Conjugated spherical metal shells are an idea combination of pressure vessels,and the total vessel volume could be adjusted through different combinations of the components.But the difficulties of manufacturing those ...Conjugated spherical metal shells are an idea combination of pressure vessels,and the total vessel volume could be adjusted through different combinations of the components.But the difficulties of manufacturing those conjugated parts limited its wide application of such vessels.The results of non-die explosive forming of conjugated spherical pressure vessels might provide a new and simple manufacturing method of such construction.展开更多
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 tempera...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.展开更多
文摘Conjugated spherical metal shells are an idea combination of pressure vessels,and the total vessel volume could be adjusted through different combinations of the components.But the difficulties of manufacturing those conjugated parts limited its wide application of such vessels.The results of non-die explosive forming of conjugated spherical pressure vessels might provide a new and simple manufacturing method of such construction.
基金Supported by the National Natural Science Foundation of China（10772029） the Ph.D Programs Foundation of Ministry of Education of China（20050007029） the Independent Research Subject of State Key Laboratory of Explosion Science and Technology（ZDKT08-02）
文摘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.
