连续圆孔障碍物对油气泄压爆炸火焰特性影响大涡模拟 |
| |
引用本文: | 李国庆,杜扬,齐圣,王世茂,李蒙,李润.连续圆孔障碍物对油气泄压爆炸火焰特性影响大涡模拟[J].爆炸与冲击,2018,38(6):1286-1394. |
| |
作者姓名: | 李国庆 杜扬 齐圣 王世茂 李蒙 李润 |
| |
作者单位: | 陆军勤务学院油料系,重庆,401311;陆军勤务学院油料系,重庆401311;62250部队,青海格尔木816099 |
| |
基金项目: | 国家自然科学基金项目51276195重庆市研究生科研创新项目CYB16128 |
| |
摘 要: | 采用WALE模型和Zimont预混火焰模型对内置圆孔障碍物油气泄压爆炸火焰特性进行了大涡模拟,并将大涡模拟计算结果和RNG k-ε湍流模型计算结果以及实验结果进行对比分析,验证了大涡模拟的精确性。结果表明:(1)大涡模拟在预测油气爆炸超压、火焰传播速度以及火焰形态变化等方面比RNG k-ε湍流模型精确度更高,且能表现出更多流场的精细化结构;(2)障碍物诱导管道内形成湍流度较高的流场区域,导致火焰产生褶皱弯曲变形,增大火焰面积,加速火焰传播;(3)爆炸超压、火焰传播速度和火焰面积内在联系密切,具有显著的耦合性,且随时间的变化趋势存在高度的一致性。
|
关 键 词: | 油气泄压爆炸 大涡模拟 障碍物 火焰特性 |
收稿时间: | 2017-06-22 |
Large eddy simulation on the vented gasoline-air mixture explosions in a semi-confined pipe with continuous circular hollow obstacles |
| |
Institution: | 1.Department of Petroleum Supply Engineering, Army Service University, Chongqing 401311, China2.62250 Troops, Golmud 816099, Qinghai, China |
| |
Abstract: | WALE LES model coupled with Zimont premixed combustion model were applied to study the characteristics of the flame of gasoline-air mixture explosions. Results by LES simulation, RNG k-ε model and experiments were compared with each other, and the conclusions show that:(1) LES is more accurate than RNG k-ε turbulence model in predicting gasoline-air mixture explosion overpressure, flame propagation speed and the variation of flame shape, and it can show more refined structure of flow field; (2) The obstacles induce a turbulent flow field in the pipeline, which can cause the flame to produce wrinkle and bend deformation, increase the flame surface area and accelerate the flame propagation; (3) The explosion overpressure, the flame propagation speed and the flame surface area are closely related. They have significant coupling and show nearly the same changing tendency. |
| |
Keywords: | |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《爆炸与冲击》浏览原始摘要信息 |
| 点击此处可从《爆炸与冲击》下载免费的PDF全文 |
|