entrance velocity 中文意思是什麼
entrance velocity
解釋
進口流速-
So according to the technology regulation of reclamation engineering, hydraulic calculation must be carried out in the design of final closure. this paper firstly introduces the progression and present situation of reclamation engineering, emphasizing on the features of present reclamation and on the experiences and theories of home and abroad ; using fortran perfects the hydraulic calculation program of the closure and makes the program to meet different conditions ( such as considering flood, the variation of time interval, multi - entrance, multi - reservoir capacity ), and after comparing and analyzing a great deal of schemes, the reasonable computation scheme was brought up ; the interface of the program was carried out by the programming language vb to make the process of calculation become easier and more distinct, so the result can be analyzed and handled more directly ; vb is used in the later management of the result to plot the graphic chart of the isoline of the maximum of hydraulic element ( the velocity of flow, the drop height and the rate of flow ) automatically ; finally it was applied in the reclamation project of dongbidao of fuqing
本文首先介紹圍海工程的發展進程與國內外圍海的開發現狀，重點介紹了我國目前圍海工程的特點及在圍海工程實踐中積累的經驗和理論；利用fortran語言完善堵口工程龍口水力計算程序，使程序可以滿足圍海工程復雜工況下（如考慮內港洪水、計算時段的變化、多口門、多庫容、多水閘）的龍口水力計算，並進行大量方案的比較和分析，提出合理計算方案；利用面向對象的可視化編程語言vb進行界面開發，使計算過程有良好的人機界面，更直觀地對計算結果進行分析和處理；計算結果的后處理採用vb編程實現龍口水力要素最大值等值線圖的繪制；並運用所編軟體對福建省福清市東壁島圍墾工程進行龍口水力計算，為堵口合龍提供科學依據。 -
Seawall and sluice are the parts constructed in advance, while final closure is the last part in construction. the hydraulic condition during the final closure process is worse than that during any other processes. and with the compressing of the entrance, the hydraulic condition becomes badly, the drop height of entrance can reach 2 to 3 meter, the maximum velocity of flow even reaches 6 to 8 meter per second and flow condition also becomes complex
海堤和水閘的修建都是圍海工程先期施工的部分，堵口則是海堤修築的最後階段，堵口合龍成敗關繫到圍海工程成敗，由於此階段所遇到的水力條件十分惡劣，口門落差可達2 3m ，流速最大可達到6 8m / s ，且水流極其復雜，根據我國《圍海工程技術規范》規定圍海堵口必須進行龍口水力計算。 -
In this paper, high heat penetration into a moving particulate bed is described mathematically with a comprehensive heat and mass transfer model. the distribution of gas velocity and pressure, the temperature field of gas and solid in the moving particulate bed are examined for different conditions. the results show that thermal penetration into the moving packed - bed particles by fluid flow in porous media is high only in the position near the gas entrance. the thermal penetration thickness tends to increase with the fluid flow velocity and decrease with the particle moving velocity. in the region of thermal penetration, the porosity of solid bed has significant effect on gas field and pressure loss. it is feasible to reduce the gas pressure loss by a larger width / height packed bed in design and operation. the correspondence between thermal infection depth and particle bed height would be helpful to keep high oapacity of reactor and reduce the cost of operation
針對移動顆粒床中物料層內的高溫氣體滲流傳熱現象，考慮滲流與傳熱的相互作用，採用局部非熱平衡假設建立了多孔介質滲流傳熱物理數學模型並進行了數值計算.研究了不同情況下床內填充多孔介質中的流速、氣固溫度和床層壓力損失.計算結果表明，高溫熱氣對移動床顆粒料層的熱滲透主要發生在滲流入口端區域，增大入口滲流速度以及減小床層物料下移速度將導致物料溫度沿床高慢速下降，熱滲透深度擴大，熱滲透作用區域內的物料溫度水平提高.在熱滲透作用區域，孔隙率對流場和壓力損失有很大的影響.研究結果對于移動顆粒床反應器的設計與運行具有一定的參考作用 -
Relaxation factors are adopted. a program is produced to simulate swirling air flow in a horizontal straight pipe and compare with experiment data. the simulation prove that the modified k - model can predict the core, annular and wall regions near entrance and axial velocity far from entrance, but it ca n ' t predict tangential velocity well in weak swirling area far from entrance
編程計算水平圓管內螺旋氣流的流動參數並與實驗數據對比，結果表明修正-湍流模型在近入口處基本上能預測出中心區、環形區和近壁區的流動特性，在遠離入口弱旋流區域對軸向速度的預測符合實際情況，但是出現對周向速度修正過大的現象。 -
Some key technical problems about construction method, vehicle velocity and clearance of the tunnel scheme were discussed according to the geographical location, engineering geological conditions, request of the harbor entrance and shipping, localization of the tunnel and some principal technical criterions
根據泰州公路過江通道的地理位置、工程地質條件、港口航運要求、通道工程定位以及工程的主要技術標準等，對泰州公路過江隧道方案的隧道建設方法、隧道行車速度和建築限界等若干關鍵技術問題進行了分析論證。 -
The interactions between heat flux density, vapor pressure, vapor velocity and the coefficient of heat transfer for condensation in tube, the coefficient of heat transfer in total are investigated. the relationships between heat flux density and the total difference in temperature, the difference of temperature, pressure drop of vapor from the entrance of the tube to the exit are investigated as well
考察了冷卻水流量、溫度恆定條件下熱流密度、蒸汽壓力、蒸汽流速對冷凝傳熱膜系數及總傳熱系數的影響關系，同時考察了總傳熱溫差、蒸汽進出口溫差及壓差隨熱流密度變化的關系。 -
With these boundary conditions, the pressure field and the velocity field is visualized by numerical simulation. now, we can understand the complex flow field at the tunnel entrance from the images. these images are helpful for us to explore the complicated mechanism of the aerodynamic problems and make new aerodynamic model
通過對這個流場的可視化，使我們對洞口附近的復雜流場有一個直觀的了解，得出了高速列車從明線上到隧道洞口，再到隧道內時，隧道洞口附近的壓力場和速度場可視化結果，這有助於我們探索洞口復雜流場形成的物理機制，從而為我們進一步發現新的隧道空氣動力學問題，建立新的隧道空氣動力學概念和物理模型提供依據。 -
The paper analyses and compares the " factor effect on the flow in the pond by the numerical simulating software. the analysis shows the flow structures in the pond are not only related with the velocity of flow, angle of jet and the size of the entrance and so on, but also are related with the size of the pond
根據計算，論文對錐形閥消力池流態的影響因素進行了分析和對，比，分析認為，錐形閥消力池內的水流流態與入射水流的流速、入流t角度和進口尺寸以及水墊尺寸等反映淹沒撞擊射流的基本參數有關，也受消力池長度、寬度影響。
分享友人