Large eddy simulation on the vented gasoline-air mixture explosions in a semi-confined pipe with continuous circular hollow obstacles
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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。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.
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图 3 实验和模拟所得火焰结构对比
Figure 3. Comparison between experimental and simulated flame structures at different times after ignition
图 4 实验和模拟火焰锋面位置对比
Figure 4. Comparison between experi-mental and simulated flame front locations along pipe versus time
图 5 实验和模拟超压-时间曲线对比
Figure 5. Comparison between experimental and simulated overpressure time histories of monitor point at the closed end
图 6 实验和模拟所得火焰传播速度
Figure 6. Comparison between experi-mental and simulated flame speeds
图 7 火焰结构三维图像(反应进程等值面c=0.5)
Figure 7. Three-dimensional flame structure images (iso-surface of progress variable c=0.5) at different times after ignition
图 9 外场火焰和流场耦合图
Figure 9. Coupling results of the flame propagation and flow field outside the pipe
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