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Improved design method of gradation band curves for granular filters 改进的颗粒滤波器级配带曲线设计方法
Q3 Engineering Pub Date : 2021-01-01 DOI: 10.11660/SLFDXB.20210408
Gang Zhang, Hongyu Wang, Israr Jahanzaib
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引用次数: 1
New system for rapid measurement of indoor surface velocity fields based on feature matching velocimetry 基于特征匹配测速的室内表面速度场快速测量新系统
Q3 Engineering Pub Date : 2019-11-25 DOI: 10.11660/SLFDXB.20191101
Liekai Cao, M. Detert, Danxun Li
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引用次数: 5
Experimental Study on Fracture Parameter of Three-Point Bending Beam Based on Smart Properties of CFRC 基于CFRC智能特性的三点弯曲梁断裂参数试验研究
Q3 Engineering Pub Date : 2008-09-04 DOI: 10.1061/40988(323)43
Dian-jun Zhang, Shi-lang Xu
According to actuality that softening process has no stable model and mode Ⅰ fracture has been investigated rarely,the smart properties of CFRC are utilized to attain the initial load of three-point bending beam.Double-K criterion is used to compute K~(ini)_(IC) and K~(un)_(IC),which can explain the toughening effect of fiber effectually.The smart properties of CFRC can be used to research mode Ⅰ fracture of three-point bending beam after analysis of the relationships between relative variation of resistance and load,deflection and CMOD which accord with Lorentz fit.The curves of relative variation of resistance before maximum load can illustrate three stages of elastic deformation,stable fracture and unstable fracture.
针对软化过程无稳定模型和Ⅰ断裂模式研究较少的现状,利用CFRC的智能特性实现三点弯曲梁的初始载荷。采用双K判据计算K~(ini)_(IC)和K~(un)_(IC),可以有效地解释纤维的增韧效果。分析了CFRC的阻力与荷载的相对变化、挠度和CMOD之间的关系,符合洛伦兹拟合,可将CFRC的智能特性用于三点弯曲梁的Ⅰ断裂模式研究。最大荷载前的阻力相对变化曲线可以说明弹性变形、稳定断裂和不稳定断裂三个阶段。
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引用次数: 7
Influence of gas nucleus on scale effect of cavitation 气核对空化尺度效应的影响
Q3 Engineering Pub Date : 2005-01-01 DOI: 10.1201/b16814-292
Wu Jianqiang
For the scale effect of cavitation test,the influence of gas nucleus on scale effect is analyzed in this paper.The effects of density,distribution and initial radius of gas nucleus on scale effect are analyzed respectively and the measures necessary for reduction of resulting scale effect are attained.At the same time,critical pressure is applied to replace the cavitation number defined by vaporization pressure and the relationship between initial dimension of gas nucleus and tensile strength of liquid is established to endeavor for eliminating the effects of tensile strength of liquid on scale effect.In order to eliminate scale effects of cavitation,some problems required to be paid attention to cavitation test are summarized to provide the references for actual test and prepared in further quest of complete and accurate simulation methods.
针对空化试验的尺度效应,分析了气核对尺度效应的影响。分别分析了气核密度、分布和初始半径对结垢效应的影响,得出了减小结垢效应的必要措施。同时,用临界压力代替汽化压力定义的空化数,建立气核初始尺寸与液体抗拉强度的关系,力求消除液体抗拉强度对水垢效应的影响。为消除空化的尺度效应,总结了空化试验中需要注意的一些问题,为实际试验提供参考,为进一步寻求完整、准确的模拟方法做准备。
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引用次数: 1
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水力发电学报
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