管道裂纹泄漏率预测是破前漏技术的应用基础,窄缝裂纹流道的流动特性将直接影响泄漏率计算结果。本研究采用数值计算方法,对窄缝裂纹通道进行参数化建模,通过计算流体力学技术(CFD)研究裂纹几何形貌参数对流动特性的影响。研究结果表明,宏观粗糙度与裂纹张开位移(COD)的比值会影响裂纹通道流场和湍流特性,使得相同雷诺数下的阻力系数随上述比值的增加先增加后减小。
The leak rate predication of the pipe crack is the foundation of the leak-before-break (LBB) technology application. The fluid flow characteristics are crucial for the calculation process of the leak rate predication. The narrow crack flow channel is modeled and parameterized by the numerical calculation technique. And the effect of the crack-morphology parameters on the fluid flow characteristics is studied by the computational fluid dynamics (CFD) analysis. The research results show the flow field and the turbulence kinetic energy distribution is relation to the ratio of the global roughness and the crack opening distance (COD). Furthermore, the friction coefficient will increase firstly and then decreased with the increase of the ratio under same Reynolds number.
2018,40(8): 110-113 收稿日期:2017-11-15
DOI:10.3404/j.issn.1672-7649.2018.08.021
分类号:TL334
作者简介:张德奎(1978-),男,工程师,主要从事核动力装置研究工作
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