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压流
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  pressure flow
     The motion of water and sediment through underground culverts is in the state of pressure flow.
     地下涵洞穿越河渠淹没于水下 ,水沙运动呈有压流状态 ,合理利用洞内水流自身能量 ,才能确保输送泥沙过洞 .
短句来源
     The design of siphon pipes with a large turning diameter rectangle section is favourable to increase peak negative pressure values, make the pressure flow in pipe homogeneous and give bet-ter forciug state to the structure.
     大转弯半径的矩形断面虹吸管设计,对提高峰驼负压值、使管内压流均市和结构受力良好有利。
短句来源
     The tunnel is a familiar water release structure, when stream flows in the tunnel it will possiblely appear half pressure flow, which will produce a series of disadvantageous influences to tunnel structure, such as stressing state, discharge capacity and outlet energy dissipation.
     隧洞是常见的泄水建筑物,隧洞过流可能出现半有压流,从而对隧洞结构的受力状态、泄流能力以及出口消能等会产生一系列不利的影响。
短句来源
     Based on the test results on hydraulic characteristics of gate region of the Three Gorges Projects(TGPs) desilting bottom outlet, the problems of cavitation behind plane gate under high head and pressure flow condition during its operation are discussed, and the measures of decreasing cavitation or cavitation free operation are proposed.
     结合三峡电站排沙底孔闸门区水力特性试验研究成果,讨论了闸门后为有压流的高水头平面闸门在运行过程中空化空蚀问题,提出了减免空蚀的措施。
短句来源
     On the basis of the model test results, the paper presents the primary analysis on starting law of silt in the pressure flow state and proposes the empirical formulas used for non silting condition in underground culvert. The results fit well with experimental data.
     根据模型试验成果,对地下涵洞淤积泥沙在有压流状态下的起动规律进行了初步分析研究,提出了地下涵洞内不发生泥沙淤积的经验公式,其结果与试验资料吻合良好。
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  pressurized flow
     Due to the complicated flows in the stormwater drainage system(including subcritical and supercritical open channel flows,pressurized flow in closed conduit,side weir overflows,and transitional flows at junctions),a 1D numerical model of the unsteady flow is developed to study water stages and flow characteristics for different side weir arrangements,based on the observations provided by a 1∶22 undistorted Froude scale physical model under the steady inflow.
     本文建立了一个能处理明渠缓流和急流、封闭管道有压流、侧流堰和渠道汇合处过渡流于一体的一维水力数学模型,用1∶22正态物理模型恒定流下的结果进行验证。
短句来源
  “压流”译为未确定词的双语例句
     Study of Transformer Protection Based on Wave Character of Voltage-Current
     基于压流波形特征的变压器继电保护的研究
短句来源
     Pulmonary artery pressure and actived platelets were also measured (CD61,CD42b,CD49b).
     进行睡眠时监测,用彩色多普勒估测肺动脉压,流式细胞仪测定血小板活化分子CD61、CD42b和CD49b。
短句来源
     ANALYSIS OF REVISORY QUASI ONE DIMENSIONAL COMPRESSIBLE FLOW FOR GAS FILM FACE SEAL
     端面气膜密封修正准一维可压流分析
短句来源
     Our differentiated service approach of L2 domain over Ethernet based on IEEE 802.1P and 802.1Q.
     基于IEEE 802.1P和802.1Q的队列机制,采用逐跳选择式背压流控机制和头端阻塞保护机制消除拥塞,改善系统性能。
短句来源
     BOUNDARY ELEMENT METHOD IN TWO-DIMENSIONAL INCOMPRESSIBLE FLOW
     二维不可压流中的一种边界元方法
短句来源
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  pressure flow
The first results of growing ZnO/GaN/α-Al2O3 heteroepitaxial structures in a low-pressure flow-through reactor using chemical-vapor deposition and stimulation with a plasma of radio-frequency discharge are reported.
      
The first results on the preparation of (0001)ZnO/(0001)GaN/(0001) α-Al2O3 heteroepitaxial structures by CVD in a low-pressure flow-type reactor are reported.
      
A maximal pharmacological dilatation was induced with carbochromen and dipyridamol and the pressure flow relation of the regional resistances within the coronary circulation investigated.
      
Coronary resistance (pressure/flow) increased with both ERG and ATN.
      
Besides anatomy of the coronary venous system, the pressure flow relationship during retroinfusion and the efficacy of pressure-regulated selective retroinfusion for targeted delivery of drugs is reported.
      
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  pressurized flow
Periodic states in a pressurized flow showing a phase transition
      
Pressurized flow electrochromatography with reversed phase capillary columns
      
Pressurized flow electrochromatography (PEC) is a hybrid of capillary LC and capillary electroendosmotic chromatography (CEC).
      
application of electric fields, in addition to pressurized flow, i.e.
      
Pressurized flow is usually under positive pressure, but negative pressures can also be encountered.
      
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A second-order three-level scheme for solving three-dimensional compressible ideal flow problems is presented, and its stability is proved. By carrying out a large number of practical calculations of two-dimensional and three-dimen- sional flow problems, it is shown that advantages of the scheme are good accuracy, reduced computer time, simplicity of formulas, reduced program-hours, and adaptability to practical application. How to apply the scheme to flowfields with discontinuities is discussed in detail in...

