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首页> 外文期刊>International Journal of Heat and Fluid Flow >Experimental investigations on frictional resistance and velocity distribution of rough wall with regularly distributed triangular ribs
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Experimental investigations on frictional resistance and velocity distribution of rough wall with regularly distributed triangular ribs

机译:规则分布三角形肋的粗糙壁摩擦阻力和速度分布的实验研究

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The relationship between the flow resistance of a turbulent flow over triangular ribs regularly distributed on a wall surface and the velocity distribution around the ribs was investigated experimentally. A concentric cylinder device composed of an inner test cylinder and an outer cylinder was employed to measure the flow resistance using the torque of the shaft of the inner cylinder and the velocity distribution of the flow around a rib by laser Doppler velocimetry (LDV) simultaneously. We prepared four inner test cylinders having 4,8,12 and 16 triangular ribs on the surface with the same interval between them. Each rib had an isosceles right triangle V-shape and a height of 2 mm. To investigate the relationship between flow resistance and velocity distribution, we estimated the frictional drag and pressure drag acting on the surface of the ribs separately using the velocity distribution. Therefore, we could also estimate the total flow resistance using the velocity distribution. As a result of the experiment, the flow resistance and the attachment point downstream of the rib were shown to depend on the distance between ribs. Moreover, the flow resistance estimated using the velocity distribution had good agreement with the flow resistance measured using the torque of the inner cylinder.
机译:实验研究了在壁面上规则分布的三角形肋上的湍流流动阻力与肋周围速度分布之间的关系。使用由内部测试气缸和外部气缸组成的同心气缸装置,同时使用内部气缸的轴的扭矩和通过激光多普勒测速仪(LDV)进行的肋骨周围流动的速度分布来测量流动阻力。我们准备了四个内部测试圆柱体,它们在表面上具有4,8,12和16个三角形肋,并且它们之间的间隔相等。每个肋骨都有一个等腰直角V形,高度为2毫米。为了研究流阻与速度分布之间的关系,我们使用速度分布分别估计了作用在肋骨表面的摩擦阻力和压力阻力。因此,我们还可以使用速度分布来估算总流阻。实验结果表明,流阻和肋骨下游的连接点取决于肋骨之间的距离。此外,使用速度分布估算的流动阻力与使用内缸扭矩测量的流动阻力具有良好的一致性。

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