It adopts distortionindex to describe the inlet pressure distortion, which could only be studied through distortion experiments before.
该软件利用综合畸变指数来描述进气畸变，实现了以往只有通过畸变试验才能进行的对进气畸变的研究。
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By modifying, the separation zone behind the shaft and turn loss at upwind side are all reduced. Modifying inlet maintains high pressure recovery, and the distortionindex is reduced by 74% at most.
The Harmonious Distortion characteristic of telemetry seismic data acquisition systems is an important performance index, which affects the quality of seismic acquisition data directly.