Tianyi Wang , Yuepei Cai , Lei Guo , Chuanting Wang , Yuan He , Yong He
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引用次数: 0
Abstract
Al/PTFE (Aluminum/Polytetrafluoroethylene) is a typical kind of reactive material, which has a variety of potential applications in weapon systems. In this paper, laser ignition experiments were carried out for a pressed and sintered mixture of Al and PTFE powder, and the parameters of Al/PTFE combustion process was measured by infrared thermometer, C-type corundum thermocouple and high-speed camera. The results show that Al particle size and Al content have a significant impact on energy release behavior. As particle size decreases, energy release increases in Al/PTFE specimens with micron-sized Al particles. However, for nano-sized particles, 500 nm particles release more energy than 50 nm particles, likely due to greater oxidation. Besides, increasing Al content enhances the reaction rate of Al/PTFE, but excess Al reduces the energy release. Moreover, in the specimens prepared with mass ratio of 26.5/73.5, self-propagating combustion can be achieved in the specimens with nano Al particles, whereas it fails to occur in the specimens with micron Al particles. And intense chemical reactions were detected in Al/PTFE specimens with smaller particle sizes, with a temperature variation of up to 1763.85 K in 1 s. The highest temperature can reach 2523.45 K. Based on the above experiments, an Al/PTFE laser ignition combustion model was established to characterize the temperature dynamics and combustion mechanisms during the reaction process.
期刊介绍：
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.
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