文章在坡度为0°~40°的山地模型上开展火蔓延实验,研究不同的中心坡度和侧面坡度对火线轮廓、火线夹角、火焰长度和火蔓延速率(rate of fire spread,ROS)的影响,分析火焰对前方未燃烧的燃料的预热作用。研究发现:山脊火会形成...文章在坡度为0°~40°的山地模型上开展火蔓延实验,研究不同的中心坡度和侧面坡度对火线轮廓、火线夹角、火焰长度和火蔓延速率(rate of fire spread,ROS)的影响,分析火焰对前方未燃烧的燃料的预热作用。研究发现:山脊火会形成水滴状火线,山谷火线在侧坡上呈V形;中心坡度和侧面坡度会对山地火蔓延行为产生重要影响,随着中心坡度增加,山谷火焰对流换热明显增强,ROS快速增加。展开更多
The flow field in a cold model of 2500 t/d five-stage cyclone preheater and precalciner system was numerically simulated. Renault stress model (RSM) turbulent model was adopted to simulate the flow field, and a hybrid...The flow field in a cold model of 2500 t/d five-stage cyclone preheater and precalciner system was numerically simulated. Renault stress model (RSM) turbulent model was adopted to simulate the flow field, and a hybrid mesh scheme was selected to generate calculation mesh. With the first order upwind difference, finite-volume method was used to convert turbulent equations into difference equations pressure-velocity coupling which were solved by the classic simple algorithm, and during the course of numerical solution, mesh self-adapting technology was applied. The main flow field structures of the whole system and each part of the cold model were studied by analyzing the simulation results.展开更多
文摘文章在坡度为0°~40°的山地模型上开展火蔓延实验,研究不同的中心坡度和侧面坡度对火线轮廓、火线夹角、火焰长度和火蔓延速率(rate of fire spread,ROS)的影响,分析火焰对前方未燃烧的燃料的预热作用。研究发现:山脊火会形成水滴状火线,山谷火线在侧坡上呈V形;中心坡度和侧面坡度会对山地火蔓延行为产生重要影响,随着中心坡度增加,山谷火焰对流换热明显增强,ROS快速增加。
文摘The flow field in a cold model of 2500 t/d five-stage cyclone preheater and precalciner system was numerically simulated. Renault stress model (RSM) turbulent model was adopted to simulate the flow field, and a hybrid mesh scheme was selected to generate calculation mesh. With the first order upwind difference, finite-volume method was used to convert turbulent equations into difference equations pressure-velocity coupling which were solved by the classic simple algorithm, and during the course of numerical solution, mesh self-adapting technology was applied. The main flow field structures of the whole system and each part of the cold model were studied by analyzing the simulation results.
