air-flow diffusion 中文意思是什麼

air-flow diffusion 解釋
氣流擴散
  • air : n 1 空氣，大氣。2 天空，空中。3 微風，和風。4 態度，樣子，風度，氣派；〈pl 〉高傲的架子。5 傳播，...
  • flow : vi 1 流，流動。2 （血液等）流通，循環。3 流過；川流不息；（時間）飛逝；（言語等）流暢。4 （衣服、...
  • diffusion : n. 1. 散布，發散。2. 傳播，普及。3. 冗長。4. 【化學】滲濾。5. 【物理學】擴散，漫射。
  1. The porous diffusion type silencer is widely used to reduce the air flow noise because of its small volume and high noise attenuating ability. the out case of the silencer plays a very important role in reducing noise. the effect of the hole ' s shape, diameter and the distance between neighboring holes as well as the matchup between the case and the sound absorbing material tube are investigated experimentally. the relation between the out - flow noise and the gas velocity distribution is carefully studied for two different kinds of matchup between the case and the sound absorbing material tube. some useful results are gotten, which may be valuable to the design of the silencer

    多孔擴散型消聲器由於其體積小、消聲性能高而廣泛應用到排氣噪聲的降低上，其外殼對消聲器的消聲性能具有重要作用.本文對此類消聲器外殼的孔型、孔徑和孔距以及外殼同消聲材料的配合方面進行了細致的實驗研究，特別對外殼與消聲材料的配合與其排放噪聲以及外部流場之間的關系進行了探討，得到了一些有用的結論，對消聲器性能的提高具有一定指導意義。
  2. Then a one - dimensional unsteady incompressible flow with moving pollutant source model was proposed. the continuity equation, momentum equation and convection - diffusion equation were discredited using finite volume scheme. thus a software for predicting the air velocity and pollutant in railway double track tunnels was developed

    接著，根據雙線鐵路隧道運營通風的特點，建立了一維不可壓縮非恆定流和流動污染源的物理模型以及山相應的連續性方程、動量方程和對流擴散方程構成的數學模型；在此基礎上，利用數值計算方法，編制了一套雙線鐵路隧道運營通風的數值計算程序。
  3. Air distribution and air diffusion. aerodynamic testing and rating of constant and variable flow rate single or dual duct boxes and single duct units

    空氣的分配和擴散.恆定和可變流量單管或雙管箱和單管裝置的空氣動力學試驗及評價額定值
  4. The result indicates that when the air content of the concrete changes from 1 to 4 percent, the polarized resistance of the identical flow electricity time increases along with the increment of the air content, the corrosion current density reduces along with the increment of air content, the chloride ion diffusion coefficient reduces with the increment of air content ; when air content changes from 4 to 6 percent, the rule of the change of the polarized resistance and corrosion current density happens to be the opposite, the diffusion coefficient of the chloride ion increases along with the increment of air content ; when the air content is 4 percent, the rust - resisting property of concrete is best, and so is the impermeability of the concrete

    試驗結果表明，混凝土的含氣量在1 . 9 % ~ 4 . 2 %變化時，極化電阻隨含氣量的增大而增大，腐蝕電流密度隨含氣量的增大而減小， cl -擴散系數隨含氣量的增大而減小;當含氣量在4 . 2 % ~ 6 . 4 %變化時，極化電阻、腐蝕電流密度和cl -擴散系數的變化規律則相反;當含氣量為4 . 2 %時，抗鋼筋銹蝕性能最佳，抗滲性最好。 cl -擴散系數與鋼筋銹蝕參數在一定程度上有著良好的相關性，抗滲性的結果較好地反映了混凝土中鋼筋銹蝕的程度，可以用cl -擴散系數評價引氣混凝土的抗鋼筋銹蝕性能。
  5. The unsteady. flow theory is used for calculate air flow velocity and one - dimension unsteady convection - diffusion model is used for calculate pollutant concentration ( called unsteady theory model in general, utm ), and a new tunnel control method based on utm and neural network model is developed

    本文首次採用更符合實際情況的隧道氣流?維非恆定流理論和污染物濃度?維非恆定對流擴散模型（統稱非恆定流理論模型）進行隧道通風控制方法的研究，並提出了一套基於非恆定流理論和神經網路模型的新的隧道通風控制方法。
  6. Standard test methods for water vapor diffusion resistance and air flow resistance of clothing materials using the dynamic moisture permeation cell

    使用動態透濕單元法測試布質材料耐水蒸氣擴散性和耐氣流性的標準試驗方法
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