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cavitation     
相关语句
  空化
    Study on Mechanism of Incipient Cavitation and Scale Effect of Cavitation
    空化初生机理及比尺效应研究
短句来源
    Laboratory Study of Cavitation Problems of the Invert in Steep Open Channels
    陡坡明槽反弧段空化问题的试验研究
短句来源
    Estimation of incipient cavitation number by a probability method
    绕流体初生空化数的概率估计
短句来源
    THEORITICAL PREDICTION OF CAVITATION INCEPTION --FUZZY CAVITATION SYSTEM
    空化起始的理论预测——模糊空化系统
短句来源
    The Characteristics of Cavitation and Fluctuation for Multi-Orifices
    多级孔板空化与脉动壁压特性
短句来源
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  气蚀
    The experiment lays pressure sensors to measure the pressure of the discharge system, and the measure results show that cavitation erosion will never happen during outflow.
    通过布设压强传感器实测排水系统的压强,结果表明排水系统不会发生气蚀
短句来源
    The phenomena occurring in high speed water flow, such as cavitation, aeration, fluttering pressure and energy loss etc, are all related with the development and behaviour of the turbulent boundarylayer.
    气蚀、掺气、脉动压力、能量损失等高速水流问题都与紊流边界层的发展和特性有关。
短句来源
    Aiming at minimizing the flow loss of the cascade surface boundary layer and airfoil cavitation erosion,a unified objective function was established by using Distance Method and the best bone line was worked out by applying the genetic algorithm.
    然后以平面叶栅表面边界层中的流动损失最小和翼型气蚀系数最低为多目标,用距离法构造二者统一的目标函数,利用遗传算法来搜索最佳的骨线形状。
短句来源
  空蚀
    Experimental Research on Effect of Variation of K_σ on Cavitation of Blades
    K_σ值变化对叶片空蚀面积的影响的试验研究
短句来源
    Theoretical analysis and experimental study of speed effect of incipient cavitation erosion number
    初生空蚀数速度效应的实验研究及理论分析
短句来源
    Summary of study on ogee-section cavitation in longtaitou spillway tunnels
    龙抬头泄洪洞反弧段空化空蚀研究综述
短句来源
    Experimental study on air concentration to prevent cavitation erosion
    减免空蚀掺气浓度的试验研究
短句来源
    Research on cavitation damage and figure optimization for spillway tunnel of Yunlong Reservoir
    云龙水库泄洪洞空蚀及体形优化研究
短句来源
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  空泡
    FLOW CONTROL ON UNSTABLE CAVITATION PHENOMENA
    空泡流非稳态现象的流动控制
短句来源
    Part two: Study on the cavitation noise. The extend work of my doctoral research is introduced in the part. Problems of cavitation noise are investigated with three methods such as theory analysis, numerical simulation and experiment research.
    第二部分:空化噪声研究该部分工作是作者博士期间工作的延续,对空化噪声问题从理论分析方面、数值模拟及实验三方面进行研究,应用作者提出的混合边界元方法求解了空泡在边界附近溃灭时的辐射噪声问题。
短句来源
    Based on the bubble dynamics and the probability theory, a method for estimating the incipient cavitation number is suggested.
    基于空泡动力学及概率统计理论,本文建议了一种预测绕流体初生空化数的方法。
短句来源
    The incipient cavitation number consists of Weber's number W and M- relative velocity of cavitation bubble explosion.
    初生空化数由韦伯数W和空泡相对膨胀速度M所组成。
短句来源

 

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  cavitation
The cavitation erosion damage process of dynamically loaded journal bearings
      
The cavitation damage model was built using finite element analysis software MSC.Marc.
      
This paper attempted to numerically analyze the action process based on damage mechanics when a jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion.
      
The strain history and damage evolvement of bearing material acted on by jet impact load can be calculated efficiently using the proposed method, which develops a new method of analyzing cavitation erosion failure of the bearing surface.
      
Based on the variational constraint approach, the variational form of Reynolds equation in hydrodynamic lubrication is revised continuously to satisfy certain constraints in the cavitation zone of oil film field.
      
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The paper begins with a theoretical analysis of potential flow for the two-di- mensional conduit inlet,and after the boundary curve of constant pressure is obtained, it is transformed to the case of axial symmetry.It is hoped that the pressure along the new boundary,be nearly constant.The method of transformation is mainly that for equal distance ratios(i.e.,distance divided by entrance width in the two-dimen- sional case and that divided by entrance diameter in the axially symmetrical case), area ratios(i.e.sectional...

The paper begins with a theoretical analysis of potential flow for the two-di- mensional conduit inlet,and after the boundary curve of constant pressure is obtained, it is transformed to the case of axial symmetry.It is hoped that the pressure along the new boundary,be nearly constant.The method of transformation is mainly that for equal distance ratios(i.e.,distance divided by entrance width in the two-dimen- sional case and that divided by entrance diameter in the axially symmetrical case), area ratios(i.e.sectional area divided by entrance area in both cases)are equal. The pressure distribution along the curved wall of an axially symmetric inlet so obtained was calculated by the relaxation method,and that of another was measured from an air-flow model test.The results as given in Figures 10 and 13 of the paper show that although the pressure along the wall is not constant,the variation is not great.The paper finally suggests that as for to reduce the possibility of cavitation, the forms of the axially symmetric inlets given by Equations(5)and(6)of the paper may be considered as adequate for practical cngineering use,with the restriction that the value of k which appears in the two equations not be greater than 0.05,in order to prevent the possible separation of flow from the inlet wall.

