凝聚态自反应材料激光点火理论模型

A Theoretical Model for Laser Ignition of Condensed Selfreaction Materials

基于热理论建立了凝聚态自反应材料的一维激光点火理论模型，并对其作了解析以揭示点火延迟时间与激光处理参数和材料特征之间的关系。尝试进行了激光点燃Ｎｉ－３３．３ａｔ％Ａｌ粉末压坯的实验，并将实验值与计算值做了对比以验证模型的合理性。结果表明计算值与实验值吻合较好。因此，激光辐射点火从根本上应归结于热的作用。

A theoretical model for laser - induced ignition of condensed self - reaction materials was set up based on thermal theory,and an analytical solution wassought to reveal the relationship of ignition delay time with laser processing parameters as well as material characteristics. An experiment of laser ignition of Ni - 33. 3 at% Al powder compacts was also attempted and the comparison between experimental and computational data of ignition delay time was made to verify the validity of the model. The results show that the calculated values agree well with that of the experiment. As a consequence, the mechanism of ignition by laser beams irradiation can be attributed to thermal in origin.