液固两相流压降规律及超声法压降测量

液固两相流广泛存在于能源动力、石油化工等工业过程,两相流压降作为重要的流动参数,有助于流动建模及流态分析。建立液固两相压降测量模型,提出了一种结合超声多普勒及超声透射衰减的液固两相超声压降测量方法。搭建液固两相流动实验平台,对两相压降规律进行研究。两相混合流速和固相体积分数升高时,液固两相压降均逐渐增加。在固相体积分数为0.28%～1.37%,两相混合流速为0.9～1.65 m/s时,根据液固两相压降测量模型及Churchill模型的超声法得到的两相压降与差压传感器测量的压降平均相对误差为4.93%和5.10%,验证了测量模型的准确性。针对非均匀分布的两相流态进行压降测量,进一步拓展了压降测量模型的应用范围。本研究工作为非侵入超声法测量液固两相压降提供了方法基础。

Liquid-solid two-phase flow pressure drop and ultrasound-based pressure drop measurement method

Liquid-solid two-phase flow is widely used in energy, petrochemical and other industrial processes. The pressure drop of twophase flow is an important flow parameter which is helpful for flow modeling and analysis. A liquid-solid two-phase pressure drop measurement model is formulated. An ultrasonic-based liquid-solid two-phase pressure drop measurement method is proposed, which combines the ultrasound Doppler and ultrasound transmission attenuation. A liquid-solid two-phase flow experiment platform is established to study the law of two-phase pressure drop. As the two-phase mixing flow rate and the solid phase volume fraction increase, the pressure drop of the liquid-solid two phases gradually increases. When the solid phase volume fraction is 0. 28% ~ 1. 37% and the two-phase mixing flow rate is 0. 9~ 1. 65 m/ s, the average relative errors between the two-phase pressure drop measured by the liquidsolid two-phase pressure drop measurement model and the Churchill model using the ultrasound method and the pressure drop measured by the differential pressure sensor are 4. 93% and 5. 10% , respectively. These results show the accuracy of the measurement model. The pressure drop measurement for the two-phase heterogeneous flow is carried out and it further broadens the application range of the pressure drop measurement model. This research work provides a basic method for non-invasive ultrasound measurement of liquid-solid two-phase pressure drop.