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Numerical investigation of flow oscillation in a contracting and expanding passage subject to vibration

机译：伸缩通道中振动振动的数值模拟

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Stable and accurate fuel supply and distribution is a key issue in flow regulation. Because of the small space of a hypersonic vehicle, the contracting and expanding passage is often used to measure the flow rate. However, we experimentally found that the contracting and expanding paisage vibration leads to flow oscillation. The flow oscillation significantly affects the fuel flow measurement, and even threatens the safety of the filling process. To understand the mechanism of flow oscillation, a three-dimensional model of a contracting and expanding passage, with hydrocarbon fuel was established. After validating the present model with experimental results, a detailed discussion was presented to study the hydrodynamic characteristics of flow oscillation in a contracting and expanding passage subject to vibration. The behaviors of steady arid unsteady flow fields under different conditions were investigated. The results show that axial passage vibration leads to flow oscillation because the vibrating passage causes a change in the fluid velocity field. The recirculatory separation and mainstream regions change periodically. The amplitude of the vibrational velocity and the inlet Reynolds number of the fuel have a considerable influence on flow dynamic behavior. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：稳定和准确的燃料供应和分配是流量调节中的关键问题。由于高超音速飞行器的空间较小，因此通常使用收缩和膨胀通道来测量流量。但是，我们通过实验发现，收缩和扩展的Paisage振动会导致流振荡。流量振荡会严重影响燃油流量测量，甚至威胁到加油过程的安全性。为了了解流动振荡的机理，建立了使用烃类燃料的伸缩通道的三维模型。在用实验结果验证了本模型后，进行了详细的讨论，以研究受振动作用的收缩和膨胀通道中流动振荡的流体动力学特性。研究了不同条件下的稳态和非稳态流场的行为。结果表明，轴向通道振动会导致流动振荡，因为振动通道会引起流速场的变化。再循环区和主流区域定期变化。燃料的振动速度幅度和进气雷诺数对流动动力学行为有很大影响。 （C）2019 Elsevier Masson SAS。版权所有。

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