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CFD analysis of natural gas dispersion in engine room space based on multi-factor coupling

机译:基于多因素耦合的机舱空间天然气扩散CFD分析

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摘要

Gas supply systems typically located at the engine room space of LNG gas-fueled ships, present potential threats for fire and explosion due to gas leakage and dispersion. A validated Computational Fluid Dynamics (CFD) model is proposed for natural gas dispersion analysis in an engine room space under multi-factor coupling. Results demonstrate that gas dispersion depends on leakage rate, position and direction of release, temperature gradient, ventilation and the machinery equipment located in the engine room. Under the impact of air flow, temperature gradient and gas-buoyancy, natural gas tends to accumulate on the top of the engine room space, which can be pumped out through air-outlets. Natural gas is likely to concentrate at areas where vortex flows generate. Effective arrangement and locations of gas detectors are discussed considering the variation of gas concentration at several selected point within the engine room space. (C) 2015 Elsevier Ltd. All rights reserved.
机译:气体供应系统通常位于液化天然气气船的机舱处,由于气体泄漏和扩散,存在着火和爆炸的潜在威胁。提出了一种经过验证的计算流体动力学(CFD)模型,用于多因素耦合下机舱空间中的天然气弥散分析。结果表明,气体扩散取决于泄漏率,释放的位置和方向,温度梯度,通风和机舱内的机械设备。在气流,温度梯度和气体浮力的影响下,天然气倾向于积聚在机舱空间的顶部,可以通过排气口将其抽出。天然气可能会集中在产生涡流的区域。考虑了机舱空间内几个选定点的气体浓度变化,讨论了气体检测器的有效布置和位置。 (C)2015 Elsevier Ltd.保留所有权利。

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