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首页> 外文期刊>Biology Open >Boundary layer control by a fish: Unsteady laminar boundary layers of rainbow trout swimming in turbulent flows
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Boundary layer control by a fish: Unsteady laminar boundary layers of rainbow trout swimming in turbulent flows

机译：鱼的边界层控制：虹鳟在湍流中游荡的不稳定层流边界层

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The boundary layers of rainbow trout,?Oncorhynchus mykiss?[0.231±0.016?m total body length (L) (mean±s.d.);?N=6], swimming at 1.6±0.09?L?s?1?(N=6) in an experimental flow channel (Reynolds number,?Re=4×105) with medium turbulence (5.6% intensity) were examined using the particle image velocimetry technique. The tangential flow velocity distributions in the pectoral and pelvic surface regions (arc length from the rostrum,?lx=71±8?mm,?N=3, and?lx=110±13?mm,?N=4, respectively) were approximated by a laminar boundary layer model, the Falkner?Skan equation. The flow regime over the pectoral and pelvic surfaces was regarded as a laminar flow, which could create less skin-friction drag than would be the case with turbulent flow. Flow separation was postponed until vortex shedding occurred over the posterior surface (lx=163±22?mm,?N=3). The ratio of the body-wave velocity to the swimming speed was in the order of 1.2. This was consistent with the condition of the boundary layer laminarization that had been confirmed earlier using a mechanical model. These findings suggest an energy-efficient swimming strategy for rainbow trout in a turbulent environment.
机译：虹鳟的边界层为“ Oncorhynchus mykiss” [全长0.231±0.016？m（L）（平均值±sd）;? N = 6]，以1.6±0.09？L？s？1？（N = 6）使用粒子图像测速技术检查了具有中等湍流（强度为5.6％）的实验流道（雷诺数，ΔRe＝ 4×105）。胸骨和骨盆表面区域的切向流速分布（距讲台的弧长，分别为lx = 71±8？mm，？N = 3和？lx = 110±13？mm，？N = 4）通过层边界层模型Falkner？Skan方程近似。胸腔和骨盆表面的血流状态被认为是层流，与湍流相比，它可以产生更少的皮肤摩擦阻力。推迟流动分离，直到后表面上方发生涡旋脱落（1x = 163±22？mm，？N = 3）。体波速度与游泳速度之比约为1.2。这与早先使用机械模型确认的边界层分层条件是一致的。这些发现表明，在动荡的环境中，虹鳟鱼的节能游泳策略。

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