Compressible Subsonic Potential Flow Past a 2D Given Sharp Angular Unbounded Domain

<正>In this paper,we focus on the two-dimensional subsonic flow problem around an infinite long ramp.The flow is assumed to be steady,isentropic and irrotational,namely,the movement of the flow is described by a second elliptic equation.By the use of a separation variable method,Strum-Liouville theorem and scaling technique,we show that a nontrivial subsonic flow around the infinite long ramp does not exist under some certain assumptions on the potential flow with a low Mach number.