稳定跨音速气流方程（Steady transonic gas flow equation）是一个非线性偏微分方程：

\alphau_{x}u_{xx}+u_{yy}=0

解析解
:u(x, y) = _C4+_C5(_C1+_C2x+_C3*y)
:u(x,y)=(_C4(C1x+C3)+C5y+C6)C1^3/C2^2
:u(x,y)=C1xy+C2x+C3y+C4
:u(x,y)=((x+C2)/(y+C1))^(3/2)-(y+C4)^4+C3*y+C5
:u(x,y)=(y+C1)^7+4(x+C2)^(3/2)(y+C1)^(5/2)-(x+C2)^3/(y+C1)^2+C3*y+C4

行波图
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