比水頭 的英文怎麼說

中文拼音 [bǐshuǐtóu]
比水頭 英文
specific head
  • 比 : Ⅰ動詞1 （比較; 較量高下、 長短、距離、好壞等） compare; compete; contrast; match; emulate 2 （比...
  • 水 : 名詞1 （由兩個氫原子和一個氧原子結合而成的液體） water 2 （河流） river 3 （指江、河、湖、海、洋...
  • 水頭 : waterhead; head; flood peak水頭落差 head fall; 水頭坡降 water table gradient
  1. Because of the technical complexity of the turbine for the three gorges project and on the basis of several important technical problems which have been defined in the international bidding documents for 14 generating units in the left bank power station, the owner of the project has decided another some important technical problems based on appraisal and comparison in the bid appraisal stage after the bidding documents are analyzed and the tender documents are cleared by the tenderers

    由於三峽工程水輪機技術上的復雜性和挑戰性，在左岸電站14臺機組國際招標文件已明確了若干重大技術問題的基礎上，在機組議評標階段，對招標文件進行分析和投標商對投標文件進行澄清說明后，經評議比選，業主又決策了幾個重大技術問題，主要有：水輪機設計水頭的確定，負傾角葉片水輪機的應用，兩套水力設計，舍棄初期轉輪，蝸殼進行水壓試驗等。
  2. Finite volume method is appilied in numerical modeling of the flow in no - pressure tunnel of high water reservoir in this paper. i select standard k - turbulence modeling that put forward by launder and spalding in 1972 by weighted poly - turbulence modeling. the difficulty is that there is free surface in flow, but free surface problem ' s calculating region is indefinitely

    本文利用有限體積法對高水頭下水庫無壓泄水洞水流進行了紊流數值模擬，根據多種紊流模型的優缺點進行比較，選擇了launder和spalding於1972年提出的標準的k ?紊流模型。
  3. 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。
  4. The roto - jet pump is a new kind of very low specific speed pump which is developed in recent years. it is always used in carbin black, food production, chemical industry and deep well mining system to supply the steady outflow with low flux and high pressure

    旋轉噴射泵是近些年才發展起來的一種極低比轉數泵，主要用在碳黑、食品、化工以及深井采礦系統中用以提供小流量高水頭的穩定出流。
  5. This paper analyses the stress and deformation of the two lining structure types of the surge shaft surrounded with crush rock under the action of high water pressure by using fem, compares the two lining types ' s merits and demerits in stress, deformation, fracture state, the combining bearing of surrounding rock and lining structure, the safety and economics

    本文針對圍巖條件比較破碎，裂隙發育的調壓井洞室結構，就兩種襯砌結構型式分別進行了高水頭作用下的有限元數值模擬，從調壓井襯砌結構選型角度分析對比了兩種襯砌結構型式在圍巖及襯砌結構應力與變形、襯砌結構鋼筋混凝土開裂、圍巖與襯砌結構聯合承載、結構安全儲備、經濟等方面的優劣。
  6. For the low water head water control project at a branching channel, its flood discharge capacity is related not only with the total discharge width but also with the discharge width ratio of the two branches

    摘要位於分汊河段的低水頭樞紐，其泄洪能力不僅與樞紐的總泄流寬度有關，而且與兩汊泄流寬度之比有關。
  7. This paper elaborates the parameters selection of the 700mw turbine for laxiwa power station located upstream yellow river, which is coming into construction soon. through statistical calculation of specific speed for turbines with large capacity, high operating head in domestic and oversea power station, utilizing turbine homologous theory. adopting regression statistic calculation method, it has got specific speed statistic equation., the demonstration of primary parameters selection, and the primary target parameters suitable for laxiwa power station

    本文針對黃河上游即將開工建設的拉西瓦水電站700mw水輪機的參數選擇進行了研究，通過對國內外的大容量、高水頭水輪機的比轉速統計計算，利用水輪機的相似理論，採用回歸統計計算方法，統計出了比轉速統計方程，並進行了水輪機主要參數選擇論證，提出了適合拉西瓦水電站水輪機的主要目標參數。
  8. It is concluded : the determination of the center spacing may be conducted under the permissible elevation of the exit line of seepage surface on slope surface downstream. in the end, the author has analysed the seepage field what the holes are placed two rows along the slope height

    另外，在對比多種孔距的方案分析結果的基礎上，得出結論：排水孔孔距變化對邊坡滲流場沿邊坡走向方向水頭分佈影響明顯，布設排水孔應根據目標降深確定排水孔孔距。
  9. Based on the lab orthogonal tests, using self - manufactured constant head permeameter, the effect of gravel content, void ratio and particle shape on the coefficient of permeability of soil - rock - mixture was studied

