Abstract

Thermal radiation hazards of fireballs induced by gas pipeline leakage and explosion have increasingly contributed to the occurrence of accidental disasters. To reveal the mechanism of fireball’s thermal hazards, the temperature characteristics and propagation behaviors were theoretically and experimentally studied in real scenario. This study proposed an optimization method based on optical computerized tomography (OCT) and reconstruction algorithm. The results of the new OCT algorithm were simulated by using MATLAB, which can realize the visualization of 3D temperature field of the fireball. Moreover, a full-scale gas pipeline leakage and explosion experiment was undertaken, and a series of testing data from the explosion fireball’s thermal radiation were collected by using infrared thermography technique. The simulated accuracy of 3D temperature field by the optimized OCT algorithm was verified by comparing with experimental data, it found that the relative error between the two results ranged from 10.54 to 14.67%, while the average error was less than 11%. This comparative investigation can provide a new practical application of 3D analytical method for thermal radiation damage of fireballs under gas explosion in both steady and dynamic states.

中文翻译：

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基于预测算法和实验验证的燃气管道爆炸火球三维热场

摘要

燃气管道泄漏和爆炸引起的火球热辐射危害越来越多地导致了意外灾害的发生。为了揭示火球热危害的机理，在实际场景中对温度特性和传播行为进行了理论和实验研究。该研究提出了一种基于光学计算机断层扫描（OCT）和重构算法的优化方法。利用MATLAB对新的OCT算法的结果进行了仿真，可以实现火球3D温度场的可视化。此外，还进行了一次大规模的燃气管道泄漏和爆炸实验，并使用红外热成像技术从爆炸火球的热辐射中收集了一系列测试数据。通过优化OCT算法对3D温度场的模拟精度与实验数据进行比较，发现两者的相对误差在10.54％至14.67％之间，平均误差小于11％。这项比较研究可以为稳态和动态状态下气体爆炸下火球的热辐射损伤提供3D分析方法的新的实际应用。