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THE INFLUENCE OF THE STEFAN FLOW ON IGNITION AND BURNING OF TUNGSTEEN PARTICLES

机译:斯特凡流量对钨颗粒点火和燃烧的影响

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The tungsten powder is a perspective fuel for pyrotechnic mixtures used for different purposes. This is why the studying of characteristics of high temperature oxidization of or tungsten in different gaseous environments is so important. When the chemical reaction occurs on the surface of metals and the products of reaction (oxides) evaporates, the Stefan flow appear that has a substantial influence on the processes of high temperature heat and mass exchange and oxidization of particles. The problems reviewed in this work are: the influence of the Stefan flow on the processes of high temperature oxidization of the tungsten particle, also its influence on the ignition period t_(ign) and its integral parts: the time of inert heating t_(in) and the time of chemical heating t_(ch) (t_(ign)= t_(in+) t_(ch)). Also the influence of the Stefan flow on the temperatures of particles in these moments of time (T_(in), T_(ch)) and on the time of burning t_(burn) and the maximal temperature of burning of tungsten particle was researched.
机译:钨粉是用于不同目的的烟火混合物的透视燃料。这就是为什么研究在不同气态环境中的高温氧化特性或钨的特性如此重要。当化学反应发生在金属表面和反应产物(氧化物)蒸发时,斯特凡流量出现对高温热量和颗粒的氧化过程具有显着影响。这项工作中审查的问题是:Stefan流量对钨颗粒的高温氧化过程的影响,也对点火期T_(IGN)及其整体部分的影响:惰性加热T_(IN )和化学加热T_(CH)的时间(T_(IGN)= T_(IN +)T_(CH))。还研究了梯形流量对这些时间(T_(IN),T_(CH))和燃烧T_(燃烧)的时间和钨颗粒燃烧的最大温度的影响。

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