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secondary flows
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  二次流
     The results show that at δ=0.5mm tip clearance due to decrease secondary flows loss the exicted vibration energy of flow is increased, then the scope of blade stall flutter is enlarged and the flutter-boundary is removed forward.
     实验结果表明,对δ=0.5mm的叶尖间隙,由于二次流损失减少,气流激振能量增加,使叶片失速颤振区的范围扩大,颤振边界前移。
短句来源
     The results indicate that the algorithm can be used to accurately simulation the complex flow phenomena including the interaction of the shock wave and the boundary layer, flow separation and strong secondary flows in the turbomachinery.
     计算表明 ,该方法不仅可以准确地捕捉叶轮机械内部流动中出现的激波与边界层、激波与尾迹相互干扰等流动现象 ,而且也适用精确模拟不同工况下 ,特别是大攻角工况下带有分离流和强二次流情况下叶轮机械内部更加复杂的流动。
短句来源
     This paper experimentally investigates three-dimensional velocity and cross-sectional pressure distributions in a gooseneck-like pipe. Three-dimensional flow structures in the pipe were analyzed. Characteristics of boundary-layer separation, and mechanisms of secondary flows due to bending and non-circular cross-section effects in the pipe were examined.
     本文通过试验量测了鹅颈型管道水流的三维流速分布 (不同层面和断面的纵向、垂向及横向流速分布 )与断面压力分布 ,剖析了鹅颈型管道的三维水流结构 ,揭示出鹅颈型管道边界分离的特点及二次流 (弯曲二次流及非圆形断面二次流 )的形成机理 ,提出了鹅颈型管道固有的水流型态 ,水力特性及概念
短句来源
     To compare the impact of end-wall suction on radial secondary flows in the blades, end-wall suction has been performed on two sets of cascades with their aspect ratios being 2.53 and 0.3 respectively under the condition that the upper and lower end-walls have a same suction rate of 1%.
     为了比较端壁抽吸对叶片径向二次流的影响,分别对展弦比为2.53和0.3两套叶栅进行端壁抽吸,其中上下端壁的抽吸量均为1%。
短句来源
     Numerical Investigation of Secondary Flows in a Compressor Cascade with Positively leaned Blades
     正倾斜叶片压气机叶栅二次流的数值研究
短句来源
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  二次流动
     Investigations of flow characteristics reveal that unsteady multi-crest velocity profile of the periodical flows and secondary flows of serpentine micro-channel greatly enhance liquid mixing.
     第(4)工况液体混合效率最高。 流动特征分析表明,在矩形截面弯曲微通道流量不为零的周期流动中,弯曲微通道横截面的二次流动和周期流动在通道横截面变化的速度分布可以大大提高液体混合效率。
短句来源
     The secondary flows for dilute gas-solid two-phase flow in a 90° curved duct of quadrate section are investigated numerically with two-fluid model with body-fitted-coordinates.
     应用双流体模型在贴体坐标系下数值计算了90°方形截面弯管内稀疏气固两相的二次流动.
短句来源
     A positive curving of the blades has been found to be conducive to a decrease in the transverse pressure gradient at the end wall and a weakenin g of the end wall secondary flows.
     叶片正弯后有助于减少端壁处的横向压力梯度 ,削弱端壁二次流动 ;
短句来源
     The calculation results of a straight and a positively curved blade flow field show that the positively curved blades can create in the flow passage, especially at the suction side surface, a “C” shaped static pressure distribution. The latter effectively suppresses radial secondary flows.
     计算了直叶片及正弯叶片流场 ,计算结果表明叶片正弯曲在流道内 ,尤其是吸力面表面建立起“C”型静压分布 ,抑制了径向二次流动 ;
短句来源
     Investigation of flow characteristics reveals that unsteady multicrest velocity profile of the periodical flows and secondary flows of serpentine microchannel greatly enhances liquid mixing.
     流动特征分析表明,弯曲微通道横截面的二次流动和周期流动在通道横截面变化的速度分布可以大大提高液体混合效率.
短句来源
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  “secondary flows”译为未确定词的双语例句
     The sufficient mixing of primary and secondary flows in cavity can be reached by means of aiding tab,which is 0.77 cm×0.254 cm.
     光腔内主副气流借助翼片辅助方法实现充分混合,翼片长0.77 cm,宽0.254 cm,满足气流混合要求。
短句来源
     Effect of distance between secondary flows,the jet angle and the total pressure on the status of flow-fields,has been studied.
     同时还研究了HYTEN的流场特征,不同副喷管间距、注入角度和总压对流场参数的影响。
短句来源
     The Circumferencially Bowed Blade (CBB) was proposed in the early 1960's, and is becoming a powerful means to control secondary flows in turbomachinery.
     六十年代提出的静叶片的倾斜或弯曲方法是以透平轴的平行线为转动轴将叶片转动(构成倾斜叶片)或沿叶高弯曲(构成弯曲叶片)。
短句来源
     Since the flow fields inside centrifugal impellers are turbulent with strong eff ect of secondary flows and of complex ge ometry,it is hard to use S1 S2 theory an d invicid viscous iteration method for n umerical analysis,even at the design poi nt.
     应用k-ε紊流模型及非交错网格SIMPLE方法,求解了三维时均N-S方程。
短句来源
     The numerical simulation demonstrate the details of the flow separation, the wake formation and the secondary flows development.
     侧重分析了叶轮内部分离流动和射流尾迹区的形成和特点。
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  secondary flows
Determination of secondary flows in flow past a semi-infinite plate
      
