稀相气固两相流探针声检测方法的测量信号特征分析

Measurement signal feature analysis of acoustic detection method with a probe of dilute phase gas-solid two-phase flow

设计了基于探针方法,且声检测传感器安装于管道外的气固两相流检测传感器结构。针对该结构,通过单颗粒与多颗粒的撞击实验,结合频谱分析,发现声信号的峰值频率固定,经分析为颗粒激发探针在固有频率处的振动所致,可将探针近似为悬臂梁进行分析。通过管道实验可知,固有频率处的峰值与固相颗粒的速度和质量分数具有很强的相关性,该信号特征有望应用于气固两相流的在线检测中。

A novel sensor with probe based on acoustic detection is designed.The probe is inserted into the pipe while the acoustic sensor for gas-solid two-phase flow detection is placed outside the pipe.Experiments of single-particle impact and multi-particle impact are carried out and combined with spectrum analyzsis,peak frequency of the acoustic signal is found to be fixed,which is caused by vibration of particles stimulated probe at its natural frequency,and the probe can be approximated regarded as a cantilever beams during the analysis.Pipe experiment shows that peak value at natural frequency has strong relevance with the velocity and mass fraction of the solid phase flow,features of the signal can be used in on-line detection of gas-solid two phase flow in the future.