Numerical Clarification of Wavy Sand Erosion Phenomena generated by Interaction among Flow, Small Particle and Wall Surface

流、小颗粒与壁面相互作用产生的波状砂蚀现象的数值解释

• 批准号: 16560158
• 负责人: YAMAMOTO Makoto
• 金额: $ 1.98万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560158/
• 关键词: Fluid Engineering; Computational Fluid Dynamics; Sand Erosion; Multi-Physics; マルチフィジックス現象; 流体・粒子・壁面干渉; 90度ベンド; 数値シミュレーション

Sand erosion is a phenomenon where solid particles impinging to a wall cause serious mechanical damages to the wall surface. This phenomenon is a typical multi-physics problem where the flow field, particle trajectory and wall deformation interact with among others. It is well known that the performance and lifetime of various machines are severely degraded due to sand erosion. We have developed the numerical procedure for sand erosion phenomenon. To simulate the phenomenon, the turbulent flow, the particle trajectory and the amount of erosion on the eroded wall were calculated repeatedly. The Neilson-Gilchrist model was used to estimate the weight loss due to sand erosion.In 2004, we extended this code to a three-dimensional computation, and it was applied to the 90-degree bend. The main objective was to clarify the reason why the wavy erosion pattern is formed over the curved wall. 9 cases with different particle diameters and wall curvatures were computed. The materials for the wall … More and the particle were adopted as aluminum and silicon carbide, respectively. It was found that (1)once a particle hits against a wall, an erosion cavity is generates on the wal,. (2)the erosion cavity mainly grows in the streamwise direction, (3)the spanwise growth of the erosion cavity is dominated by the longitudinal vertical motion over the curved wall, and (4)the above described phenomena produces the wavy erosion pattern over the curved wall.In 2005, I tried to clarify the mechanism of wavy sand erosion in a compressor blade passages. First, the code was extended to the rotational frame of reference. About 3 million grid points were used in all computations. It was confirmed that (A)sand erosion severely occurs around the leading edge and the tip of the rotor pressure side, (B)erosion does not appear remarkably in the stator because of the less kinetic energy, (C)in the rotor passage the centrifugal force makes the particles go toward the tip, and (D)particles are accelerated in the stator and thus sand erosion would take place again in the downstream stages. However, since wavy erosion pattern has not clearly reproduced, further investigations will be needed. Less

沙粒冲刷是固体颗粒撞击墙体，对墙体表面造成严重的机械破坏的现象。这种现象是一个典型的多物理问题，流场、颗粒轨迹和壁面变形等因素相互作用。众所周知，由于沙粒侵蚀，各种机械的性能和寿命都会严重下降。我们开发了沙蚀现象的数值计算程序。为了模拟这一现象，反复计算了冲蚀壁面上的湍流、颗粒运动轨迹和侵蚀量。在2004年，我们将Neilson-Gilchrist模型扩展到三维计算，并将其应用于90度弯道。主要目的是为了弄清弧形墙上形成波状侵蚀图案的原因。对9例不同颗粒直径、不同壁曲率的病例进行了计算。墙体…的材料More和颗粒分别被用作铝和碳化硅。研究发现：(1)颗粒一旦碰壁，在墙体上会产生侵蚀空穴。(2)冲蚀空穴主要沿流向生长，(3)冲蚀空穴的横向扩展主要受弯壁上的纵向垂直运动控制，(4)上述现象导致了弯壁上的波浪型冲蚀形态。首先，将该编码推广到旋转坐标系。在所有计算中使用了大约300万个网格点。结果表明：(A)转子压力侧前缘和叶尖附近冲蚀严重，(B)动能较低，定子冲刷不明显，(C)在转子通道中，离心力使颗粒向叶尖方向移动，(D)定子内颗粒加速，下游将再次发生冲刷。然而，由于波浪侵蚀模式没有明显再现，还需要进一步的研究。较少

项目成果

Numerical Investigation on Wavy Streak Formation due to Sand Erosion

沙蚀引起的波状条纹形成的数值研究

• 发表时间: 2005
• 期刊: Proc. 10^th Symposium of Gas Particle Flows
• 作者: M.Suzuki;K.Toda;M.Yamamoto
• 通讯作者: M.Yamamoto

Multi-Physics Simulation of Sand-Erosion Phenomenea on Turbine Blade

涡轮叶片沙蚀现象的多物理场模拟

• 发表时间: 2005
• 期刊: Computational Fluid and Solid Mechanics 2005
• 作者: M.Suzuki;K.Toda;M.Yamamoto
• 通讯作者: M.Yamamoto

Modelling of Three-Phase Flow in Electro-Chemical Machining

电化学加工中的三相流建模

• 发表时间: 2005
• 期刊: Proc. Cavitation and Multiphase Flow Forum
• 作者: R.Tsuboi;K.Toda;M.Yamamoto;R.Nohara;D.Kato
• 通讯作者: D.Kato

Numerical Simulation of Hydrocarbon Fuels PDEs by a Detailed Reaction Model

通过详细反应模型对碳氢燃料偏微分方程进行数值模拟

• 发表时间: 2005
• 期刊: Proc.19^<th> Symposium on Computational Fluid Dynamics B1-4
• 作者: J.Kato;K.Inaba;M.Yamamoto
• 通讯作者: M.Yamamoto

Numerical Simulation of Ice Accretion on Wind Turbine Blade

风力发电机叶片积冰的数值模拟

• 发表时间: 2004
• 期刊: Proc.6^<th> World Congress on Computational Mechanics
• 作者: Y.Imamura;K.Toda;M.Yamamoto
• 通讯作者: M.Yamamoto