳提供了動力條件；進一步研究發現，干侵入沿相當位溫密集帶向南向下伸展，引起對流層低層氣旋性渦度的發展；此外，高層乾冷空氣向下注入，導致地面溫度降低、氣壓升高、風速加大、低層輻合增強、上升速度加大，從而促進了新的對流運動，引起降水增強。Abstract : in order to improve the performance of a vortex classifier, a certain type of narrow plates are fitted in the passages between the blades in the rotor cage. this measure results in reduction in the cut size and increase in classifying precision. more significant effect is observed in the case of the rotor cage with fewer blades originally fitted. it is pointed out that the reason is due to the decrease in inertia counter vorticity
文摘:在渦流分級機轉籠通道中心加裝窄葉片使產品分割粒徑減小，分級精度提高.轉籠徑向葉數較少時加裝效果明顯，徑向葉片數多時效果不明顯.分析指出，這是減小了轉籠徑向葉片間慣性反旋渦強度的緣故分享友人