The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed...The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed in this paper. Other factors such as coating add-on, curing temperature and time are studied too. The results show that the factors above all have different extent of influence upon FR effect.展开更多
A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperatu...A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperature.The rich flammability limit of C3H8/air was determined to be 9.2% C3H8.Stretched flame propagation speeds,stretched laminar burning velocities and unstretched laminar burning velocities near rich C3H8/air flammability limits were measured at different equivalence ratios.Outwardly propagating spherical flames were used to study the sensitivities of the flame propagation speeds and laminar burning velocities to flame stretch using Markstein lengths.Unstretched laminar burning velocity at rich flammability limit was determined to be 1.09cm/s.Lewis numbers were less than unity in rich C3H8/air and negative Markstein lengths were concluded.Absolute values of Markstein lengths were found to decrease linearly with equivalence ratios increase.展开更多
基于专门设计的数据同步采集实验平台,立足于层流这一基本状态,以典型的丁烷为燃料介质,对其进行了专门的实验研究,得出了喷射火焰长度随燃气供应速度的变化规律。运用图像技术进行深入分析处理,并分别与现有的Schlichting和H A Berker...基于专门设计的数据同步采集实验平台,立足于层流这一基本状态,以典型的丁烷为燃料介质,对其进行了专门的实验研究,得出了喷射火焰长度随燃气供应速度的变化规律。运用图像技术进行深入分析处理,并分别与现有的Schlichting和H A Berker等方法计算的火焰长度进行比较。结果表明,前者吻合良好而后者偏差较大,从而确认可利用Schlichting方法对层流状态下的丁烷喷射火焰长度进行计算,为喷射型火灾脱火法施救等问题的深入研究提供计算基础。展开更多
文摘The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed in this paper. Other factors such as coating add-on, curing temperature and time are studied too. The results show that the factors above all have different extent of influence upon FR effect.
基金Supported by the Research Foundation of Beijing Institute of Technology(20070242004)
文摘A small cubic closed vessel with schlieren measurement technique combined with high-speed video camera were used to study limit flame properties under microgravity conditions at atmospheric pressure and room temperature.The rich flammability limit of C3H8/air was determined to be 9.2% C3H8.Stretched flame propagation speeds,stretched laminar burning velocities and unstretched laminar burning velocities near rich C3H8/air flammability limits were measured at different equivalence ratios.Outwardly propagating spherical flames were used to study the sensitivities of the flame propagation speeds and laminar burning velocities to flame stretch using Markstein lengths.Unstretched laminar burning velocity at rich flammability limit was determined to be 1.09cm/s.Lewis numbers were less than unity in rich C3H8/air and negative Markstein lengths were concluded.Absolute values of Markstein lengths were found to decrease linearly with equivalence ratios increase.
文摘基于专门设计的数据同步采集实验平台,立足于层流这一基本状态,以典型的丁烷为燃料介质,对其进行了专门的实验研究,得出了喷射火焰长度随燃气供应速度的变化规律。运用图像技术进行深入分析处理,并分别与现有的Schlichting和H A Berker等方法计算的火焰长度进行比较。结果表明,前者吻合良好而后者偏差较大,从而确认可利用Schlichting方法对层流状态下的丁烷喷射火焰长度进行计算,为喷射型火灾脱火法施救等问题的深入研究提供计算基础。
