反应速率对热壅塞冲压加速器的推力影响  

Influences of Reaction Ratio on the Thrust of Thermally Choked Ram Accelerator

作　　者：孙晓晖[1] 陈志华[1] 薛大文[1] 

机构地区：[1]南京理工大学瞬态物理重点实验室,南京210014

出　　处：《燃烧科学与技术》2012年第6期562-568,共7页Journal of Combustion Science and Technology

基　　金：高等学校博士学科点专项科研基金资助项目(20103219110037);江苏省普通高校研究生科研创新计划资助项目(CXZZ11_0233)

摘　　要：为了研究冲压加速器热壅塞模式时反应速率对推力的影响,利用ROE/HLL计算格式,结合自适应网格加密技术(AMR)与沉浸边界法(IBM),数值模拟了不同反应速率条件下的冲压加速器热壅塞模式燃烧流场.结果表明,若反应速率适当,则可产生稳定热壅塞燃烧,此时推力来自弹丸底部因爆燃产生的高压区.在此基础上,若进一步提高或降低反应速率,火焰阵面无法保持在弹丸底部,无法形成稳定的推力,导致弹丸推进失败.To investigate the influences of reaction ratio on the thrust of a thermally choked ram accelerator, in this paper, with the employ of the high order ROE/HLL scheme, and combined with adaptive mesh refinement （AMR） technique and immersed boundary method （IBM）, the thermally choked flow-field of a ram accelerator under different chemical reaction ratios were simulated numerically. The results show that, when the reaction ratio is within a proper range, the mode of a steady thermally chocked combustion can be formed, and the thrust is generated from the high pressure area of the projectile base caused by combustion. However, with the further increase or decrease of reaction ratio beyond this range, the flame front will not be stable at the base of the projectile, and the steady thrust cannot be generated, which will result in the failure of projectile propulsion.

关 键 词：冲压加速器 热壅塞 燃烧 

分 类 号：TJ399[兵器科学与技术—火炮、自动武器与弹药工程] O357[理学—流体力学]