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characteristics of flow     
相关语句
  水流特征
     Characteristics of flow in Plunge pool and Its Comprehensive Evaluation Index
     水垫塘的水流特征及其综合评价指标
短句来源
  流动特性
     The characteristics of flow rate-pressure were evaluated. Findings indicated that for the micron round channel with inside diameter 20 μm, 50 μm and 100 μm, its flow characteristics fit close to the normal flow.
     研究结果表明,对于内径20μm、50μm和100μm的微圆管道,其流动特性与常规流动基本吻合;
短句来源
     The structure of flow and the characteristics of flow behind all these five bluff-bodies were analyzed and a new basis for succulent hot experiment was given.
     通过对钝体后的尾迹结构和流动特性进行分析,为热态实验奠定了基础.
短句来源
     Based on the approximate analytic solution, the choked characteristics of flow in adiabatic capillary tubes are theoretically analyzed.
     基于近似解,对绝热毛细管壅塞流动特性进行了理论分析。
短句来源
     In this paper the characteristics of flow in open channelwith different beds under different disturbs are measuredsystematically in laboratory flume with Acoustic DopplerVelocitimeter (ADV) and flow visualization device of waterdyeing.
     本文在实验室水槽中,利用声学多普勒流速仪(ADV)和染色液流动显示装置,较为系统地测量了明渠水流在不同床面和不同扰动作用下的流动结构与流动特性
短句来源
     Eulerian multiphase model and porous media model were applied in the condition of different flow control device and the characteristics of flow in the tundish with gas blowing at the bottom was mathematically simulated.
     采用欧拉两流体模型以及多孔介质模型,通过数值模拟方法研究了在不同气幕挡墙配置方式下中间罐内钢液的流动特性
短句来源
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  流量特性
     In the last part, the mechanism of effervescent atomization is used to deign three times atomizer. The characteristics of flow rate, atomization and combustion test were carried out.
     最后,基于先进的气泡雾化理论,把气泡雾化的机理应用于内混空气雾化喷嘴的设计中,设计出了三次雾化内混式空气雾化喷嘴,进行了喷雾实验、流量特性试验和喷油点火试验。
短句来源
     This paper describes the structure composition and operation of the electric explosion- proof V-ball valve, analyses the characteristics of flow rate and the influence factors, and discusses the principle and key point of explosion-proof design. The traditional structure of the valve is greatly improved so that the new kind of V-ball valve has the following advantages : high precision of adjustment, good safety of explosion-proof, reliable sealing, low driving torque and long life of use.
     阐述了电动防爆V形球阀的结构和工作原理,分析了其流量特性及影响因素,提出了防爆设计关键问题,对V形球阀的传统结构设计进行了大的改进,使新设计的V形球阀具有调节精度高、安全防爆、密封可靠、驱动力矩小、使用寿命长的优点。
短句来源
     Experiments on characteristics of flow rate in electronic expansion valve running in an air cooled heat pump at certain conditions were carried out.
     结合制冷系统的实际运行工况对电子膨胀阀流量特性进行了试验.
短句来源
     Its working principle and characteristics of flow were analyzed,the optimal mathematic model was established,and a living computation example was presented.
     分析了其工作原理和流量特性,建立了优化数学模型,并给出了计算实例。
短句来源
  流特性
     Research on characteristics of flow around cavitating body of revolution
     回转体空泡流特性研究
短句来源
     An investigation into the impact characteristics of flow distribution in axial piston pump using rotary valve plate for displacement regulation and the improvement on it are presented in this paper, main calculation formula and chart are built. An optimal design of valve plate can be ob-tained by emploving them.
     本文研究利用旋转配流盘调节排量的轴向柱塞泵配流特性及其改善方法,建立了基本计算公式和图表,按照这些计算公式和图表设计配流盘可以获得最佳设计结果。
短句来源
     Characteristics of flow around cavitating body of revolution was researched with a single-fluid with variable density approach based on Rayleigh-Plesset equation, what is called mixture model embodied in commercial CFD code Fluent 6.0. The first investigation was on geometrical and drag characteristics of partial cavity around some bodies with distinct head-forms by employing a 2D axisymmetric solver.
     利用CFD商业软件Fluent6.0中的基于Rayleigh Plesset方程的单一介质可变密度混合模型进行了回转体空泡流特性研究。
短句来源

 

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      characteristics of flow
    Calculations of the basic characteristics of flow around bodies entering the atmosphere in the continuousmedium regime are reviewed.
          
    The rheological characteristics of flow of the air stream past the drops of molten metal have a pronounced influence on the processes of heat and mass exchange between the particles and the surrounding atmosphere.
          
    Some Metrological Characteristics of Flow Meters in Which the Coriolis Force Is Used
          
    The method is based on design modifications of the measurement system sensing devices with a view toward affecting the local characteristics of flow past the total- or static-pressure intakes.
          
    Technique for computing characteristics of flow-type electrical transducers
          
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    The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for...

