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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Lagrangian and Eulerian pressure field evaluation of rod-airfoil flow from time-resolved tomographic PIV
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Lagrangian and Eulerian pressure field evaluation of rod-airfoil flow from time-resolved tomographic PIV

机译：时间分辨层析PIV对杆翼流的拉格朗日和欧拉压力场评估

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摘要

This work investigates the rod-airfoil air flow by time-resolved Tomographic Particle Image Velocimetry (TR-TOMO PIV) in thin-light volume configuration. Experiments are performed at the region close to the leading edge of a NACA0012 airfoil embedded in the von Kármán wake of a cylindrical rod. The 3D velocity field measured at 5 kHz is used to evaluate the instantaneous planar pressure field by integration of the pressure gradient field. The experimental data are treated with a discretized model based on multiple velocity measurements. The time separation used to evaluate the Lagrangian derivative along a fluid parcel trajectory has to be taken into account to reduce precision error. By comparing Lagrangian and Eulerian approaches, the latter is restricted to shorter time separations and is found not applicable to evaluate pressure gradient field if a relative precision error lower than 10% is required. Finally, the pressure evaluated from tomographic velocity measurements is compared to that obtained from simulated planar ones to discuss the effect of 3D flow phenomena on the accuracy of the proposed technique.
机译：这项工作通过时间分辨断层层析粒子图像测速技术（TR-TOMO PIV）在细光体积配置中研究了杆翼的气流。在埋入圆柱形杆的vonKármán尾管中的NACA0012机翼前缘附近的区域进行实验。在5 kHz处测量的3D速度场用于通过压力梯度场的积分来评估瞬时平面压力场。用基于多个速度测量的离散模型处理实验数据。必须考虑用于评估沿流体包裹轨迹的拉格朗日导数的时间间隔，以减少精度误差。通过比较拉格朗日方法和欧拉方法，后者仅限于较短的时间间隔，如果需要相对精度误差低于10％，则不适用于评估压力梯度场。最后，将通过层析速度测量得到的压力与从模拟平面测量得到的压力进行比较，以讨论3D流动现象对所提出技术的准确性的影响。

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