湿蒸汽介质中超声波传播特性的数值计算OA

During the normal operation or commissioning of nuclear power plant equipment,a large amount of wet steam is usually generated in the secondary circuit pipelines between the turbine generator set and the equipment,as well as in the pipelines from the steam generator to the high-pressure heater.The flow velocity and humidity of the wet steam in these pipelines directly affect the operational efficiency and safety of the equipment.Therefore,it is necessary to detect the state of the high-temperature wet steam in the pipelines.Relevant technology for ultrasonic waves in gas-liquid two-phase flow are employed,and numerical simulation calculation methods are adopted to investigate the propagation characteristics of ultrasonic waves in high-temperature wet steam media.Based on the EACH mathematical simplified model of ultrasonic propagation in two-phase flow medium,the relevant physical parameters of IAPWS-IF97 water vapor standard at 200,220,240,260 and 280℃are used.The numerical relationship between ultrasonic velocity and acoustic attenuation coefficient and temperature,ultrasonic frequency,humidity and average droplet size is calculated by MATLAB software.The experimental results show that by comparing and analyzing the numerical calculation results under different working conditions,the influence of temperature on the ultrasonic propagation characteristics is relatively large,the influence of ultrasonic frequency is relatively small,and the influence of humidity and average droplet radius is very significant,which lays a certain foundation and provides some reference for the further application of ultrasonic technology.