从线性化的三维可压非定常欧拉方程组（一阶时间相关的双曲型方程组）出发，通过合理的数学方法，消去压力项，得到只包含振荡速度矢量项的对空间的二阶偏微分方程组，在已知定常速度场后，这一方程组很容易求解，不但简化与加速了求解过程，而且避免了双曲型方程组数值求解过程中的稳定性问题及人工粘性项的影响。 Starting from the linear three-dimensional compressible unsteady Euler equations (first-order time-dependent hyperbolic equations), by eliminating the pressure term by a reasonable mathematical method, the second order of the space velocity vector term In the system of partial differential equations, this system of equations is easy to solve after the steady state velocity field is known, which not only simplifies and accelerates the solution process, but also avoids the stability problems and the viscous items in the numerical solution of the hyperbolic system influences.