粒子成像测速在锥量热计实验中的可行性

S. Delcour, D. Herbert, F. Ouf, A. Coppalle, N. Azéma, L. Ferry, Lopez-Cuesta Jose-Marie, F. Salm, M. Talbaut, J. Yon
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引用次数: 0

摘要

实验结果表明,粒子成像测速技术在锥形量热仪中的可行性。聚甲基丙烯酸甲酯(PMMA)板在其表面被氧化铝颗粒(Dev=4.4 μm)作为播种颗粒污染,允许PIV分析。对于所研究的每个热流密度(25,35和45 kW/m), PMMA在热降解过程中通过气泡破裂释放颗粒。在最高的热通量(35和45千瓦/米)下,可以注意到粒子的“层”,而在最小的热通量(25千瓦/米)下,释放是受限的,而且更加不稳定。速度随聚合物表面以上高度的增加而增加,从PMMA表面的0.03 m/s增加到锥形加热器底部的0.3 m/s,这些结果与先前的实验和数值模拟相吻合。总的来说,这一首次尝试证明了PIV分析的巨大潜力,与我们的沉积装置相关,用于研究涉及冒泡聚合物的锥形量热计实验中的流场。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Feasibility of Particle Imaging Velocimetry in Cone Calorimeter experiments
Experimental results are reported on the feasibility of particle imaging velocimetry in a cone calorimeter. PolyMethyl MethAcrylAte (PMMA) plates have been contaminated at their surface by alumina particles (Dev=4.4 μm) as seeding particles allowing PIV analysis. Particles are released by bubble bursting during the thermal degradation of the PMMA for each heat flux investigated (25, 35 and 45 kW/m). A “layer” of particles could be noticed for the highest heat flux (35 and 45 kW/m) while for the smallest flux (25 kW/m), the release is confined and more erratic. Velocity increases as a function of the height above the polymer surface from 0.03 m/s at the PMMA surface to 0.3 m/s at the bottom of the conical heater and these results are in good agreement with previous experiments and numerical simulations. As an overall conclusion, this first attempt demonstrates the huge potential of PIV analysis, associated to our deposition set-up, for investigating flow field during cone calorimeter experiments involving bubbling polymers.
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