摘要
对惰性气体在3种不同压力下的泄爆进行了实验,并分别获得了流场图像、实验中气源出口截面的气体静压与周围环境静压之比分别为1.2、2.0和2.5。同时应用改造后的高阶精度MUSCL差分格式,对泄爆流场进行了数值模拟,将计算结果和实验结果对比后,发现两者吻合。根据射流动力学理论,分析了产生这种波系结构和流场压力变化的原因。当压力比为1·2时,波系为驻波形式;随着压力比的增加,射流波系中出现激波结构;当压力比达到2·5时,流动变为高度欠膨胀,波系中的激波在强度和直径上得到了加强。结果对进一步研究可燃性介质的泄爆过程,提供了可供参照的图像和数据。
Flow field photos are gained when inert gas is ventilated with three kinds of pressure, and the ratio of static pressure between the section of gas generator exit and surroundings are 1.2, 2.0 and 2.5, Simultaneously, a modified high order MUSCI scheme was used to simulate the vent flow field. The simulated test result is consistent with the experimental result, The reasons of forming a shock-cell structure and changing the flow field pressure were analyzed with jet dynamics. The jet field is only a standing wave when the pressure ratio is 1.2. As the ratio increases, shock waves appear in the jet field. Inert gas is enough under expanded when the ratio is 2.5. Intensity and diameter of shock waves are enhanced. The results provide referencial images and data for exploring vent of flammable matter.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第4期472-474,482,共4页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(19832030)
关键词
惰性气体泄爆
激波
数值模拟
inert gas vent
shock waves
numerical simulation
