空蝕數 的英文怎麼說

中文拼音 [kōngshíshǔ]
空蝕數 英文
cavitation number
  • : 空Ⅰ形容詞(不包含什麼; 裏面沒有東西或沒有內容; 不切實際的) empty; hollow; void Ⅱ名詞1 (天空) s...
  • : Ⅰ動詞1. (損失; 虧耗) lose 2. (腐蝕) erode; corrode Ⅱ名詞(天體現象) eclipse
  • : 數副詞(屢次) frequently; repeatedly
  1. ( 2 ) the emission spectra of laser ablation metal copper plasma were measured. the detailed mechanism of plume emission of cu plasma was qualitatively explained using a simple model based on excitation of atom and ion in plume arising from inelastic collision between the elemental species and electron with high kinetic energy. under the local thermal equilibrium model, the electronic temperature of copper plasma was deduced to be in the 104 scale by its emission lines

    ( 2 ) cu等離子體光譜:在420 570nm波長范圍內觀測了激光燒cu等離子體的光譜和各發射譜線在等離子體中的間分佈;比較了激光能量對cu等離子體發射光譜、電子溫度的影響;用局部熱力學平衡( lte )近似,測得cu等離子體的電子溫度為104k量級;在不同背景氣壓下,觀測了激光燒cu等離子體光譜的間分佈。
  2. 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,包括腔形態、徑向流速分佈及井壁壓強等;二、提出了豎井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,但依然較低,因此豎井的始終是工程界關注的重大問題。
  3. 4. three type of basalt is recognized in changle region : a, sapphire - embodied alkli - olivine - basalt of niushan group ( most distributed in fangshan ), enriched with a large number of mantle - orignated xenoliths with different extent of weathering ; b, alkli - olivine - basalt of niushan group with little sapphire embodied, but contan a few mantle - orignated xenoliths usually samller than that of fangshan, most of the mantle - orignated xenoliths weathered seriously only lefting with some vacant caves, this kind of rock mostly lies in cangshan, taohuashan. and qiaoguan volcanic vent, contain amount of ilmenite ; c, olivine - basalt of yaoshan group, contain neither xenoliths nor sapphire

    4 、在昌樂地區區分出三類主要的玄武巖: a ,牛山組含礦的堿性橄欖玄武巖,位於方山,含大量的大小不一的風化變程度不同的地幔巖包體; b ,牛山組幾乎不含礦的堿性橄欖玄武巖,含少量地幔巖包體,且包體一般比方山小,多已經遭嚴重風化而只留下洞,含有相當量的鈦鐵礦,主要位於北巖南部的蒼山,桃花山及喬官火山口。
  4. Further, the moving track of the cavity and its changing regularity of radius can be get along ~ vith the transformation of the pressure. in the calculation of this paper, matlab programming language is applied. in the past, fortran language is mostly used in scientific computation

    化現象與流場內的壓力分佈密切相關,根據壓力的分佈可以得到流場內的分佈,而的分佈決定了流場內的化。
  5. The company has cad design centre, precision etching and developing production line, chemical cleaning production line, scrubbing production line, high - power exposing machine, cnc drilling machine, suctioning silk screen machine, speedy press, vacuum multilayer press, chemistry sink copper and metal surface treating production line, punches, etc. import or domestic advanced equipment

    公司擁有cad設計中心,精密刻、顯影生產線,化學清洗生產線,磨板生產線,大功率曝光機,控鉆床,吸氣絲印機,快壓機,真層壓機,化學沉銅及金屬表面處理生產線,沖床等進口或國產先進設備。
  6. The paper mainly discussed the reasons of stress from liquid ammonia pressure vessel causing crack through examing data and experimental results and analysing relevant referential documents and materials, taking 1200 ammonia vessel ' s crack and leaking in a certain fertilization company as an example : there existed remaining welding, stress in the equipment ; there existed a stress decaying surrounding, i. e., moisture 0. 2 %, and temperature > - 5 with o2 or co2 inside ; the higher the intensity of raw materials, more possible it was to have stress decaying crack

    摘要以某化肥公司1200氨冷器殼體開裂泄漏的失效分析為例,通過對檢驗據和結果及有關文獻資料的分析研究,探究了液氨介質壓力容器產生應力腐裂紋的原因:設備中存在較高的焊接殘余應力;液氨介質具備應力腐環境,即含水量0 . 2 % ,且有氣( o2或co2 )污染(或摻入) ,使用溫度高於零下5 ;母材強度越高,應力腐裂紋產生的傾向就越大。
  7. The paper introduces and amends the composite indexes of soil erosion intensity and regional soil erosion intensity and conducts quantitative analysis on spatial relationship of types of land use and soil erosion intensity of whole china territory, the middle and lower areas of liaohe river, headwater area of danjiangkou reservoir of south - north water transfer project of hubei part and 4 regions of huidong county in guangdong based on sum up of general study methods of spatial relationship of land use and soil erosion

