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Numerical study of the instantaneous flow fields by large eddy simulation and stability analysis in a single aisle cabin model

机译：单通道机舱模型中大涡模拟和稳定性分析的瞬时流场数值研究

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Airflow movement is one of the most important physical parameter greatly influencing the contaminants transmission and passengers' thermal perception in aircraft cabin environment. Although many measured and computational results showed that the airflows in aircraft cabins were highly unsteady or even unstable, most of the existing studies focused on time-averaged air distributions in aircraft cabins. The instantaneous characteristics of flow fields, such as airflow velocity fluctuation, turbulence intensity and fluctuation frequency, were seldom reported. In this paper, a refined large eddy simulation (LES) was conducted to investigate the complex airflow characteristics in a simplified Boeing 737-200 cabin model. Simulated results indicated that the flow fields in this cabin model, especially around the aisle region, displayed obvious quasi-periodic large scale unsteadiness and continuing instabilities, as seen in our PIV measurements, even though the boundary conditions were fixed and symmetrical with the middle plane and various perturbations were as much removed as possible. A triple decomposition was used to extract the highly unsteady characteristics of the instantaneous flow fields and the large scale unsteadiness term was used to interpret why the actual kinetic energies of turbulence in LES was amplified. The structural stability analysis approach was used to investigate the mechanism of such unstable flow fields. Saddle points and heteroclinic orbits were found to exist in cross sections of the cabin model. The Peixoto theorem was used to interpret the reason for this unstable instantaneous flow fields in this type of flow regime and geometry. (C) 2015 Elsevier Ltd. All rights reserved.
机译：气流运动是最重要的物理参数之一，极大地影响了机舱环境中的污染物传播和乘客的热感。尽管许多测量和计算结果表明，机舱中的气流非常不稳定，甚至不稳定，但是大多数现有研究集中在机舱中时间平均的空气分布上。很少报告流场的瞬时特征，例如气流速度波动，湍流强度和波动频率。在本文中，进行了改进的大涡模拟（LES），以研究简化的波音737-200机舱模型中的复杂气流特性。模拟结果表明，在我们的PIV测量中，即使边界条件是固定的并且与中间平面对称，该机舱模型中的流场，特别是在过道区域附近，也表现出明显的准周期大尺度不稳定性和持续的不稳定性。并尽可能地消除了各种干扰。使用三次分解来提取瞬时流场的高度不稳定特性，并使用大规模不稳定术语来解释为什么LES中湍流的实际动能会被放大。使用结构稳定性分析方法来研究这种不稳定流场的机理。发现座舱模型的横截面中存在鞍点和异质轨道。 Peixoto定理用于解释这种流动状态和几何形状中这种不稳定的瞬时流场的原因。 （C）2015 Elsevier Ltd.保留所有权利。

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