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冲击中心
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  impact center
     The numerical results show if no pore-fluid coupling is considered,the maximum principal stress will be located at the impact surface and the radial distance from the impact center is directly proportional to the corresponding standoff distance,meanwhile the maximum shear stress occurs about half of the nozzle diameter downward the impact center.
     结果表明,在射流冲击作用下,如不考虑孔隙流体耦合作用,最大拉应力位于冲击面,离冲击中心径向距离与喷距成正比,最大剪切应力位于岩石冲击中心下部约0.5倍喷嘴直径位置;
短句来源
     On the other hand,when water jets impinge on the saturated rocks in which fluid flows according to the Darcy's law,the maximum principal stress occurs about 0.4 time of the nozzle diameter downward the impact center.
     如考虑孔隙流体耦合作用,最大拉应力位于岩石冲击中心下部约0.4倍喷嘴直径位置。
短句来源
     A pendulum is a key part of impact testing machines. Its characteristic parameters such as impact energy,length of pendulum,mass center and impact center play an important role in the performance of impact testing machines.
     摆锤是冲击试验机中的关键部件,其特征参数能量、摆长及质心、冲击中心对冲击试验机的使用性能起重要的作用。
短句来源
  “冲击中心”译为未确定词的双语例句
     A DYNAMIC FRACTURE ANALYSIS OF CENTER-CRACKED BRAZILIAN DISC SPECIMENS UNDER MIXED MODE DIAMETRIC IMPACT LOADING
     径向冲击中心直裂纹巴西圆盘的复合型动态断裂分析
短句来源
     After changing the position of entering gas, two section airflow enter from cone wall. The airflow strike center export gas pipe and form four section revolve airflow, when they barge up against the opposite airflows, form new airflows.
     改变进气口位置后,两股气流从锥体壁进入,在气流下降过程中首先冲击中心气流导出管,并绕中心管形成形成四股旋流,当相向运动的绕中心管的两股旋流相遇后,又形成向除尘器内壁的旋流,绕经除尘器下锥体后从中心气体导出管排出。
短句来源
  相似匹配句对
     Where T(R) is the hypercenter of R; Z(R) is the center of R.
     Z(R)是R的中心
短句来源
     Research on Integrated Control System of the Notched Impact Specimen Machine Tool
     冲击试样加工中心集成控制系统的研究
短句来源
     Mincom Central
     明科中心
短句来源
     The Shock of Photograph
     影像的冲击
短句来源
     Culture Shock
     文化冲击
短句来源
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  impact center
Major disturbances of strata by the impact therefore appear to have been confined to within less than 60?km from the proposed impact center.
      


Supersonic impinging jet was predicted by axisymmetric compressible Navier Stokes equations. A finite volume method with unstructured meshes and S A turbulence model were employed in the calculation. The computation was processed for under expanded supersonic impinging jet under pressure ratio 3 and 4 separately. The wave patterns were shown. The numerical results are in good agreement with experimental data. For higher pressure ratio, the pressure of the impinging region on the plate is lower and keep the...

Supersonic impinging jet was predicted by axisymmetric compressible Navier Stokes equations. A finite volume method with unstructured meshes and S A turbulence model were employed in the calculation. The computation was processed for under expanded supersonic impinging jet under pressure ratio 3 and 4 separately. The wave patterns were shown. The numerical results are in good agreement with experimental data. For higher pressure ratio, the pressure of the impinging region on the plate is lower and keep the same nearly along the radius direction. The position of the maxim pressure shifts from the impinging point. The reverse secondary flow occurs near the solid boundary.

利用有限体积法对轴对称可压缩的N S方程进行离散 ,对喷嘴的超声速垂直冲击射流进行了数值模拟。网格的划分采用非结构性网格 ,湍流模型为S A湍流模型 ,在近壁处采用壁面函数进行修正。分别计算压比为3和 4的超声速欠膨胀垂直冲击射流 ,得到详细的波系结构 ,激波形状和位置与实验相吻合。大压比下 ,壁面上冲击中心区域压力相对低 ,分布较平坦 ,压力最大点所在位置偏离中心冲击点 ,并且在近壁处有回流

The stress distribution in the media under high pressure water jet-flow remains unknown and this restricts the application and development of the water jetting technology. A numerical analyzing model of stress distribution about interaction of super high water jets impinging no porous elastic solid is established according to fluid-structure interaction theory. Standard K-epsilon dual-equation model and controlled volume method for the water jets, and elastic orthotropic continuum and finite element method for...

