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针对电站锅炉炉管泄漏点精确定位问题,对泄漏喷流形成的流场和声场进行了数值模拟.将通信工程中的Chan算法引入到炉管泄漏定位检测中,分别在空旷环境、实验室环境、模拟炉膛常温无噪声环境和模拟炉膛常温高噪声环境下进行了实验研究.结果表明:泄漏喷流流场轴向速度是引起泄漏声波传播扰动的主要原因,远场的噪声辐射具有指向性特征;在孔口部区域声功率级最大,且声功率级沿对称轴方向随与喷口距离的增大而逐渐扩散衰减,泄漏声场的强度随孔直径的增大而增强;相同孔直径、不同泄漏蒸汽工况下的声功率级基本相同;通过Chan算法对泄漏进行定位,定位结果误差在工程允许误差范围内,定位精度较高.
Aiming at the exact location of leakage point of boiler tube of power plant, the flow field and sound field of leakage jet flow are numerically simulated.The Chan algorithm in communication engineering is introduced into the detection and detection of furnace tube leakage, respectively in open environment, laboratory environment , Simulating the normal temperature no-noise environment of the furnace and simulating the ambient temperature and high-noise environment of the furnace.The experimental results show that the axial velocity of the leakage jet flow field is the main cause of the leakage acoustic wave propagation disturbance, and the far-field noise radiation has directional characteristics ; The sound power level is the largest in the orifice area, and the sound power level is gradually diffused and attenuated along with the distance from the nozzle in the direction of the symmetry axis. The strength of the leakage sound field increases with the increase of the diameter of the hole. The same hole diameter and different leakage The acoustic power levels under the steam condition are basically the same. The Chan algorithm is used to locate the leakage. The positioning result error is within the allowable error range of the project and the positioning accuracy is high.