声波除灰的管阵列声场数值模拟研究

STUDY ON NUMERICAL SIMULATION OF SOUND FIELD ON TUBES ARRAY FOR SONIC SOOT CLEANING

基于边界元法,利用ANSYS软件建立了电站锅炉低温过热器管阵列的三维整体模型,在声学分析软件SYSNOISE中模拟计算了声波除灰时模型空间内以及管壁表面声场的分布特性。分析得出:模型空间内各处声压级的分布变化梯度很大;由于后墙对声波的反射作用,末排管周围声场的声波能量高于声源辐射的功率。通过计算场点声压级和计算结果的提取命令可确定除灰死角的具体位置,以进行补吹。

Based on the theory of boundary element method, a two - dimentional whole model of low - temperature superheater tubes＇ array for utility boiler has been established by using ANSYS software. In acoustic analysis software SYSNOISE,the sound field distribution characters in the space of model and on the tubes＇ surface during the time of sonic soot cleaning have been simulated and calculated. The results obtained from analysis are as follows： there is a great gradient of variation in sound pressure distribution at everywhere in the space of model;the sound wave energy in sound field around the final row of tubes is greater than the power radiated from the sound source due to reflecting effect of the rear wall to the sound wave. Through calculation of the sound pressure at points in the sound field, and extracting command from the results of calculation, the concrete location of dead corner for soot cleaning can be determined,and reblowing of soot may be carried out.