AIAD模型为基础的倾斜管中液泛现象数值模拟研究

Calibration and error analysis of cryogenic thermocouple used in liquid nitrogen cavitation experiment

利用数值计算方法,采用欧拉多相流框架和AIAD拖曳力模型,针对液氮-饱和氮蒸气流体在倾斜管(θ=10°)中的液泛现象开展研究。将倾斜管两端压差出现陡增作为液泛发生判断依据。研究发现,液泛现象发生时,气相流体表观速度随着液相流体表观速度增大而逐渐减小。在此基础上,结合水-空气液泛研究成果,对比液氮-饱和氮蒸气与水-空气两组工质的液泛速度特点。并进一步探究,管道倾角对液氮-饱和氮蒸气液泛速度的影响规律。

The numerical calculation of flooding phenomenon of LN2-VN2 in inclined tube（ θ = 10°） was carried out with the help of Euler multiphase frame and AIAD drag force model.The flooding onset was mainly identified by the sharp increase of pressure drop between two ends of the tube. It’s found that the superficial gas velocity of flooding onset decreases monotonously with the increasing liquid velocity. Basing on the results,comparison of flooding velocities of water-air and LN2-VN2 is conducted. Furthermore,the influence of tube inclination on the flooding velocity of LN2-VN2 is explored.