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采用高速摄影技术,考察了液化四氟乙烷发生小孔泄漏时,其水平泄漏和垂直泄漏的初始云团演化行为、泄漏的质量流率、喷射速度和喷射角,并与理论计算公式进行了对比。结果表明:水平喷射两相云团尾部出现涡流,涡流大幅加快了云团向空气中扩散的速率;垂直喷射的两相云团在地面形成液池,液池大幅增加了液化气体向空气中蒸发的速率。水平泄漏试验的喷射角与容器内超压变化规律相似,泄放初期喷射角逐渐增大,经历一段平坦期,到泄放末期喷射角减小。水平泄漏和垂直泄漏的初始喷射速度分别为25 m/s和20 m/s,与理论值26.6 m/s基本吻合。水平泄漏的质量流率的试验值和理论值分别为0.0598 kg/s和0.0684 kg/s,垂直泄漏的分别为0.0472 kg/s和0.059 6 kg/s,结果对比基本吻合,推荐的泄漏质量流率和小孔喷射速度公式可以用于液化四氟乙烷小孔泄漏。
Using high-speed photography technology, the initial cloud evolution of horizontal leakage and vertical leakage, the mass flow rate of leakage, the jet velocity and jet angle were investigated in the case of small hole leakage of liquefied tetrafluoroethane. The theoretical calculation formula was used Compared. The results show that eddy current appears at the tail of horizontal jet two-phase cloud, and the eddy current greatly accelerates the rate of clouds diffusing into the air. The two-phase vertical jet two-phase cloud forms a pool on the ground, and the pool greatly increases the evaporation of the liquefied gas into the air s speed. The horizontal angle of leakage test is similar to that of overpressure in the container. The initial injection angle gradually increases, and after a flat period, the injection angle decreases until the end of the discharge. The initial injection velocities of horizontal leakage and vertical leakage are 25 m / s and 20 m / s, respectively, which are in good agreement with the theoretical value of 26.6 m / s. The experimental values and theoretical values of horizontal leakage mass flow rate were 0.0598 kg / s and 0.0684 kg / s respectively, and the vertical leakage was 0.0472 kg / s and 0.059 6 kg / s, respectively. The results were basically in agreement with each other. The recommended leakage mass flow The rate and orifice injection rate equations can be used to liquefy tetrafluoroethane orifice leaks.