The stress distribution in the media under high pressure water jet-flow remains unknown and this restricts the application and development of the water jetting technology. A numerical analyzing model of stress distribution about interaction of super high water jets impinging no porous elastic solid is established according to fluid-structure interaction theory. Standard K-epsilon dual-equation model and controlled volume method for the water jets, and elastic orthotropic continuum and finite element method for the solid are adopted. Also, the numerical method for both material interactions is given. The stress distributions in the fluid field and the media with different water jetting velocity are computed using the model and method. Numerical results show that the stress distributes obviously on the part solid under water jets impingement. The impinging area is subjected to compression stress, and the maximum tensile stress is located on impacting surface and the maximum shear stress being under impacting center about half nozzle diameter away. It concludes that by controlling the jet velocity and distance, jet cutting, breaking, washing, surface processing efficiencies could be improved.

由于高压水射流破岩涉及的因素较多 ,且水射流作用过程复杂 ,致使水射流冲击下介质内部的应力分布一直未能被准确揭示 ,从而制约着水射流技术的应用和发展。运用全解耦的流固耦合理论 ,建立了超高压水射流冲击弹性非孔隙介质的应力分布计算的数值模型 ,其中水射流采用标准K -ε双方程模型和控制体积法 ,介质采用固体有限元法 ,给出了水射流与介质耦合的数值算法。根据建立的理论模型 ,计算了介质在不同水射流速度冲击下流场压力和介质内部的应力分布规律。计算结果表明 ,在超高压水射流冲击作用下 ,固体介质受力局部效应明显 ,冲击区内介质基本处于受压状态 ,最大拉应力值位于介质表面 ,最大剪切应力位于冲击中心下部约 0 .5倍喷嘴直径的位置。控制好水射流喷射速度与喷距 ,可以提高水射流清洗、切割、破碎和表面处理效率。

Based on the uncoupled fluid-structure interaction theory,a numerical model has been proposed to study the fracture mechanism of rocks under water jet impact. The jet flow characteristics and the stress distributions in the system are calculated with and without taking account of the pore-fluid coupling.The numerical results show if no pore-fluid coupling is considered,the maximum principal stress will be located at the impact surface and the radial distance from the impact center is directly proportional to...

Based on the uncoupled fluid-structure interaction theory,a numerical model has been proposed to study the fracture mechanism of rocks under water jet impact. The jet flow characteristics and the stress distributions in the system are calculated with and without taking account of the pore-fluid coupling.The numerical results show if no pore-fluid coupling is considered,the maximum principal stress will be located at the impact surface and the radial distance from the impact center is directly proportional to the corresponding standoff distance,meanwhile the maximum shear stress occurs about half of the nozzle diameter downward the impact center.On the other hand,when water jets impinge on the saturated rocks in which fluid flows according to the Darcy's law,the maximum principal stress occurs about 0.4 time of the nozzle diameter downward the impact center. The results can provided some ideas in considering the rock damage criterion for rock failure mechanism study under water jet impact.

运用全解耦流固耦合理论,建立了水射流冲击岩石介质流固耦合数值分析模型,给出了数值算法,计算分析了考虑和不考虑孔隙流体耦合效应对射流冲击岩石时应力分布的影响规律。结果表明,在射流冲击作用下,如不考虑孔隙流体耦合作用,最大拉应力位于冲击面,离冲击中心径向距离与喷距成正比,最大剪切应力位于岩石冲击中心下部约0.5倍喷嘴直径位置;如考虑孔隙流体耦合作用,最大拉应力位于岩石冲击中心下部约0.4倍喷嘴直径位置。数值分析结果可为水射流破岩机理研究中岩石破坏准则的选择提供依据。

 
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