在恒定水位下的水平圆管紊流中,采用激光测速仪测得液体质点通过固定空间点A的各个方向瞬时流速Ux,Uy对时间的曲线Uxt,Uyt。可以看出,某空间点的瞬时速度虽然随时间不断变化,但是始终围绕着某一平均值而不断跳动。这种跳动叫做脉动。这个平均值称为时间平均流速,又称时均流速。 可以根据时均流速是否随时间变化,将紊流分为恒定流和非恒定流。
将声学多普勒流速仪自动测量和分析系统应用于紊流边界层时均流速分布的测量,取得了较好的实验成果。
The better experimental results are acquired using the ADV automatic measuring and analyzing system to measure the time average velocity distribution in turbulence bo…
通过室内水槽模型试验,探讨了有低矮植被生长的河道糙率变化、时均流速的垂线分布以及紊动强度的垂向变化规律。
By the indoor flume model experiment, the changing law of vertical velocity distribution and turbulent intensity of submerged vegetation channel linings are discussed.
采用三维声学多普勒流速仪对弯道上游顺直河段水流特性进行了系统的试验研究,全面分析了水流的三维时均流速及流场和纵向紊动强度。
The flow characteristics of the straight chanel up the bend were studied by means of the advanced three-dimensional acoustics Doppler current meter.
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