Di Sarli Valeria, Di Benedetto Almerinda, Russo Gennaro
Istituto di Ricerche sulla Combustione, Consiglio Nazionale delle Ricerche, 80124 Naples, Italy.
J Hazard Mater. 2009 Sep 30;169(1-3):435-42. doi: 10.1016/j.jhazmat.2009.03.115. Epub 2009 Mar 31.
In this work, a validated Large Eddy Simulation model of unsteady premixed flame propagation is used to study the phenomenology underlying vented gas explosions in the presence of obstacles. Computations are run of deflagrating flames in a small-scale combustion chamber closed at the bottom end and open at the opposite face. A single obstacle is centred inside the chamber. Methane-air mixtures of various compositions (ranging from lean to stoichiometric and rich), and obstacles with different area blockage ratios (30, 50 and 70%) and shapes (circular, rectangular and square cross-section in the flow direction) are investigated. All cases are initialized from stagnation. The competition between combustion rate and venting rate allows explaining both number and intensity of the overpressure peaks observed.
在这项工作中，一个经过验证的非稳态预混火焰传播大涡模拟模型被用于研究存在障碍物时泄爆气体爆炸的潜在现象学。计算在一个底端封闭、相对面敞开的小型燃烧室中进行爆燃火焰模拟。一个单一障碍物位于燃烧室中心。研究了不同成分（从贫燃到化学计量比和富燃）的甲烷 - 空气混合物，以及具有不同面积阻塞比（30%、50%和70%）和形状（沿流动方向的圆形、矩形和正方形横截面）的障碍物。所有情况均从滞止状态初始化。燃烧速率和泄爆速率之间的竞争能够解释所观察到的超压峰值的数量和强度。
