Abstract Hot fluid pockets or hot spots can be found in many engineering systems, such as chemical reactors, internal heat engines and gas turbines. They are inherently fluid parcels with rapid temperature rising in comparison with the base medium and usually convect with the flow inertia. Due to the higher energy content, hot fluid pockets can change thermal characteristics of the system. Ignoring the destruction of them, which has been mainly missed in the literature, can therefore change the related predictions. The destruction of the hot fluid pockets is so investigated in this paper using a large eddy simulation and some statistical indices are used to reveal the coherence of the pockets. The results show that the convecting hot pocket can be significantly affected by hydrodynamic and thermal conditions, such that it may loss the initial tempo-spacial distribution completely. It is found that the hot spot behavior in lower Reynolds number range is not as regular as that at the higher Reynolds number range. Furthermore, the real thermal boundary conditions of convective heat transfer on the walls can completely change the destruction pattern in comparison to that in the adiabatic combustor. The extent of the destruction is various, depending on the flow conditions. The current results will help better prediction for systems involving hot fluid pockets.

中文翻译：

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通过冷通道流动破坏对流热流体袋的大涡模拟

摘要 热流体袋或热点可以在许多工程系统中找到，例如化学反应器、内热机和燃气轮机。与基础介质相比，它们本质上是具有快速升温的流体块，并且通常与流动惯性对流。由于较高的能量含量，热流体袋可以改变系统的热特性。忽略它们的破坏，这在文献中主要被遗漏，因此可以改变相关的预测。本文使用大涡模拟研究了热流体袋的破坏，并使用了一些统计指标来揭示热流体袋的连贯性。结果表明，对流热袋受水动力和热力条件的影响显着，以至于它可能完全失去最初的时空分布。发现在较低雷诺数范围内的热点行为不像在较高雷诺数范围内那样规律。此外，与绝热燃烧器相比，壁上对流传热的真实热边界条件可以完全改变破坏模式。破坏的程度是不同的，取决于流动条件。当前的结果将有助于更好地预测涉及热流体袋的系统。与绝热燃烧器相比，壁上对流传热的真实热边界条件可以完全改变破坏模式。破坏的程度是不同的，取决于流动条件。当前的结果将有助于更好地预测涉及热流体袋的系统。与绝热燃烧室相比，壁上对流传热的真实热边界条件可以完全改变破坏模式。破坏的程度是不同的，取决于流动条件。当前的结果将有助于更好地预测涉及热流体袋的系统。