锅炉换热器管道泄漏口声辐射指向性特征数值研究
姜根山1 安连锁1 杨 昆2
1 华北电力大学 保定 071003 2 华北电力大学 北京 100085
NUMERICAL STUDY OF DIRECTIONALITY PATTERNS FOR ACOUSTIC RADIATION FROM A LEAK SOURCE ON A HEAT-EXCHANGER CYLINDER IN BOILERS
JIANG Gen-shan1, AN Lian-suo1, YANG Kun2
1. North China Electric Power University, Baoding 071003, China;
2. North China Electric Power Unirevsity, Beijing 100085 China
ABSTRACT: In this paper, the sound directionality patternsproduced by a leak source located on a rigid cylinder of infinitelength have been investigated for the case in which the sourcestrength may be represented as a separable function of azimuthangle and axial dimension. It is observed that the patterns ofamplitude and phase in the whole far-field space of the leak aredependent of the frequencies of sound waves, circumference ofthe cylinder, and the strength of the leak source. The results present that the observation points and the frequencies are important to the techniques of the leak trace. It is very usefuland can be applied to the technique of acoustic leak detection.
KEY WORDS: boiler heat-exchanger; tube leak detection; acoustic radiation; directionality
摘要 该文从理论上研究了锅炉换热器管道泄漏口声辐射的频谱规律及指向性特征，将泄漏口视作轴向坐标和方位角的可分离辐射源，计算了矩形泄漏源在不同频率下辐射声压级及位相在远场的分布规律，指出了声场空间分布与声波频率，管道直径以及泄漏源强度及大小的关系，讨论了检测点布放位置及频率选择对被动式管道泄漏检测定位技术的影响，为锅炉换热器管道的泄漏检测及定位技术提供了理论依据。
关键词 锅炉换热器 管道泄漏检测 声发射 指向性
中图分类号 TK223 文献标识码 A
