论文标题
具有可变绝热指数的两组分流体的自相似爆炸波
Self-similar Blast Wave for A Two-component Fluid with Variable Adiabatic Index
论文作者
论文摘要
我们提出了一种自相似（SS）解决方案，以在球形强爆炸波（BW）的后面流体动力学非相关流动，并通过均匀的等离子体，在冲击阵线上具有有效的相对粒子加速度。该流程由具有相对论组件的理想两流体模型描述，因此后打击气的有效SS绝热指数$γ$从$ 5/3 $到$ 4/3美元不等。该解决方案是通过数值计算的，并将其与标准SEDOV解决方案进行比较。我们发现，解决方案中的BW中心由相对论组成部分主导，其中$γ= 4/3 $用于膨胀的膨胀，而相对论组成部分则主导了冲击阵线的中等加速度效率的内部。相对论粒子加速度的总体效率可以提高$ 2 $，这是由于膨胀过程中相对论成分的绝热能源损失率较慢。相对论组成部分的优势趋势可能在扩展天体物理两流体系统（例如超新星残留物，宽度星系叶）中很常见。
We propose a self-similar (SS) solution to hydrodynamic non-relativistic flow behind a spherical strong blast wave (BW) passing through a homogeneous plasma with efficient relativistic particle acceleration at the shock front. The flow is described by an ideal two-fluid model with a relativistic component so that the post-shock gas has an effective SS adiabatic index $ γ$ varying from $ 5/3 $ to $ 4/3 $. This solution is calculated numerically and compared with the standard Sedov solution. We find that the BW center in our solution is dominated by the relativistic component with $ γ=4/3 $ for the divergence of expansion there, and the relativistic component dominates the interior for a moderate acceleration efficiency at the shock front. The overall efficiency of relativistic particle acceleration can be enhanced by a factor of $ 2 $ due to the slower adiabatic energy loss rate of the relativistic component during expansion. Tendency of the dominance by the relativistic component may be common in expanding astrophysical two-fluid systems such as supernova remnants, lobes of radio galaxies.
