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收缩喷嘴     
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  convergent nozzle
     To investigate the noise characteristics of the impinging jet from a small nozzle, measurement of far field sound pressure level was performed for the aerodynamic noise generated by subsonic and supersonic jet from a 3mm-diameter axisymmetric convergent nozzle normally or obliquely impacting on a large rigid flat plate.
     为研究小口径喷嘴冲击射流的噪声特性 ,测量了 3 mm口径的轴对称收缩喷嘴在各种压比情况下产生的亚音速和超音速射流冲击坚固大平板产生的噪声 . 发现噪声在空间呈近似四瓣分布 ,当喷嘴与平板距离减小时 ,噪声指向壁射流下游的瓣得到增强 ,反之 ,噪声指向喷嘴上游的瓣得到增强 .
短句来源
     The characteristics of the far-field noise of impinging jet with 3-millimeter diameter axisymmetric convergent nozzle under the condition of variable nozzle-to-plate distance,and their methanism were investigated experimentally.
     测量了 3毫米口径轴对称收缩喷嘴射流冲击大平板产生的噪声随冲击距离变化的特性。
短句来源
     The noise directivity pattern of the impinging jet from a 3 millimeters diameter axisymmetric convergent nozzle normally and obliquely impacting the large rigid flat plate was studied experimentally with different pressure rates and different nozzle-to-plate distances.
     实验研究了 3毫米口径轴对称收缩喷嘴在各种压比下射流垂直冲击和倾斜冲击坚固大平板产生的噪声的指向特性。
短句来源
     Noise Directivity of Impinging Jet From a Small Diameter Axis Ymmetric Convergent Nozzle on Large Flat Plate
     小口径轴对称收缩喷嘴射流冲击大平板噪声指向特性研究
短句来源
     Noise Characterastics of the Impinging Jet from a Small Diameter Axisymmetric Convergent Nozzle Acting to a Large Flat Plate
     小口径轴对称收缩喷嘴射流冲击大平板噪声特性的实验研究
短句来源
更多       
  “收缩喷嘴”译为未确定词的双语例句
     Effect of Nozzle Exit Shape on Aerodynamic Characteristic of Free Jet
     收缩喷嘴内部流道型线对射流流场的影响
短句来源
     Experiments prove that under same working conditions, "super water" jet rock erosion volume is two times of the pure water jet and the distance from nozzle of the most efficiency rock failure (rock failure volume peak value) is longer than pure water jet.
     采用带喷嘴套的锥型收缩喷嘴 ,利用“超水” (高聚物添加剂 )射流冲蚀砂岩的实验结果表明 ,其它条件相同时 ,“超水”射流破岩体积是清水射流的 2倍左右 ,并且破岩效率最大 (破岩体积峰值 )的射流喷距比清水射流的大。
短句来源
     This paper presents the distinguish and features for low speed flow scheme and high speed flow scheme of shrink nozzle, providing the formulation of calculating flow characteristic parameters for low speed blowing.
     本文介绍了收缩喷嘴的低速吹气与高速吹气流动图案的区别及其特点。 给出了计算低速吹气的流动特性参数的计算公式。
短句来源
  相似匹配句对
     Theoretical Calculation on the Behavior of Gas-Powder Flow Passing through Convergent Nozzle
     收缩喷嘴中气粉流行为的理论计算
短句来源
     Theoretical Study on the Gas-Particle Flow Passing through Convergent-Divergent Nozzle
     在收缩-扩张喷嘴中气粉流的理论研究
短句来源
     Shrink packaging
     收缩包装
短句来源
     Analysis on shrinkage cracks of concrete
     混凝土收缩裂缝分析
短句来源
     sprayer temperature-40 ℃;
     喷嘴温度:40℃;
短句来源
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  contraction nozzle
The combustor comprised a swirl driven primary zone, annulus fed primary and dilution jets and an exit contraction nozzle.
      
Velocity measurements were made in two jet flows, the first exiting from a smooth contraction nozzle and the second from a long pipe with a fully developed pipe flow profile.
      
The behavior of a non-buoyant circular water jet discharged from a contraction nozzle was experimentally investigated.
      
It is assumed that this probably resulted from the use of the contraction nozzle.
      
To reduce flow disturbances upstream, a flow straightener and a contraction nozzle were placed in the inflow chamber.
      
更多          
  converging nozzle
The axisymmetric nozzle geometry investigated was a converging nozzle with straight part.
      
The processes of shock reflection from an endwall with a converging nozzle and of underexpanded free jet formation were examined.
      
The configurations used are a set of sharp-edged slit orifices, a smooth converging nozzle and a tube.
      
This method visualized both underexpanded sonic gas jets from a converging nozzle (SN-Type) and overexpanded supersonic gas jets from a converging-diverging nozzle (CD-Type).
      
The jets issued from a two-dimensional slit connected to a converging nozzle, opening normally from a flat wall.
      
更多          
  convergent nozzle
The results of an experimental investigation of the effect of flow contraction in the convergent nozzle of a subsonic wind tunnel on the level of turbulence are reported.
      
Determination of specific thrust in unchoked regimes and design of a separationless convergent nozzle contour
      
In the presence of viscosity forces local boundary layer separation may occur in the neighborhood of the entrance section of the convergent nozzle.
      
A method of constructing a separationless convergent nozzle contour with enhanced thrust is developed on the basis of a boundary layer separation criterion.
      
Flow-rate and thrust coefficients for two-layer flows in a convergent nozzle
      
更多          
  contracting nozzle
In a contracting nozzle, "blocking" also occurs if the channel is sufficiently long.
      
A study is made of the influence of the nonuniformity of the parameters due to the two-dimensional nature of the flow on the specific thrust of a contracting nozzle.
      