The possible use of the solutions so obtained in order to describe secondary flows with repeated circulation in channels of simple shape (ring, circle, square, rhomb, rectangle, equilateral triangle) is demonstrated.
      
The steady secondary flows (Taylor vortices) of a viscous incompressible fluid between concentric rotating cylinders are studied.
      
Secondary flows develop during the flow of a liquid in curvilinear channels.
      
It is shown that near points of inflection of the profile of the leading edge of a flat wing strong self-induced secondary flows can be formed together with associated local peaks of the heat fluxes and the friction.
      
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Using the motheds of undetermined' boundary value of electrode wall and smooth conjunction with solutions of different regions, the solution of one-dimensional ma-gnetohydrodynamic flow for the homopolar with incomplete electrodes is given. The homopolar with the annular wire electrodes and with complete electrodes are studied as examples. The flow field and induced magnetic field are calculated for some typical parameters, and all results agree with those obtained by finite difference method both...

Using the motheds of undetermined' boundary value of electrode wall and smooth conjunction with solutions of different regions, the solution of one-dimensional ma-gnetohydrodynamic flow for the homopolar with incomplete electrodes is given. The homopolar with the annular wire electrodes and with complete electrodes are studied as examples. The flow field and induced magnetic field are calculated for some typical parameters, and all results agree with those obtained by finite difference method both in magnitude and in distribution of the fields. The typical magnetohy-drodynamic phenomena of the effect of current dispersion and the Hartmann boundary layer are analysed with some emphsis, and the flow behavier in homopolar is disscussed by using above concepts. The results show that, the use of electrode of incomplete structure can increase the flow quantity, modify the Hartmann boundary layer, and control the secondary flow. These effects can be utilized in practical applications.

本文提出了用待定电极壁边值并分区衔接的方法,完整地求解了环管中部分电极单极机的磁流体力学一维流动问题.做为两个特例,研究了环线电极和通常的全电极结构的单极机.对一些典型参数下的流场和感应磁场的分布进行了数值计算.与差分计算的结果比较,在数值和分布两方面都相当符合.着重研究了弥散效应及哈特曼边界层这些磁流体力学的特征现象,并用这些概念去讨论单极机的内部流动现象.结果表明,部分电极结构可以增加环管的流量,改善哈特曼边界层,控制二次流的发展.这些作用对具体的单极机应用有一定实用价值.

