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Approximate solutions for the ignition of a solid as a function of the Biot number

机译:固体点火的近似解与毕奥数的关系

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The ignition of a finite planar 1-dimensional solid is addressed for constant applied radiant heat flux. An ignition temperature criterion is used, with constant properties, and linearized reradiation. An approximate integral analysis leads to analytic formulas to predict the ignition time in terms of Biot (Bi) number and heat flux. The accuracy of the integral solution is found to be good compared to the exact infinite series solution for the conduction equation. The integral model is then used to assess the accuracy of common ideal thick and thin formulas for ignition. There is a domain of heat flux and Bi where the ideal formulas are not accurate. An example is given where the integral model is accurately applied to ignition data to illustrate the range where the ideal formula is not accurate.
机译:针对恒定施加的辐射热通量,解决了有限平面一维固体的点火问题。使用具有恒定特性和线性化辐射的点火温度标准。近似积分分析产生了解析公式,可以根据比奥(Bi)数和热通量预测点火时间。发现与传导方程的精确无穷级数解相比,积分解的精度很好。然后,使用积分模型评估常见理想理想点火公式的厚度。理想公式不准确时,存在热通量和Bi的域。给出了一个将积分模型准确地应用于点火数据的示例,以说明理想公式不准确的范围。

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