A second-order three-level scheme for solving three-dimensional compressible ideal flow problems is presented, and its stability is proved. By carrying out a large number of practical calculations of two-dimensional and three-dimen- sional flow problems, it is shown that advantages of the scheme are good accuracy, reduced computer time, simplicity of formulas, reduced program-hours, and adaptability to practical application. How to apply the scheme to flowfields with discontinuities is discussed in detail in terms of some specific examples. How to construct the difference-nets for different configurations in different flow conditions is also analyzed. Finally, calculated results for some two-dimensional and three-dimensional complex configurations are given here. The results at fig. 8 are compared with the experiments of Ref. 4. It can be seen from the pressure distributions of Ref. 4 that there are really two subsonic regions in this kind of concave flowfields.

本文介绍一种求解三维理想可压流问题的二阶三层格式并给出它的稳定性证明。通过大量二维和三维问题的实际计算,表明此方法的优点是精度好,时间省,公式简单,程序量少,便于实际应用。文中对应用此法如何求解间断流场的问题,针对具体算例做了较详细的讨论。对不同外形在不同流动条件下,如何设计差分网格也做了分析。最后给出部分复杂外形的二维和三维计算结果。

The losses occured in air-flow of compressor cascade are mainly to be controlled by occuring developing and separting of boundary-layer on the surfaces of blade. Therefore, by means of adapting the theory of compressible turbulent boundarylayer, utilizing some characteristic parameters such as momentum thickness, form factor, energy factor and other combination parameters, and then supposing the flow model of simple-power of velocity distribution in the wake behind the cascade, a simplified calculating equation...

The losses occured in air-flow of compressor cascade are mainly to be controlled by occuring developing and separting of boundary-layer on the surfaces of blade. Therefore, by means of adapting the theory of compressible turbulent boundarylayer, utilizing some characteristic parameters such as momentum thickness, form factor, energy factor and other combination parameters, and then supposing the flow model of simple-power of velocity distribution in the wake behind the cascade, a simplified calculating equation for total pressure loss coefficient of subsonic and transonic cascades of the compressor is derived. The basic calculating equation derived would be used for predicting the total pressure losses of both design condition and off-design condition of the compressor cascade.In this paper, a new curvilinear method for correcting the gaseous compressible effect under higher subsonic and transonic intake condition upstream of the cascade is. presented.According to this basic equation, the total pressure losses, for given compressor cascade are calculated, and then tested on the plane wind tunnel at various conditions, both the results are in better agreement.

本文主要目的,是采用可压流紊流附面层理论,利用附面层理论中的一些附面层特性参数,如动量厚度、形状因子和能量因子以及其他组合参数等;采用栅后尾迹中附面层简单幂方气体速度分布;并在过去叶栅损失理论研究的基础上,推导出亚音速、跨音速二元叶栅总压损失简化了的计算方程。用它可以计算亚音速、跨音速压气机叶栅在设计工作情况和非设计工作情况下的二元叶栅总压损失。文中还提出了压气机叶栅在高亚音速、跨音速工作条件下,修正气体压缩性影响的新的图线方法。 按照所推导出来的叶栅损失计算公式,对给定叶型叶栅在不同工作情况下,进行了叶栅损失计算。另外,对给定叶型叶栅进行了吹风实验,测量出不同情况下的叶栅损失,两种数据进行了比较,得到较好的一致。

The localized stability for vortices in arbitrary forms in an ideal incompressible fluid is investigated by linear approximation. The effects of curvature of the vortex stream lines and of spiral vortex on the stability are considered. Some general localized stability criteria for plane vortex sheets and spiral vortices are derived. The criteria are clear and convenient for application in engineering investigation of vortex stability. In particular it is also indicated that there exist lower and upper delimitations...

The localized stability for vortices in arbitrary forms in an ideal incompressible fluid is investigated by linear approximation. The effects of curvature of the vortex stream lines and of spiral vortex on the stability are considered. Some general localized stability criteria for plane vortex sheets and spiral vortices are derived. The criteria are clear and convenient for application in engineering investigation of vortex stability. In particular it is also indicated that there exist lower and upper delimitations for vortex stability and all previous investigations are in the realm of lower delimitation. If the stability condition of upper delimitation is not satisfied in the inner zone of a wake vortex, there must appear a low pressure cavity which will cause the vortex partialy falling away or break down the vortex. Using the upper delimitation criterion the generation mechanism of the Taylor vortex and the Karman vortex street can be conveniently explained.

以线性近似方法研究了不可压流中任意形状旋涡局部稳定问题,考虑了流线曲率及螺线流动对旋涡稳定性的影响.得出了各类型二维旋涡局部稳定准则,这些准则直观简练,在工程研究中应用方便.研究表明,旋涡稳定存在上、下二种界限,前人的研究尽属下限稳定范围.当上限稳定条件不满足时,在尾涡内部会出现低压气穴并引起旋涡局部脱落或散裂.应用上限稳定准则可以方便地解释Taylor涡及Karman涡街现象产生的机理.

 
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