【作者】 马辉；

【导师】 安连锁； 姜根山；

【作者基本信息】 华北电力大学（河北） ， 流体机械及工程， 2008， 硕士

【摘要】 声学法检测电站锅炉泄漏技术由于其机理的优势,具有灵敏度高、可以迅速得到检测结果及理论上能够确定泄漏口的大小及位置等优点,是一种先进的技术方法。但声波检测锅炉泄漏过程中,炉内管阵列结构等因素将改变泄漏声波的传播特性,对检测结果有一定的影响。本文研究声波在管阵列中的传播特性,首先以电站锅炉内的管阵列为背景,搭建实验平台,将钢管以三角形周期结构排列于空气中,实验研究声波经管阵列传播后的带隙规律,得到声子带隙随管阵列结构参数改变的变化规律;然后利用平面波展开法求解得到正三角形周期结构的声波禁带,与实验结果进行对比验证,两者具有很好的吻合性。更多还原

【Abstract】 Acoustic detection method for power plant boiler tubes leakage is considered as an advanced technology, which is high sensitivity and get the monitoring result quickly, and it can determine the position and size of the leakage. The acoustic wave propagation is changed by the boiler tubes which may be change the monitoring result when the leakage is occur in the boiler. In this paper, the acoustic propagation in tube rows is studied. First, the tube rows experimental platform is built according to the boiler tubes. The steel pipes are triangular periodic array in the air. The laws of acoustic band-gaps of acoustic wave through the tube rows is studied by experiment, the laws are obtained by change the structural parameters of the steel tubes. Then the acoustic band-gaps of regular triangle are calculated by the plane-wave expansion method, the result is compared with the experimental data, they have a good consistent.更多还原