The paper shows that the stream-surface theory does not take account of the actions of secondary flow induced by the disturbance blade force. Based on the stream-surface, the generalised equation of such a secondary flow in an axial-turbomachine is deduced. Compressibility of flow is corrected with the local Much number of the primary flow to avoid the errors which are brought out by using only Much number upstream or a given average Much number in the traditional linearlized theory....

The paper shows that the stream-surface theory does not take account of the actions of secondary flow induced by the disturbance blade force. Based on the stream-surface, the generalised equation of such a secondary flow in an axial-turbomachine is deduced. Compressibility of flow is corrected with the local Much number of the primary flow to avoid the errors which are brought out by using only Much number upstream or a given average Much number in the traditional linearlized theory. The existance of the primary flow vorticity reflects in a so-called stream-sheet thickness 6 of the S2 stream surface of the primary flow. The b=1 represents an irrotational primary flow or the case in which the primary flow vortex is negligible small. The b=0 is a limiting case which represents that the vorticity of the primary flow becomes infinite. Then an attempt to approach the secondary flow problem of large shear and large disturbance flow is tested.The paper also shows the equations deduced from generalised equation under the conditions of the compressible axi-symmetric axial-inlet flow and the incompressible 2-D plane cascade flow. Then it shows that the generalised equation is appropriate for correcting the effects of the secondary flow on the stream surface flow after comparing with the equations in the reference [10], [11] and [12] when the assumptions of lifting line theory are adopted.

本文论证了流面理论未能计及由举力场的扰动所诱导的二次流的影响,并以流面为基础,推导了轴流式涡轮机械中此类二次流场所遵循的一般方程式。流场的可压缩性用当地的基本流场M数来校正,避开了通常的线性化理论中用叶排上游M数或某个平均M数所带来的误差。基本流场的旋度影响用基本流场5_2中心流面的流片厚度b来代表。b=1代表了基本流场无旋或旋度影响可忽略的情形,b=0的极限情况代表了基本流场的旋度为无穷大的情况。从而为探索解决大剪切大扰动流场中的二次流问题提供了一种可能的途径。文中分析了一般方程在不可压平面叶栅流动和可压缩轴对称轴向进气流动中所具有的形式,并指出,在举力线理论的假设前提下,它们和文献[10—12]中的基本方程的形式相同,从而证明了本方程的适用性。

When an oil-flow from a primary pump is jetting through the inlet orifice of the throttling block, it is surrounded by the controlling oil-flow being jetted radially from the secondary pump and is subjected to hydrodynamic action by the latter. In this case, the radial oil-flow under the control of the secondary pump acts as a "throttling neck" on the axial primary flow and brings about some changes in characteristics of each outflow from this two-oilflow throttling block....

When an oil-flow from a primary pump is jetting through the inlet orifice of the throttling block, it is surrounded by the controlling oil-flow being jetted radially from the secondary pump and is subjected to hydrodynamic action by the latter. In this case, the radial oil-flow under the control of the secondary pump acts as a "throttling neck" on the axial primary flow and brings about some changes in characteristics of each outflow from this two-oilflow throttling block. The pressure drop between the inlet and outlet of this throttling block is hence one parameter dictated by the hydraulic characteristics of the secondary flow. Based on this principle, the author has made analyses on the controlling mechanism of the two-pump constant-flow valves, formulated relevant equations for calculation and made comparisons for the parameters calculated from various machines, either home-made or from abroad. The results obtaind are quite in conformity with the actual machine-performance.

当主泵的液流从节流元件的进油节流孔喷流,其流束被辅助泵的径向控制液流所包围并处于其液动力作用下时,径向辅助泵控制液流就对主泵液流起着“节流液颈”的作用,使两路液流从节流元件出流的特性发生变化,节流元件进出口的压力降,成了受辅助液流流动特性所控制的参数。作者基于这种理论,对双泵稳流阀的调节机能作了分析,提出有关计算公式,并进行国内外实机参数的对比计算,计算结果与实机情况吻合。

 
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