    本文採用室內正交實驗，利用自製的常水頭滲透儀，研究了礫石含量、孔隙比和顆粒形狀3個因素在不同水平下對土石混合體滲透系數的影響。
  10. Through the utilisation of this energy, which is left unused by nature, an energy source is tapped, with whose help a part of our energy requirements can be covered, which would otherwise have to be covered by fossil fuels. the excellent properties of the hydro - dynamic screw are its minimal disturbance to the environment, the environ - mental friendliness and long service life. a capacity of 0. 1 to 5. 5 cubic meter per second and a head up to 10 m, enables it to utilise hydrodynamic powers which are ruled out for turbines for reasons of cost

    水力螺旋發電機同傳統的水輪機和渦輪機相比具有優越性，其對環境的影響很低，環境友好且使用壽命長，而且高達5 . 5立方米秒的水體輸送容量和高達10米的水頭使其可以充分的利用水能，只要有1千瓦的能量也可以利用，運行效率遠高於渦輪機，且投資和運行成本低於渦輪機。
  11. The arrangement is applicable to the hydropower station with higher head or flow rate and has the advantages such as saving investment, flexible operation and simple electric installations ; which provides an another way with another alternative for hydropower station to select the hydro - generating facilities

    這種布置方式可適用於水頭或流量變化較大的水電站，具有節省投資、運行靈活、電氣設備簡化等優點，為水電站水輪發電機組設備的選擇提供了另一條途徑，增加了一個對比方案。
  12. On the basis of analysis for recharge, flow - off and drainage of research area, the paper concludes that the main possible cause for the fall of water head is groundwater exploitation by comparing the curve of rainfall - time and the curve of observation heads of some observation well

    在充分分析研究區補給、徑流和排泄規律的基礎上，文章通過比較降雨歷時曲線、部分觀測孔觀測水頭曲線得出開采量可能是影響水頭下降的主要因素。
  13. Standard test method for determining transmissivity and storage coefficient of low - permeability rocks by in situ measurements using the constant head injection test

    用恆定水頭噴射試驗現場測定低滲透性巖石的透過比和釋水系數的標準試驗方法
  14. Ceramic grain filters ard made of refined pottery clays added with certain modifiers, and processed of grinding, mixing, shaping and high temperature sintering. they do not contain any substances that harmful to people or environment. they are hard and rough in surface, porous inside the structure, and have the advantages of high mechanical strength, large specific surface area and porosity. when used in water treatment, they behave a activated surface property, a great amount of pollutant entrapment, less water head loss in the filter bed, lower consumption of back - flush water, stable in chemical and gbiologic property, and long service life, ceramic grain filters is a new and efficient filter material to increase the water yield, upgrade the water quality, and save chemicals and energy

    陶粒濾料是以精製陶土為主要原料，摻加適量改性劑，經粉碎，混練，成型和高溫煅燒而製成的，不含任何對人體和環境有害的物質.其表面堅硬，粗糙，內部疏鬆，多孔，具有機械強度高，比表面積大，孔隙率大的特性.用於水處理中，具有表面性狀好，截污能力強，過濾水頭損失小，反沖洗耗水量低，化學穩定性和生物學穩定性好，使用壽命長的特點.陶粒濾料是一種能增加水產量，提高出水質量，節省藥劑和能耗的新型高效過濾材料
  15. The open angle, head loss and hydrodynamic pressure under the rated flow and several kinds of proportion are carefully observed in the model test, and these results are given for reference in engineering design

    階段模型試驗中詳細觀測了在額定流量下，不同比重拍門的開啟角度，水頭損失及門體動水壓力變化情況，以供工程設計應用參考。
  16. The tubular turbines are the best selection for exploitation of tidal power and hydraulic power with extremely low heads and extremely large flow rates. they have large discharge, high specific and high efficiency, and need less excavation. they have been classified into bulb, pit, siphon and " s " types in the light of their structural types

    貫流式水輪機是開發特低水頭，特大流量水電站及潮汐發電的良好機型。該機具有開挖量小，過流量大，比轉速高等特點。按其結構型式分燈泡式豎井式軸伸式等。
  17. Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big

    在實際管道工程中，閥門閥道的局部水頭損失占管路水頭損失的比例是相當大的。
  18. Compared with conventionally rapid filter, upflow filtration is a more sensible filter method, which is characterized by large capacity for storage of solids, small head loss and long filter run

    上向流過濾是一種理想的過濾方式。與傳統快濾池相比具有濾層截污量大，水頭損失小，過濾周期長等特點。
  19. Compared to normal taps, this could amount to a saving of several hundred liters of water a day in toilets with a high visitor frequency

    對頻繁使用的衛生間，與普通水頭相比，吉博力感應頭每天可節水數百公升。
  20. It is more accurate than traditional method at the aspect of calculating head loss, pipe flow and node pressure of hydrant. this mathematic model can also be used in the inside and outside of water supply piping calculation and it is excel hardy cross - piping calculation

    該方法在計算水頭損失、管段流量、消火栓節點壓力等方面比傳統方法要更加準確，也可被借鑒到室內或室外的給水管網計算，並優于常見的哈代-克羅斯管網平差方法。
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