本文对气固表面分子相互作用过程进行了新的考察。在表面吸附量少时,能量分布形式为1/K_BT e^(-E/K_BT),在表面吸附量多时为ge^(-E/K_BT)。当解吸位阱的解吸能为E_d时,可以分别得到相应于两种分布的一次相遇反应概率表达式 P_m=integral...本文对气固表面分子相互作用过程进行了新的考察。在表面吸附量少时,能量分布形式为1/K_BT e^(-E/K_BT),在表面吸附量多时为ge^(-E/K_BT)。当解吸位阱的解吸能为E_d时,可以分别得到相应于两种分布的一次相遇反应概率表达式 P_m=integral from E_0 to ∞1/K_BT e^(-E/K_BT)dE/integral from E_d to ∞ 1/K_BT e^(-E/K_BT)dE和 P_d=integral from E_0 to ∞ ge^(-E/K_BT)dE/integral from E_d to ∞ ge^(-E/K_BT)dE。能量传递效率随温度升高而降低是分子能量分布转变的自然结果,催化作用的起因是深的解吸位阱的存在,振动能量调节系数的数值可以大于1。新处理法在定性和定量方面都是成功的。展开更多
To study the gas dynamic and heat transfer phenomena inside a single isolated longitudinal solid propellant surface crack,two3-D geometric models with different crack shapes were constructed.Concerning the influence o...To study the gas dynamic and heat transfer phenomena inside a single isolated longitudinal solid propellant surface crack,two3-D geometric models with different crack shapes were constructed.Concerning the influence of propagation of jet from the igniter on the flame spreading phenomena in the crack,flow region around the opening of the crack was also included in the above geometric models.A theoretical framework was then adopted to model the conjugate heat transfer in the combustion channel and the crack cavity.Numerical simulation results indicate that the ignition shock wave can spread into the crack cavity.Extremely high overpressure and pressurization rate were observed along the crack front.It is possible that the crack may propagate before the flame front reaches it.An ignited region located at the crack front near to the channel surface in downstream direction was generated long before the flame front reached the crack opening in both models.展开更多
文摘本文对气固表面分子相互作用过程进行了新的考察。在表面吸附量少时,能量分布形式为1/K_BT e^(-E/K_BT),在表面吸附量多时为ge^(-E/K_BT)。当解吸位阱的解吸能为E_d时,可以分别得到相应于两种分布的一次相遇反应概率表达式 P_m=integral from E_0 to ∞1/K_BT e^(-E/K_BT)dE/integral from E_d to ∞ 1/K_BT e^(-E/K_BT)dE和 P_d=integral from E_0 to ∞ ge^(-E/K_BT)dE/integral from E_d to ∞ ge^(-E/K_BT)dE。能量传递效率随温度升高而降低是分子能量分布转变的自然结果,催化作用的起因是深的解吸位阱的存在,振动能量调节系数的数值可以大于1。新处理法在定性和定量方面都是成功的。
文摘To study the gas dynamic and heat transfer phenomena inside a single isolated longitudinal solid propellant surface crack,two3-D geometric models with different crack shapes were constructed.Concerning the influence of propagation of jet from the igniter on the flame spreading phenomena in the crack,flow region around the opening of the crack was also included in the above geometric models.A theoretical framework was then adopted to model the conjugate heat transfer in the combustion channel and the crack cavity.Numerical simulation results indicate that the ignition shock wave can spread into the crack cavity.Extremely high overpressure and pressurization rate were observed along the crack front.It is possible that the crack may propagate before the flame front reaches it.An ignited region located at the crack front near to the channel surface in downstream direction was generated long before the flame front reached the crack opening in both models.
