气云形状对无约束气云爆炸温度场的影响

In order to analyze the influence of vapor cloud shape on temperature field effect of unconfined vapor cloud explosion (UVCE) and obtain creditable prediction method of explosion temperature effect, the transient temperature fields of cylindrical and hemispherical UVCEs with same methane concentration and mass were numerically studied by computational fluid dynamics (CFD) technology. According to numerical simulation results, the concepts of UVCE’s temperature-near-field and temperature-far-field were proposed, the corresponding ranges were given, and the temperature attenuation laws and differences in corresponding regions with different vapor cloud shapes were presented. Through comparing with Baker fireball model, the accuracy and visualizability in acquisition of entire temperature effect based on numerical simulation were further validated. The functional relations among maximum temperature, horizontal distance, initial temperature and vapor cloud mass in temperature-near-field and temperature-far-field were deduced by means of data fitting, respectively. These conclusions provided quantitative basis for forecast and protection of UVCE disaster.

Influence of vapor cloud shape on temperature field of unconfined vapor cloud explosion

In order to analyze the influence of vapor cloud shape on temperature field effect of unconfined vapor cloud explosion (UVCE) and obtain creditable prediction method of explosion temperature effect, the transient temperature fields of cylindrical and hemispherical UVCE's with same methane concentration and mass were nu-merically studied by computational fluid dynamics (CFD) technology.According to numerical simulation results, the concepts of UVCE's temperature-near-field and temperature-far-field were proposed, the corresponding ranges were given, and the temperature attenuation laws and differences in corresponding regions with different vapor cloud shapes were presented.Through comparing with Baker fireball model, the accuracy and visualizability in ac-quisition of entire temperature effect based on numerical simulation were further validated.The functional relations among maximum temperature, horizontal distance, initial temperature and vapor cloud mass in tempera-ture-near-field and temperature-far-field were deduced by means of data fitting, respectively.These conclusions provided quantitative basis for forecast and protection of UVCE disaster.