The results show that the propagation speed of the wave is not equal to the speed of energy flux, but nearly equal to the real part of the complex group velocity.
结果表明，波的传播速度并不等于能流速度，而与复群速度的实部近似相等。
Energy saving of centrifugal compressor not only satisfies the flux and pressure of pipeline system, but also verifies vibration when choosing the extent of lowering speed.
压缩机节能改造不仅要满足管路系统流量、压头的需要，在确定降速幅度时还要进行喘振的校核。
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