    The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for the reproduction of main hydraulic and thermal characteristics in models; and on the other hand, it should be practical to satisfy the criteria in ordinary hydraulic laboratories. The similarity laws thus obtained are presented in equation (17). When the room temperature and moisture content can be controlled and adjusted the similarity laws as shown in eq. (13) are recommended. A series of verification tests and field observations were carried out in the following years, the latter being made in two cooling reservoirs. In one of the reservoirs, which has an average water depth of 4.5m and a surface area of 5 km~2, general flow pattern of the surface layer and of the bottom layer of the thermal density current was observed. They were well verified in a model with length scale L_r=250 and depth scale Z_r=40. The other cooling reservoir is a much smaller one, with surface area of only 9000 m~2 and an average water depth of 2.5m. Besides flow characteristics, the variation of the temperature field of the reservoir and of the total heat balance with respect to time were carefully measured. A model with L_r=15 and Z_r=6 served to verify the hydraulic and thermodynamic data obtained in the field. The paper is a collective report, including the derivation of the similarity law and its verifications, and a discussion of the scale effects.

    冷却池中的水流运动,由于存在着水流本身的溫差作用及池面的散热受热作用,其运动規律,要較一般水流运动規律复杂得多;其模型相似条件,亦极难全面滿足,本文从整个水池的基本相似要求出发,着重考虑了水面溫度場相似的要求,提出了模型律;对存在着的比尺矛盾作了一些探討,并在室內和現場作了一些試驗驗証。几年来的試驗实践說明,虽然目前的模型相似問題,还有不少环节沒有解决,直接用热水作为試驗介貭的模型試驗,不失为規划冷却池工程布置和估計水面散热能力的一种有效工具。

    By adopting the critical depth ye and critical slope σ as the parameters for flow depth and bottom slope respectively,this paper presents the unified nondimensional computation method for 15 types of flow profiles in trapezoidal open channels with five classes of bottom slopes.Some new ideas for the characteristics of flow profiles have been explored by examples of computation and plotting of the generalized nondimensional φ(u) function.Furthermore, this paper indicates that it is improper to use symbols...

    By adopting the critical depth ye and critical slope σ as the parameters for flow depth and bottom slope respectively,this paper presents the unified nondimensional computation method for 15 types of flow profiles in trapezoidal open channels with five classes of bottom slopes.Some new ideas for the characteristics of flow profiles have been explored by examples of computation and plotting of the generalized nondimensional φ(u) function.Furthermore, this paper indicates that it is improper to use symbols σe and σo to represent the critical slope corresponding to the critical depth ye and normal depth y0 respectively,since if the discharge Q is a given value, σe and σo must be identical. Usually, the hydraulic exponent for trapezoidal open channel is suitable to be represented by n and m, or it is not reasonable to use a single value n, besides the exception of shallow wide rectangular section.

    本文采用临界水深y_c及临界坡降σ分别作为水深及底坡的参数,对五类坡底的梯形渠道内15种水面线,提出了统一的无尺度计算方法.通过对微分函数式的计算及作图举例,进一步阐明了水面线的一些特性. 文中还指明,在流量为给定值的条件下,相应于临界水深y_c的σ_c和相应于正常水深y_0的σ_0必然相等,而且从σ的定义就不应给以不同的符号.除了浅宽矩形断面的特例外,水力指数不是单一的n值而应区别为n及m二值.

    In this paper, the early stages of unsteady flow around a circular cylinder, started impulsively from rest and subsequently moving with a constant velocity perpendicular to its axis, are studied by coupling discrete vortex potential flow theory with boundary layer theory. The flow is considered to be laminar and the Reynolds number in high. development in time of vortex motion, characteristics of flow field, boundary layer separation point and drag coefficient are given in detail. Results of coupled calculation...

    In this paper, the early stages of unsteady flow around a circular cylinder, started impulsively from rest and subsequently moving with a constant velocity perpendicular to its axis, are studied by coupling discrete vortex potential flow theory with boundary layer theory. The flow is considered to be laminar and the Reynolds number in high. development in time of vortex motion, characteristics of flow field, boundary layer separation point and drag coefficient are given in detail. Results of coupled calculation contain the interactions between boundary layer, external potential flow field and near wake. The calculated development of symmetric vortex posseses many of the observed features in flow field visualization. Pressure and velocity distributions are also given. The drag coefficient obtained is in excellent agreement with experiment. In the calculation of boundary layer separation point, the Startford method is applied to the quasi-steady boundary layer state. The calculated result is better than those given by others and the computation is simpler. Shedding times and locations of discrete vortices, which have been generated before the boundary layer reaehs the qusi-steady state, are determined according to the unsteady M. R. S. criterion. The effect of these initial discrete vortices on the main vortex development and flow field is also discussed.

    本文用离散涡位流理论与边界层理论相结合的方法,研究高雷诺数、不可压、层流情况下圆柱非定常运动的初期流动(圆柱由静止突然起动而后保持匀速运动),给出了柱后旋涡发展的详细过程;流场分布、边界层分离点及阻力等随时间的变化规律。本文耦合计算结果包含了流动过程中边界层、外流与近尾迹三者的相互作用。计算所得的旋涡发展与实验显示的图象十分相似,物面压力与速度分布合理,阻力计算与实验结果相符很好。在分离点耦合计算中将stratford方法应用到准定常边界层情况,计算方法简单结果也较满意。对于准定常变化前分离产生的离散涡,其脱落时间和初始位置,本文根据非定常M. R. S. 分离准则确定。文中还讨论了这些离散涡对柱后旋涡发展及流动的影响。

     
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