EXTENDED SELF SIMILARITY OF PASSIVE SCALAR IN RAYLEIGH-BNARD CONVECTION FLOW BASED ON WAVELET TRANSFORM

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Extended Self Similarity of Passive Scalar in Rayleigh-Bénard Convection Flow Based on Wavelet Transform

Wavetet transform was used to analyze the scaling law of temperature data utilize the method of extended self similarity, presented first by Benzi et al. , to study the scaling exponent of temperature data. The obtained results show that the inertial range is much wider than that one determined directly from the conventional structure function, and find the obtained scaling exponent agrees well with the one obtained from the temperature data in an experiment of wind tunnel. The second one was that, by extending the formula which was proposed by A. Arneodo et al. for extracting the scaling exponentζ(q) of velocity data to temperature data, a newly defined formula which is also based on wavelet transform, and can determine the scaling exponentζ(q) of temperature data was proposed.The obtained results demonstrate that by using the method which is named as WTMM ( wavelet transform maximum modulus )ζ(q) correctly can be extracted.  

煤矿泥岩流变模型辨识及支护方法的确定

 结合高家梁煤矿斜井泥岩的流变变形特征, 对泥岩进行分析建模, 设计有效的泥岩斜井支护措施. 通过对泥岩进行蠕变加卸载试验, 采用统一流变力学模型理论建立了能表现泥岩流变特性的弹性--黏性--黏弹性--黏弹塑性模型, 并确定了流变模型参数. 结合泥岩试验测得的泥岩力学特性和现场观测资料, 设计采用锚喷网联合支护方法, 并采用大型有限元软件ADINA进行数值模拟分析, 该支护方法能有效控制泥岩变形, 采用的锚喷网支护方法合理可靠.  

湍流最高激发态的局部结构及其绝对标度律

通过对湍流层次结构模型中提出的最高激发态的进一步研究发现,最高激发态存在绝对标度律,且该绝对标度律是由信号中最强耗散涨落的局部结构产生的,并由此推测出局部强间歇结构一般具有绝对标度的结论.