为获取气固两相流浓度与超声波能量衰减关系,分析了超声波衰减原理与气固两相流流体模型,搭建了气固两相流超声波测量试验平台,利用重力输送试验装置产生气固两相流流体,在超声波换能器之间距离为0.2m,采用频率为50 kHz换能器进行测量试验;分析处理大量试验数据,拟合出一定距离下超声波衰减情况与气固两相流体浓度变化的近似映射函数,并通过区间估计表征测量数据置信度区间.试验发现,在超声波发射接收距离一定、发射频率一定时,气固两相流体浓度越大,超声波衰减信号也越大.验证了采用超声波测量技术方法对于气固两项流浓度相关参数的检测是可行有效的.%In order to obtain the relationship between the concentration of gas-solid two-phase flow and the attenuation of ultrasonic energy,the ultrasonic attenuation principle and the gas-solid two-phase flow model are analyzed.The experimental platform of gas-solid two-phase flow ultrasonic measurement is constructed.The gas-solid two-phase flow is generated by gravity transport test device.The distance between ultrasonic transducers is 0.2 m,and it is measured by 50 kHz transducer.Analysis and processing a large number of experimental data,approximate mapping function of ultrasonic attenuation and gas-solid two-phase fluid concentration at a certain distance was fitted,and the confidence interval of the measured data was characterized by interval estimation.The experimental results show that when the distance between the ultrasonic transmitting and receiving is constant and the transmitting frequency is constant,the larger the concentration of gas solid two phase,the greater the attenuation of ultrasonic attenuation.It is proved that the ultrasonic measurement technique is feasible and effective for the detection of the two parameters of gas-solid two-phase flow concentration.
展开▼
