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首页> 外文期刊>International Journal of Heat and Fluid Flow >An accurate data base on laminar-to-turbulent transition in variable pressure gradient flows
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An accurate data base on laminar-to-turbulent transition in variable pressure gradient flows

机译：在可变压力梯度流动中的层状动荡过渡的精确数据库

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摘要

An experimental data base on attached and separated-flow transitional boundary layers, under various levels of free-stream turbulence, Reynolds number and pressure gradient has been composed, with the aim of providing high-accuracy data and boundary conditions for development and testing of laminar-to-turbulent transition models. Experiments were carried out on the boundary layer developing on a flat plate installed within a channel with a variable opening angle. The test section imposes acceleration to the boundary layer followed by deceleration, which can be varied. Time Resolved Particle Image Velocimetry (TR-PIV) and Laser Doppler Velocimetry (LDV) data have been acquired on the boundary layer evolution, as well as the free-stream properties in terms of mean velocity and fluctuating velocity components. The overall test matrix spans 3 Reynolds numbers (70,000;150,000;220,000), 4 free-stream turbulence intensity levels (Tu = 1.5; 2.5; 3.5; 5%) and 4 pressure gradients (opening angle alpha = 0; 5; 9; 12deg). This large variation of flow parameters allows a gradual shift of the mode of transition from a bypass process in attached flow, occurring with zero (Blasius like) and mild adverse pressure gradients at high free-stream turbulence, to separated-flow transition, occurring with low Reynolds number, low free-stream turbulence intensity and elevated adverse pressure gradient.
机译：所附和分离流过渡边界层的实验数据基于各种自由流湍流，雷诺数和压力梯度，目的是为Laminar的开发和测试提供高精度数据和边界条件的目的 - 湍流过渡模型。在具有可变开口角度的平板上的边界层上进行实验。测试部分施加到边界层的加速，然后减速，这可以改变。在边界层演化中获取了时间分辨的粒子图像速度（TR-PIV）和激光多普勒速度（LDV）数据，以及在平均速度和波动速度分量方面的自由流性质。整体测试矩阵跨越3雷诺数（70,000; 150,000; 220,000），4个自由流湍流强度水平（Tu = 1.5; 2.5; 3.5; 5％）和4个压力梯度（打开角度α= 0; 5; 9; 12deg）。流动参数的这种大变化允许从附加流程中的旁路过程逐渐移位，以零（Blasius）和温和的不良压力梯度在高自由流湍流下发生，以分离流动过渡低雷诺数，低自由流湍流强度和升高的不良压力梯度。

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