AP/HTPB二维火焰结构和燃速数值分析

• 作 者: 叶锐 余永刚 曹永杰
• 机 构: 南京理工大学能源与动力工程学院,
• 出 处: 工程热物理学报
• 发表日期: 2013年03期
• 关键词: AP/HTPB composite solid propellant Pe number combustion characteristic

为研究AP/HTPB复合固体推进剂燃烧过程,气相采用简化的两步化学反应机制,耦合气相和固相热边界,建立了二维周期性三明治非稳态燃烧模型。数值结果表明:AP体积分数为0.8时,当压力小于0.5 MPa时,火焰总体呈现预混燃烧特性;当压力升高时,Pe数增大,逐步形成以扩散为主导的多火焰结构;在燃烧过程中,化学计量数曲线不与AP/HTPB界面相交,表明入口扩散的存在;当压强为2 MPa,AP体积分数为0 75～0.9时,火焰温度随着AP含量的增大而降低。

In order to study the combustion process of AP / HTPB composite solid propellant, a two-dimensional periodic sandwiched unsteady combustion model was established by using a simplified two-step chemical reaction mechanism and coupling the gas phase and the solid-state thermal boundary. Numerical results show that when the volume fraction of AP is 0.8, when the pressure is less than 0.5 MPa, the flame presents the premixed combustion characteristics as a whole. When the pressure increases, the Pe number increases and gradually forms a diffusion-dominated multi-flame structure. In the process, the stoichiometric curve does not intersect with the AP / HTPB interface, indicating the presence of inlet diffusion. When the pressure is 2 MPa and the AP volume fraction is 0 75 ~ 0.9, the flame temperature decreases with the increase of AP content.