【摘要】 利用小波变换对不规则指流湿润锋随宽度的多尺度变化及周期进行了探讨,通过小波变换得到小波系数的等值线图。结果表明,各尺度的强弱分布情况以及湿润锋的突变点和变化趋势,并通过小波方差确定其主周期。以下层砂的中值粒径为2.5 mm时的湿润锋波动变化为例,分析了不同尺度下的强弱和分布,并得到在此条件下每隔9.25 cm会出现一个指流现象。更多还原

【Abstract】 Using wavelet transform to discuss the wet front of the irregular finger flow with the width of multiscale change and cycle,through the wavelet transform we got contour map of wavelet coefficients.The results showed that the strength of each scale distribution and mutations and changed in trends of wetting front.And through the small functions the primary cycle was determined.Getting the fluctuation change of wet front when the median diameter of following layer sand is 2.5 mm,as this situation an example,we analyzed the strength distribution under different scales,and obtained that in every 9.25 cm appeared a front flow under this condition.更多还原