文中给出了隧洞进水口曲线为等压的二元分析结果,然后将此二元进水口的曲线形式转变为轴对称进水口的曲面形式。所用的转变方法是:当 x/D=(x_1)/B时,d/D=(b/B)~(1/2),其中 d、x和 D 分别为轴对称进水口段中某断面的直径,由起始断面至该断面的距离和起始断面的直径;b、x 和 B 分别为相应二元情形的某断面的宽度,由起始断面至该断面的距离和起始断面的宽度。对用这种方法得到的一个轴对称进水口曲面上压力分布,进行了松弛法计算,还对另一个进行了气流模型试验。结果如文中图10及图13指明,曲面上压力虽然不是等值的,但变化不大。文中建议,就减蚀的意义而言,式(5)和式(6)所给轴对称进水口曲面的形式是可以考虑来作为实际工程上应用的,但为了避免可能发生水流从边壁上脱离的现象,式中 k 值应取小于或等于0.05。

Applying the laboratory test data obtained by J. W. Holl and D. Colgate, this paper tries to estimate the required control of surface irregularities for high overflow dams so as to avoid the incipiency of cavitation damage. By plotting the prototype observation data of five overflow dams, an empirical equation of the velocity coefficient φ as a function of H/q~(2/3) is first established. Thereby, with given H and q, the various valuesof the surface shooting flow for the non-aerated case, such as depth,...

Applying the laboratory test data obtained by J. W. Holl and D. Colgate, this paper tries to estimate the required control of surface irregularities for high overflow dams so as to avoid the incipiency of cavitation damage. By plotting the prototype observation data of five overflow dams, an empirical equation of the velocity coefficient φ as a function of H/q~(2/3) is first established. Thereby, with given H and q, the various valuesof the surface shooting flow for the non-aerated case, such as depth, mean velocity,Froude number, and cavitation index may be determined. The experimental data given by Colgate have been analysed and the cavitationindices of the two test specimens have been calculated. The four “σ_i~△/δ” chartsas given by Holl are put into a single diagram, in which the results of Colgate are alsoincorporated. Based upon the prototype observation data of the Norris Dam, Glennmaggie Dam, nd Werribee Weir, an empirical equation for the boundary layer thickness is established, and a comparison of the equation with those given by W. J. Bauer—V. T. Chow and G. Halbronn is made. With the diagrams and equations so obtained, the incipient cavitation index and the corresponding allowable maximum surface irregularities can be estimated. In the final part of the paper, the limit of the cavitation index has been suggested below which special treatment of the concrete surface such as used in the Hungry Horse Dam should be adopted.

本文对于迫切需要解决的溢流高坝避免发生室穴現象的問題,根据現有室內試驗及原型观測資料,进行了初步估算。首先綜合了赫尔(J.W.Holl)及柯尔盖脫(D.Colgate)的室內空穴試驗資料。其次根据五个工程的原型观測資料,得出流速系数φ与H/q~(2/3)的經驗关系,从而可依次求得不掺气射流水深d、平均流速v、傅汝德数F、泄洪空穴数σ与H、q的关系。再次,根据三个工程的观測資料,得出估算边界层厚度的經驗公式,与鮑尔(W.J.Bauer)——周文德公式及哈尔勃龙(G.Halbronn)公式进行此較。綜合运用上述資料,可将溢流高坝的泄洪空穴数σ和不平整度△发生联系,估算坝面的平整度要求或单寬流量的限制值。最后,对于混凝土溢流面参考餓馬(Hungry Horse)坝隧洞衬砌进行特殊处理的空穴数界限,提出了初步意見。

The present investigation is concerned with the determination of pressure distribution along curved boundaries formed by circular arcs often found in hydraulic structures. The boundary geometry considered are: (1) Semi-infinite pier in closed conduit with head part formed by two circular arcs, (2) Isolated circular-arc irregularity on the wall of closed conduit. Analytical results. found by means of conformal transformation were compared with experimental data from wind tunnel and water tunnel tests, and with...

The present investigation is concerned with the determination of pressure distribution along curved boundaries formed by circular arcs often found in hydraulic structures. The boundary geometry considered are: (1) Semi-infinite pier in closed conduit with head part formed by two circular arcs, (2) Isolated circular-arc irregularity on the wall of closed conduit. Analytical results. found by means of conformal transformation were compared with experimental data from wind tunnel and water tunnel tests, and with those obtained in previous investigations. Data on incipient cavitation number found from water tunnel tests and from published papers were compared with some of the calculated—C_(pmin). Agreement is good.

本文分析和計算了管道中沿三种圓弧形边界的压力分布,并給出了最小压力系数:(1)由二对称圓弧組成的閘墩头部;(2)边墙的半弓形突体;(3)边墙的弓形突体.根据最小压力系数和有关空穴发生的縮尺影响方面的研究,即可估計原型的初生空穴数.为了防止水流发生塞穴,設計的过水空穴数不得小于此值.

 
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