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Study of particle deposition on the complex components of environmental control systems

机译：研究环境控制系统复杂组件上的颗粒沉积

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As most airplanes do not have HEPA filters for filtering outside air, particulate matter in the outdoor air can deposit on the environmental control systems (ECS) of the airplanes. The particles that accumulate on the various surfaces of the ECS components can affect their thermal performance and may lead to component failures. This study experimentally and numerically investigated the particle deposition on a heat exchanger and a turbocharger, which are key components of ECS with complex geometry. A test rig was built to obtain the monodisperse particle deposition fractions by measuring the particle concentration upstream and downstream of the components with the weighing method. The tested particles ranged from 1 to 8 mu m in diameter. Different Reynolds-averaged Navier-Stokes (RANS) models, together with a modified Lagrangian method, were used to predict the total particle deposition fractions in the tested components. The computed particle deposition was compared with the experimental data. The results showed that the RNG k-epsilon model with near-wall correction provided the most accurate prediction of the particle deposition fraction on the heat exchanger and turbocharger. The particle deposition fraction increased significantly with the particle size. CFD simulation provided detailed information about the particle deposition distribution inside the heat exchanger and turbocharger. The location and number of deposited particles depended mainly on the particle size and air velocity. This investigation identified a suitable tool for studying particle deposition in the ECS of commercial airplanes. (C) 2019 Elsevier Ltd. All rights reserved.
机译：由于大多数飞机没有用于过滤外部空气的HEPA过滤器，因此室外空气中的颗粒物可能会沉积在飞机的环境控制系统（ECS）上。积聚在ECS组件各个表面上的颗粒会影响其热性能，并可能导致组件故障。这项研究通过实验和数值研究了热交换器和涡轮增压器上的颗粒沉积，它们是具有复杂几何形状的ECS的关键组件。建立了一个试验台，通过称量法测量组件上游和下游的颗粒浓度，以获得单分散的颗粒沉积分数。所测试的颗粒的直径为1至8μm。使用不同的雷诺平均Navier-Stokes（RANS）模型以及改进的拉格朗日方法来预测测试组件中的总颗粒沉积分数。将计算出的颗粒沉积与实验数据进行比较。结果表明，具有近壁校正的RNGk-ε模型可以最准确地预测热交换器和涡轮增压器上的颗粒沉积分数。颗粒沉积分数随颗粒尺寸显着增加。 CFD仿真提供了有关热交换器和涡轮增压器内部颗粒沉积分布的详细信息。沉积颗粒的位置和数量主要取决于颗粒大小和空气速度。这项调查确定了一种用于研究商用飞机ECS中颗粒沉积的合适工具。 （C）2019 Elsevier Ltd.保留所有权利。

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