The mass ratio and free stream turbulence have attained to considerably good level.

引射效率和气流的湍流度也达到相当好的水平。

youdao

For high levels of free-stream turbulence, streaky structures in boundary layer with the spanwise variations alternating will be generated.

对背景湍流度很大的流动，边界层中有时会产生沿展向周期分布的流向速度的条纹结构。

youdao

Meanwhile, the stream turbulence effects on the measurement are studied. Finally, the problems which must be researched further are presented for indicating boundary-layer transition.

本文同时还研究了气流湍流度对测量方法的影响，最后提出转捩测量技术尚需进一步研讨的问题。

youdao

In the past, pilots thought airplanes moving up and down in the jet stream caused such turbulence.

MSN: Blame gravity waves for turbulence - Technology & science - Science - LiveScience | NBC News