【摘要】 基于改进的Bakke -Hjertager燃烧模型与相应的控制方程 ,建立了描述可燃气云爆炸的理论模型。采用SIMPLE算法 ,对气云爆炸场进行了数值模拟。以 0 .0 2mm厚度的聚乙烯薄膜为约束物 ,进行了半球形乙炔 /空气预混气云爆炸实验。实验分别在 0 .5、0 .75、1、1.2 5m 4个气云半径下进行 ,数据采集系统记录了超压分布。计算超压与实验值相比较 ,最大偏差为 11.9% ,平均偏差为 4 .14 %。结果表明 ,本文方法可以用来预测可燃气云爆炸强度。更多还原

【Abstract】 Based on the improved Bakke-Hjertager combustion model and relevant governing equations, the theoretical models of flammable vapor explosion were established. In this paper, the SIMPLE algorithm was adopted to simulate explosion fields of vapor cloud. Taking 0.02mm polyethylene film as confinement, experimental investigations into explosion of hemispheric pre-mixed ethyne /air vapor cloud were conducted. The overpressure distributions of vapor clouds with radii 0.5, 0.75, 1 and 1.25 m respectively were measured with data acquisition system experimentally. Compared with the test data, the maximum and average deviations of calculation results are 11.9% and 4.14% respectively. The results show that the model in the paper can forecast the explosion power of flammable vapor cloud.更多还原