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Comprehensive performance evaluation of a novel Aaberg exhaust system reinforced by a swirling jet

机译：新型Aaberg涡流喷射增强排气系统的综合性能评估

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摘要

In industrial ventilation, Aaberg hood is an efficient device for the local capture of pollutants with larger capacity compared to the traditional exterior hood. This paper proposes a further optimization approach, using a swirling jet in place of the radial one in the basic Aaberg hood. Computational Fluid Dynamics simulation of the optimized device is presented. A comprehensive performance evaluation is realized by analyzing the airflow pattern, capture efficiency, and pollutant behavior. The principal direction of contaminant transport is specifically considered in the performance evaluation. Results show that as the momentum ratio changes, the optimized device has a transition between two working modes, one featuring a high momentum ratio with a jet detached from the suction flow, and the other a low momentum ratio with an attached jet to the suction flow, both having separate advantages in different installation settings. The detached jet can enhance the suction performance similar to an Aaberg hood while the swirling and returning of the attached jet can counteract the effect from the cross direction and confine the scope of pollutant dispersion. This work helps to find a more efficient device and the optimized working condition for the local capture of pollutants in different scenarios.
机译：在工业通风中，与传统的外部通风柜相比，Aaberg通风柜是一种用于本地捕获污染物的高效设备。本文提出了一种进一步的优化方法，即使用涡流射流代替基本Aaberg发动机罩中的径向射流。介绍了优化装置的计算流体动力学仿真。通过分析气流模式，捕获效率和污染物行为，可以实现全面的性能评估。性能评估中特别考虑了污染物传输的主要方向。结果表明，随着动量比的变化，优化后的设备在两种工作模式之间进行转换，一种是高动量比，将射流从吸流中分离出来，另一种是低动量比，将射流与吸流相连接。 ，两者在不同的安装设置中都有各自的优势。分离的射流可增强吸气性能，类似于Aaberg引擎盖，而附着的射流的回旋和返回可抵消横向影响，并限制污染物扩散的范围。这项工作有助于找到更有效的设备和优化的工作条件，以在不同情况下本地捕获污染物。

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