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首页> 外文期刊>Journal of visualization >Surface pressure determination: a comparison between PIV-based methods and PSP measurements
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Surface pressure determination: a comparison between PIV-based methods and PSP measurements

机译：表面压力测定：基于PIV的方法与PSP测量之间的比较

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摘要

The present work investigates the challenges in measuring the surface pressure distribution using particle image velocimetry (PIV) in comparison with pressure sensitive paint (PSP) measurements. The aim of the investigation is to assess if PIV may be regarded as a complementary method to PSP, or even as a possible replacement at least for 2D flow analysis or at low speed, where PSP fails. The investigation is based on two different test cases: (1) the attached flow around a NACA-0012 airfoil and (2) the separated flow around a backward-facing step (BFS). Both cases are investigated at transonic flow conditions. For the airfoil, both PIV and PSP measurements were conducted for a direct comparison. At such high Reynolds number, the boundary layer thickness is very small, and therefore, the pressure in the flow field outside the boundary layer can be easily determined from the velocity data with an isentropic flow assumption. The results of the PIV-based surface pressure reconstruction and the one of PSP are compared with the static pressure taps installed on the model surface. For the BFS test case, synthetic PIV images are produced from a Large Eddy Simulation (LES). In this case, flow separation as well as strong viscous effects appear which inhibit the use of the isentropic flow assumption. Therefore, the Reynold averaged momentum equation is directly used and the pressure is determined solving the Poisson equation which is obtained by applying the divergence operator to the momentum equation. The results are compared with the pressure distribution on the surface given by the LES simulation. This case aims to analyze the accuracy of PIV-based surface pressure determination in case of massive flow separation. It will be shown that the deviations to the expected results are caused by the spatially discretization as well as by spatially averaging, which occurs in a standard PIV measurement. In addition, the effect of the velocity uncertainty on the estimated surface pressure distribution biases the result significantly. This implies that PSP will be hardly replaced by PIV.
机译：与压敏涂料（PSP）测量相比，本工作调查了使用颗粒图像测速法（PIV）测量表面压力分布方面的挑战。研究的目的是评估PIV是否可被视为PSP的补充方法，或者至少在2D流量分析中或在PSP失败时以低速被视为可能的替代方法。该调查基于两个不同的测试案例：（1）围绕NACA-0012机翼的附着流，以及（2）围绕后向台阶（BFS）的分离流。两种情况都在跨音速流动条件下进行了研究。对于机翼，进行了PIV和PSP测量以进行直接比较。在这样高的雷诺数下，边界层的厚度非常小，因此，在等熵流动假设的情况下，可以容易地从速度数据确定边界层外部的流场中的压力。将基于PIV的表面压力重建结果和PSP之一的结果与安装在模型表面上的静压水龙头进行了比较。对于BFS测试用例，由大涡模拟（LES）生成合成的PIV图像。在这种情况下，会出现流动分离以及强烈的粘性效应，从而阻碍了等熵流动假设的使用。因此，直接使用雷诺平均动量方程并通过求解泊松方程来确定压力，该泊松方程是通过将散度算子应用于动量方程而获得的。将结果与LES模拟给出的表面压力分布进行比较。本案例旨在分析大流量分离情况下基于PIV的表面压力确定的准确性。可以看出，与预期结果的偏差是由空间离散和空间平均引起的，这是在标准PIV测量中发生的。此外，速度不确定性对估计的表面压力分布的影响会大大偏向结果。这意味着PSP几乎不会被PIV取代。

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  • 来源
    《Journal of visualization》 |2017年第3期|581-590|共10页
  • 作者

    Tagliabue Andrea; Scharnowski Sven; Kähler Christian J.;

  • 作者单位

    Department of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, Neubiberg, Germany;

    Department of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, Neubiberg, Germany;

    Department of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, Neubiberg, Germany;

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  • 正文语种 eng
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  • 关键词

    PIV; Pressure estimation; PSP; Transonic flow;

    机译：PIV;压力估算;PSP;跨音速流;

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