We review the characteristic structure of the two-dimensional adjoint Euler equations. We derive the compatibility and jump conditions along characteristics and show that the characteristic information can be used to obtain exact predictions for the adjoint variables in certain supersonic flows.

翻译：本文回顾了二维伴随欧拉方程的特征结构。我们推导了沿特征线的相容条件与跳跃条件，并证明特征信息可用于在某些超音速流动中获得伴随变量的精确预测。