Wang Quan, Chang Weida, Liu Shanghao, Li Zhimin, Zhu Kaibo
School of Chemical Engineering, Anhui University of Science & Technology Huainan 232001 China
Postdoctoral Mobile Research Station for Civil Engineering, Anhui University of Science & Technology Huainan 232001 China.
RSC Adv. 2019 Sep 10;9(49):28323-28329. doi: 10.1039/c9ra05387e. eCollection 2019 Sep 9.
To study the influence of an acoustic absorbing material (AAM) on the noise and vibration of a methane-air deflagration flame in a square plexiglass tube, a high-speed video camera, pressure sensors, and a noise and vibration tester were used to test the deflagration flame propagation velocity, deflagration pressure, noise and wall vibration characteristics in the tube. The tube length is 540 mm with a cross section of 80 × 80 mm, and its wall thickness is 12 mm. The experimental results indicate that under the conditions of 8.96% CH by volume and fixed repeating obstacles, the built-in AAM of polyester fiber cotton can reduce the peak velocity of the deflagration flame propagation by 11.3%. In addition, the average maximum sound pressure level of the deflagration flame noise is decreased by 17.6%, and the peak vertical vibration velocity of the tube outer wall is decreased by 85.6%. Therefore, using AAM can effectively attenuate the flame propagation and its harmful effects. For the case with an AAM, the flame propagation velocity and deflagration pressure reached the maximum values at 33 ms after ignition, and the values were 62.50 m s and 27.74 kPa, respectively. Similarly, the time history curves of the noise and the tube wall vibration caused by deflagration presented certain correlations. The experimental results and analysis in this paper provide reference values for controlling the hazards of gas explosions in underground mines and other combustible gases in industrial pipelines.
为了研究吸声材料（AAM）对方形有机玻璃管内甲烷 - 空气爆燃火焰噪声和振动的影响，使用高速摄像机、压力传感器以及噪声和振动测试仪来测试管内爆燃火焰传播速度、爆燃压力、噪声和壁面振动特性。该管长度为540 mm，横截面为80×80 mm，壁厚为12 mm。实验结果表明，在体积分数为8.96%的CH条件下以及固定的重复障碍物情况下，内置的聚酯纤维棉吸声材料可使爆燃火焰传播的峰值速度降低11.3%。此外，爆燃火焰噪声的平均最大声压级降低了17.6%，管外壁的峰值垂直振动速度降低了85.6%。因此，使用吸声材料可以有效减弱火焰传播及其有害影响。对于有吸声材料的情况，火焰传播速度和爆燃压力在点火后33 ms达到最大值，分别为62.50 m/s和27.74 kPa。同样，爆燃引起的噪声和管壁振动的时间历程曲线呈现出一定的相关性。本文的实验结果和分析为控制地下矿井瓦斯爆炸及工业管道中其他可燃气体的危害提供了参考值。
