  In this paper, we consider the well-posedness theory of two-dimensional
compressible subsonic jet flows for steady full Euler system with general
vorticity. Inspired by the analysis in arXiv:2006.05672, we show that the
stream function formulation for such system admits a variational structure.
Then the existence and uniqueness of a smooth subsonic jet flow can be
established by the variational method developed by Alt, Caffarelli and
Friedman. Furthermore, the far fields behavior of the flow and the existence of
a critical upstream pressure are also obtained.
