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Investigation of Laminar Separation Bubble on Flat Plate with Adverse Pressure Gradient: Time-Averaged Flow Field Analysis
International Journal of Aerospace Engineering ( IF 1.1 ) Pub Date : 2021-02-11 , DOI: 10.1155/2021/6655242
Yonglei Qu 1 , Dario Barsi 2 , Daniele Simoni 2 , Pietro Zunino 2 , Yigang Luan 1
Affiliation  

The performance of turbomachinery blade profiles, at low Reynolds numbers, is influenced by laminar separation bubbles (LSBs). Such a bubble is caused by a strong adverse pressure gradient (APG), and it makes the laminar boundary layer to separate from the curved profile surface, before it becomes turbulent. The paper consists on a joint experimental and numerical investigation on a flat plate with adverse pressure gradient. The experiment provides detailed results including distribution of wall pressure coefficient and boundary layer velocity and turbulence profiles for several values of typical influencing parameters on the behavior of the flow phenomena: Reynolds number, free stream turbulence intensity, and end-wall opening angle, which determines the adverse pressure gradient intensity. The numerical work consists on carrying out a systematic analysis, with Reynolds Average Navier-Stokes (RANS) simulations. The results of the numerical simulations are critically investigated and compared with the experimental ones in order to understand the effect of the main physical parameters on the LSB behavior. For RANS simulations, different turbulence and transition models are compared at first to identify the adaptability to the flow phenomena; then, the influence of the three aforementioned parameters on the LSB behavior is investigated under a typical aggressive adverse pressure gradient. Boundary layer integral parameters are discussed for the different cases in order to understand the flow phenomena in terms of flow time-mean properties.

中文翻译:

负压梯度平板上层流分离气泡的研究:时间平均流场分析

在低雷诺数下,涡轮机械叶片轮廓的性能受到层流分离气泡(LSB)的影响。这样的气泡是由强烈的不利压力梯度(APG)引起的,它使层流边界层在变得湍流之前从弯曲的轮廓表面分离。本文是在具有不利压力梯度的平板上进行联合实验和数值研究。该实验提供了详细的结果,包括壁压系数,边界层速度和湍流分布的分布,其中包括几种影响流动现象行为的典型影响参数值:雷诺数,自由流湍流强度和端壁开角,这些决定了不利压力梯度强度。数值工作包括使用雷诺平均纳维-斯托克斯(RANS)模拟进行系统的分析。为了了解主要物理参数对LSB行为的影响,对数值模拟的结果进行了严格的研究,并与实验结果进行了比较。对于RANS模拟,首先比较不同的湍流和过渡模型,以确定对流动现象的适应性。然后,在典型的不利逆压梯度下研究了上述三个参数对LSB行为的影响。讨论了不同情况下的边界层积分参数,以便根据流动时间均值特性了解流动现象。为了了解主要物理参数对LSB行为的影响,对数值模拟的结果进行了严格的研究,并与实验结果进行了比较。对于RANS模拟,首先比较不同的湍流和过渡模型,以确定对流动现象的适应性。然后,在典型的不利逆压梯度下研究了上述三个参数对LSB行为的影响。讨论了不同情况下的边界层积分参数,以便根据流动时间均值特性了解流动现象。为了了解主要物理参数对LSB行为的影响,对数值模拟的结果进行了严格的研究,并与实验结果进行了比较。对于RANS模拟,首先比较不同的湍流和过渡模型,以确定对流动现象的适应性。然后,在典型的不利逆压梯度下研究了上述三个参数对LSB行为的影响。讨论了不同情况下的边界层积分参数,以便根据流动时间均值特性了解流动现象。首先比较不同的湍流和过渡模型,以确定对流动现象的适应性;然后,在典型的不利逆压梯度下研究了上述三个参数对LSB行为的影响。讨论了不同情况下的边界层积分参数,以便根据流动时间均值特性了解流动现象。首先比较不同的湍流和过渡模型,以确定对流动现象的适应性;然后,在典型的不利逆压梯度下研究了上述三个参数对LSB行为的影响。讨论了不同情况下的边界层积分参数,以便根据流动时间均值特性了解流动现象。
更新日期:2021-02-11
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