    摘要在總結土地利用與土壤侵間關系一般研究方法的基礎上,引入並修正了土壤侵強度綜合指和區域土壤侵強度綜合指,時整個中國境內、遼河中下游地區、南水北調丹江口水庫水源區湖北部分和廣東省惠東縣4個區域土地利用類型與土壤侵強度間關系進行了定量比較分析。
  8. It tell us : the abrasive capability of fly ash ; the similar calculation of ash erosion ; the calculation of ash erosion in the tube in turn and tube out of turn ; the reason of tube abrasion for gas flue ; the influence of air parameter for fly ash erosion ; the influence of changing temperature ; the influence of the flue gas composition, etc. next, it advances the solving measure ; reduce the flue gas velocity ; reduce the concentration of fly ash ; responsible construction : replace smooth tube with spiral tube ; use the new material of abrasion ; fuel desulfurization ; reduce so3 of flue gas ; raise flue gas temperature, making it up the dew point ; use the abrasion - resistance material to resist abrasion

    討論了飛灰磨損性能、管壁受飛灰沖的近似計算、灰粒對順列管和錯列管的磨損計算、煙氣走廊引起對流管束的磨損機理、氣動力參對飛灰沖的影響以及受熱面壁溫變化及煙氣成份對飛灰磨損的影響等問題。接著提出了解決的措施:降低平均煙氣流速;降低飛灰濃度;使用鰭片管、螺旋翅片管代替光管;選擇合適的結構及排列方式,減少煙氣中so3的含量;提高受熱面壁溫使之大於煙氣的露點溫度;採用抗腐材料作受熱面等防腐的措施。
  9. Based on the fractal character of the small watershed topographic feature, the spatial and temporal variation character of sediment yield of the watershed model, the dynamic developing process and fractal character of the topog raphic feature of the watershed model, and the coupling relationship between the sediment yield and the topographic feature of the watershed model are " studied by simulate experiment, fractal theory, high precise photogrammetry and gis technology. the validation research is conducted in chabagou watershed where the observation data of rainfall, sediment and runoff for 11 years is collected. the study provides new theory and method for the topographic feature quantitative research in the prediction model of small watershed sediment yield

    本文依據流域地貌形態所具有的顯著分形特徵,從模擬實驗出發,利用分形理論和方法,結合高精度攝影測量和gis技術,對流域模型侵產沙時變異特徵、地貌形態發育過程及其相應的分形特徵、流域模型侵產沙與地貌形態耦合關系進行了深入研究,並以具有11年降雨泥沙徑流觀測資料的岔巴溝流域為例進行了驗證研究,為實現從單坡面侵產沙模擬、預報向流域侵產沙模擬、預報轉化過程中地貌形態參的提取提供了理論和方法,為黃土高原小流域水土流失綜合治理提供了科學實踐依據。
  10. The numerical simulation and experimental research made on the characteristics of the clearance cavitations in kaplan turbine are described herein ; in which the analysis mainly is concentrated on the characteristics of leakage - vortex caused by the flow of the clearance between blade tip and blade chamber, that occurs at the front - pressure side of the blade, and the intensity of the secondary - flow - vortex ; furthermore, the relationship in between the leakage - vortex, secondary flow vortex, cavitations and erosion are analyzed as well

    摘要對軸流轉槳式水輪機輪緣間隙流動及化特性進行值模擬和試驗研究,重點分析輪緣間隙流動在正面頭部泄漏流動所引起的泄漏渦帶、二次流動的漩渦強度和化特性,以及泄漏渦帶旋轉、二次流動的漩渦與和磨損之間的關系。
  11. The logically division of inner space of soho residence will be the fashion choice of modern people for living and working. just as the old european buildings are still fit for living in modern time, even be built so many years ago, soho residence has its own lifehood

    Soho住宅的間分割的合理性,將是現代人時尚居住和工作的前衛選擇,正如歐洲古老建築之所以在風雨剝百年之後,依然適合現代居住一樣,必有其一定的生命力。
  12. Variations in pressure with and without aeration in cavitation region are measured and the compressible characteristics of pressure waveforms and relation between mach number and compression ratio are analyzed ; the time - averaged pressure profiles of different air concentration in cavitation erosion region are measured, the variations of the pressure with air concentration and effects of back pressure on cavitation erosion are analyzed ; the relations between least air concentration to prevent cavitation erosion and flow velocity are proposed ; the cavitation numbers with and without aeration in cavitation region are compared

    實測了化區摻氣前後壓力的變化,分析了壓力波形的可壓縮流特徵以及馬赫與壓縮比的關系;實測了區不同摻氣濃度的時均壓力分佈,分析了壓力隨摻氣濃度的變化及背壓對的影響;提出減免的最低摻氣濃度與流速的關系,比較了摻氣前後水流的
  13. There are a lot of advantages when inner trachea applied in air pre - heater, such as the improvement of the temperature of pipe, the low consumption of metal, except for the increment of flow resistance. according to many related papers, it is more proper inner trachea with the structure of short distant between two whorls and shallow depth of whorl. it can enhance heat transfer with smaller flow loss

