碰撞风弓形激波的渐近张开角：特征角近似
Asymptotic Opening Angles for Colliding-Wind Bow Shocks: the Characteristic-Angle Approximation
摘要：
通过考虑高超声速球形发散风中矢量动量通量的平流和相互作用，在激波气体包含在沿单一特征张开角流出的圆锥中的近似下，导出了风碰撞激波锥的渐近张开角的简单解析描述。高辐射和高绝热的限制处理，他们的比较是新的结果。解析封闭形式的表达式获得推断的风动量比作为所观察到的激波张开角的函数，允许的渐近弓激波的显着形状被用作碰撞风的更详细的建模的初步约束。在这个过程中，我们探索从一般的角度来看，在应用到全球冲击几何的限制，所谓的戴森近似，它断言在整个冲击的垂直冲压压力的局部平衡。
英文摘要：
By considering the advection and interaction of the vector momentum flux in highly supersonic spherically diverging winds, we derive a simple analytic description of the asymptotic opening angle of a wind-collision shock cone, in the approximation that the shocked gas is contained in a cone streaming out along a single characteristic opening angle. Both highly radiative and highly adiabatic limits are treated, and their comparison is the novel result. Analytic closed-form expressions are obtained for the inferred wind momentum ratios as a function of the observed shock opening angle, allowing the conspicuous shape of the asymptotic bow shock to be used as a preliminary constraint on more detailed modeling of the colliding winds. In the process, we explore from a general perspective the limitations in applying to the global shock geometry the so-called Dyson approximation, which asserts a local balance in the perpendicular ram pressure across the shock.
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