supersonic frequency

The adjusting technique about the resonance frequency in the measurement of the supersonic wave velocity

超声波波速测量中谐振频率的调试技巧

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No matter the boundary layer is subsonic or supersonic, nonparallel effects are obvious at the critical Reynolds number, such that the critical Reynolds number is reduced and the frequency range of unstable disturbances is broadened at the critical Reynolds number.

无论是在亚音速还是超音速边界层中，非平行性的影响在临界雷诺数处比较明显，具体是一使得临界雷诺数变小，二使得临界雷诺数处增长扰动的频率范围变得更大。

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If the operating frequency is supersonic, the valve operation should be inaudible to humans.

如果操作的频率是超声波的, 那么人们是听不到阀门运转的.

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