    內螺紋管是一種異形管,和光管相比,管內側的換熱系大大增強了,應用於氣預熱器可以起到提高總傳熱系、節約受熱面金屬消耗量的目的;同時提高了管壁溫度,能夠減輕低溫腐的程度和速度;不足之處是帶來了更大的阻力損失。
  14. Jayaram s, myklebust a, gelhausen p. acsynt - a standardsbased system for parametric computer aided conceptual design of aircraft. aiaa 92 - 1268

    劉祖銘,曹定國,吳有金,張金華,王浩偉,羅家樞.飛機結構腐控制設計據庫研究.航學報, 2002 , 23 ( 4 ) : 360 363
  15. They are widely applied in the tower of coking desulfurizing, benzene scrubbing, naphthalene scrubbing, ammonia scrubbing and chemical fertilizer hot water saturation tower, electric power plant wet cooling tower

    該系列填料具有比表面積大、隙率高、傳質系大、抗堵塞、抗腐、耐急冷急熱、使用壽命長、易安裝的優點,是一種理想的塔填料。
  16. Finally, based on the need analysis of the system and its design, with the comgis software supermap 2000 which made in china, the author developed the integrated system in visual basic and applied it in assessing the sensitivity of fujian provincial soil erosion and the sensitivity of fujian provincial ecology environmental acid rain

    在此基礎上,通過對系統的需求分析、系統功能的分析與設計、系統據庫設計,系統間分析設計與演算法實現,在國產全組件式gis軟體supermap2000平臺上,在visualbasic可視化開發平臺中實現了系統的集成,並成功地應用在福建省土壤侵敏感性評價與福建省生態環境酸雨相對敏感性評價中。
  17. Through the analysis, it is shown that : 1, while fabricating the grating, the principle of selecting the parameters is : the period should be as large as possible, the etching depth should be small and filling factor should approach to 0. 25. 2, if selecting the parameter combine the selecting principle and the requirement of concrete application, the space of selecting the parameter should be larger than before. 3, while the period to. 4a, the surface profile has no effect on the reflectivity

    通過分析發現: 1 、在製作有一定特性的光柵時,光柵參的選擇原則為:周期的取值應盡量的大,刻深度的取值應盡量的小,占比的取值應盡量靠近f = 0 . 25 ; 2 、以參的選擇原則結合製作的具體應用要求宋選擇光柵的參,則各個參的優化間更大; 3 、當光柵的周期t 0 . 4時,表面面形對反射率沒有影響; 4 、運用臨界周期點隨折射率的變化規律,可以避免由於選擇光柵周期過大而出現一級衍射,從而導致製作失敗。
  18. The sense of this work is to gain a further understanding of helium in the two metals. on the diffusion of helium - 3 in two spherical shell samples made of 21 - 6 - 9 type of stainless steel, during the storage of tritium at the pressure of 6. 13mpa for about 4 and 6 years at room temperature and later exposed to air for another 3 and 1 year. first, a calculation based on the analytical and numerical method to the diffusion and decay theories was developed to evaluate the concentration distribution of helium - 3 by tritium diffusion and decay in the samples

    在不銹鋼氚衰變~ 3he的擴散行為研究中,建立了氚和~ 3he濃度分佈的解析解和值計算方法,以評估充氚不銹鋼球形容器壁中氚衰變~ 3he的宏觀濃度分佈,同時還用值計算方法以求解氚和~ 3he的多步擴散行為;對樣品表面逐層刻、同時收集釋放的~ 3he進行分析,分別實測了經室溫條件下在6 . 13mpa高壓氚中貯存4年和6年、氣中存放3年和1年的兩種21 - 6 - 9不銹鋼球殼樣品內壁中~ 3he濃度分佈;結果表明:由於he在金屬中的不可容性, he原子偏聚于不銹鋼表面以及內部的局部區域,在整體趨勢上, ~ 3he分佈與計算結果相一致,根據理論計算,兩種21 - 6 - 9不銹鋼球殼樣品內壁中~ 3he到達的深度分別為350 m及500 m 。
  19. Finally, according to the technique of plasma etching, an evolution model describing the spatio - temporal profiles of the micro - trench is established. and that we simulated the effects of collisions and the source parameters on the etching profiles

    最後,針對等離子體刻工藝,建立了微結構區剖面的時演化模型,並模擬了碰撞效應和電源參對刻剖面演化的影響。
  20. And that system has a great help especially for the safeguard and solving cases. aimed at advancing the speed of extracting the key characters, improving the veracity, cutting down the cost of time and space, this task put forward a new template thinning algorithms after analyzing the principle, disadvantages and advantages of many thinning methods including condition thinning, template thinning and thinning in morphology maths. this algorithm with good collection has less thin - hair, and avoid excessive erosion

    為了使計算機識別時能很快的提取關鍵特徵,提高準確度,減少時耗費,本課題在分析了多種傳統的條件細化、模板細化、形態學上的細化等多種細化方法的原理和優缺點后,提出了一種新的模板細化演算法,該演算法毛刺較少,避免了過度的腐,同時具有良好的連通性。
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