In this paper a calculation procedure for simulating the combustion flow in the afterburner with the heat shield, flame stabilizer and the contracting nozzle is described and evaluated by comparison with experimental data.
      
The results of an experimental investigation into the effect of the cone angle and the degree of contraction of a contracting nozzle on the geometrical structure of the first roll of an underexpanded jet are presented.
      


New acoustic wave genelating device for parrmn inhibition and oil viscosity reducing is comprised of upper and lowersubs, vibrating spring and convergent nozzle. The device is installed between the oil well pump and liner. The downholefluid is jetted from the nozzle at fairly high speed Under differential Pressure, lashing at the vibrating spring and generat-ing mechanical vihrating acoustic wave. the viscosity of the oil tvater mixture in the tubing is reduced and the paamncrystal is hard to gather and grow...

New acoustic wave genelating device for parrmn inhibition and oil viscosity reducing is comprised of upper and lowersubs, vibrating spring and convergent nozzle. The device is installed between the oil well pump and liner. The downholefluid is jetted from the nozzle at fairly high speed Under differential Pressure, lashing at the vibrating spring and generat-ing mechanical vihrating acoustic wave. the viscosity of the oil tvater mixture in the tubing is reduced and the paamncrystal is hard to gather and grow owing to the acoustic wave mechanical effect and diffusion and emulsification of mixturein the acoustic wave, thereby the purpose of viscosity reducing and paluffin control can be achieved. Lab test and site ap-plication shows that this device is characterized by simple structure, low cost and convenient operation, and is effective incrude oil viscosity reducing and paraffin inhibition.

新型声波降粘防措装置由上、下接头、振动簧片和收缩喷嘴构成。装置安装在抽油泵泵简之下,尾管之上,在压差作用下井下流体以较大速度从装置的喷嘴射出,冲击振动簧片,产生机械振动声波,油水混合液在声波中产生相应的声波力学效应和分散乳化作用等,使混合液在油管内的粘度降低,蜡晶不易聚集长大,从而达到降粘防蜡延长油井热洗周期的目的。室内试验及现场近20口井的应用情况表明,这种装置具有结构简单、成本低廉、应用方便等特点,具有明显的降粘防蜡效果。

Results of a numerical study of the effect of nozzle exit shape on round turbulent free jet are presented Three nozzle types with the same exit area were used:two sharp_edged nozzles and a smoothly contoured nozzle Two flow configurations:a subsonic jet case and a supersonic jet case are computed using different turbulent model (RNG k_ε model and S_A model) The result indicates that the nozzle interior shape has important effect on aerodynamic characteristic of free jet Using second_order_accurate finite_volume...

Results of a numerical study of the effect of nozzle exit shape on round turbulent free jet are presented Three nozzle types with the same exit area were used:two sharp_edged nozzles and a smoothly contoured nozzle Two flow configurations:a subsonic jet case and a supersonic jet case are computed using different turbulent model (RNG k_ε model and S_A model) The result indicates that the nozzle interior shape has important effect on aerodynamic characteristic of free jet Using second_order_accurate finite_volume schemes,sufficiently fine unstructured grid and non_reflecting boundary condition ensures numerical credibility of the solutions The results demonstrate favorable agreement with experimental data

为研究收缩喷嘴内部流道形成对射流流场的气体动特性参数的影响 ,根据可压缩流体轴对称N—S方程 ,采用非结构网格和二阶精度的有限体积法 ,对不同内部流道形线的喷嘴自由射流进行数值模拟。亚声速射流采用RNGk_ε湍流模型 ,超声速射流采用S—A湍流模型 ,计算结果与实验较吻合。在亚声速流动中 ,收缩喷嘴的收缩角大小会影响其对射流的阻滞效果 ,内部流道形线设计为维多辛斯基曲线可以获得更好的流场动特性参数 ,有利于提高喷嘴的工作效率。在超声速流动中 ,喷嘴流道型线对出口膨胀波的角度与强弱影响较大 ,要根据射流的有效作用区域选择合适的喷嘴 ,才能使能量的损失最小。若要获得较佳的外部流场参数 ,优化喷嘴内部流道设计十分重要

A computational study for axisymmetric jet flow with Spalart Allmaras turbulence model was carried out.The second order finite volume method,fine unstructured grids and non reflecting boundary condition were used in solving the compressible N S equations.The numerical results are in good agreement with experimental data.It is demonstrated that the Spalart Allmaras turbulence model is suitable for numerical simulation of the axisymmetric jet flow and the sufficiently fine unstructured grids are helpful in...

A computational study for axisymmetric jet flow with Spalart Allmaras turbulence model was carried out.The second order finite volume method,fine unstructured grids and non reflecting boundary condition were used in solving the compressible N S equations.The numerical results are in good agreement with experimental data.It is demonstrated that the Spalart Allmaras turbulence model is suitable for numerical simulation of the axisymmetric jet flow and the sufficiently fine unstructured grids are helpful in obtaining the flow field details.In addition,it is found that,for under expanded jet flow,computation should be started from the internal upstream of the nozzle exit and its exit boundary conditioned should not be prescribed as sonic profile in this case.It is useful in understanding nozzle internal and external flow field and impinging jet parameter distribution.It is also helpful for optimal design of nozzle internal structure.

为探索轴对称射流准确的数值模拟方法 ,根据可压缩的轴对称N S方程 ,利用二阶精度的有限体积法对轴对称的自由射流和垂直冲击射流进行数值模拟。结果表明采用Spalart Allmaras湍流模型 ,可很好描述射流流动。收缩喷嘴射流计算应从出口上游的内流开始 ,而不能在出口截面上给定声速条件。计算结果与实验吻合较好 ,所获得的喷嘴内外部流场的流动状况以及冲击射流参数分布 ,可用于优化喷嘴内部结构设计。

 
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