立方体障碍物对高压射流分散的影响:CFD 研究

IF 3.6 3区 工程技术 Q2 ENGINEERING, CHEMICAL
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引用次数: 0

摘要

在加工工业安全方面,主要的事故情况之一是高压气体物质的释放。由于天然气具有高度可燃性,随着喷射的发展,点燃的可能性会增加,其最大影响范围与其可燃性下限(LFL)有关。这项工作旨在模拟和评估高压天然气射流与立方体障碍物之间的相互作用,之所以选择立方体障碍物,是因为这些障碍物在加工工业中普遍存在,如工业园区中的存储单元或建筑物。天然气 LFL 处云层的最大范围通常会受到射流与障碍物相互作用的影响,因此需要采用复杂的数值方法(如计算流体动力学 (CFD))进行精确估算。因此,本研究提供了挑战传统建模方法(如整体建模)的重要见解,在不影响安全性的前提下提供了具有成本效益的替代方法。研究结果表明,使用 CFD 方法并不总是必要的,因为它在很大程度上取决于储气压力、直径大小和射流的释放高度。在储存压力为 65-130 巴、喷口直径为 2.54 厘米、释放高度超过 2.75 米的情况下,可以采用积分模型等简单方法,而不会造成任何重大的可靠性损失。当立方体障碍物距离释放源较远时,情况尤其如此。在较低的释放高度下,尤其是在喷口直径较大的情况下,应采用 CFD 方法,因为射流与立方体之间的相互作用与射流的发展密切相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cuboid obstacle influence on high-pressure jet dispersion: A CFD study

In the context of the process industry safety, one of the main accidental scenarios is the release of high-pressure gaseous material. Since natural gas is highly flammable, the likelihood of ignition increases as the jet develops, with a maximum area of effect related to its lower flammability limit (LFL). This work aims at simulating and evaluating the interaction between high-pressure natural gas jets and cuboid obstacles, which were selected due to their prevalence in the process industry as storage units or buildings present in industrial parks. The maximum extent of the cloud at the LFL of natural gas is often influenced by the jet-obstacle interactions, necessitating complex numerical methods like computational fluid dynamics (CFD) for accurate estimation. Therefore, this study provides pivotal insights that challenge traditional modelling approaches, like integral ones, offering cost-effective alternatives where needed without compromising on safety.

The findings indicate that using a CFD approach is not always necessary, as it largely depends on the storage pressure, diameter size, and the release height of the jet. At storage pressures of 65–130 bar with an orifice diameter of 2.54 cm, and a release height above 2.75 m, simpler methods like integral models are applicable without any substantial reliability loss. This is especially true when the cuboid obstacle is farther away from the release source. At lower release heights, especially if coupled with a larger orifice diameter, the CFD approach should be utilised as jet-cuboid interactions become highly relevant to the development of the jet.

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来源期刊
CiteScore
7.20
自引率
14.30%
发文量
226
审稿时长
52 days
期刊介绍: The broad scope of the journal is process safety. Process safety is defined as the prevention and mitigation of process-related injuries and damage arising from process incidents involving fire, explosion and toxic release. Such undesired events occur in the process industries during the use, storage, manufacture, handling, and transportation of highly hazardous chemicals.
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