Combustion Mechanisms of Complex Metal Particles

复杂金属颗粒的燃烧机理

• 批准号: 0202765
• 负责人: Arvind Varma
• 金额: $ 34.6万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2004-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0202765&HistoricalAwards=false
• 关键词: Combustion; Mechanisms; Complex; Metal; Particles

The objective of this work is to establish the mechanisms of combustion of complex metal particles consisting of two different metals, typically an aluminum core covered by another metal such as nickel, titanium or zirconium, in inert or oxidizing atmospheres. The study includes the fundamental processes that control ignition and combustion of single particles and propagation of reaction waves in clouds of particles. Influences on combustion of chemistry, morphology (size and shape), and concentration of particles, as well as composition of the gas phase, are clarified on both the microscopic (single particle) and macroscopic (particle cloud) scales. To do this, advanced experimental techniques are developed based on electrodynamic levitation and electrodynamic fluidization. Also, computer-assisted electrothermography of complex metal wires is used to obtain kinetic data on metal-metal and metal-gas reactions. These data provide a basis for modeling combustion of complex metal particles, accounting for such characteristics as intermetallic reactions and cracking of solid shells.The results of this work are directly relevant for applications in both materials synthesis and propulsion. Combustion of particle suspensions in gas is an attractive method for continuous production of intermetallic compounds. Complex metal particles in rocket propellants offer reduced agglomeration and lower ignition temperature than pure aluminum.

本工作的目的是建立由两种不同的金属组成的复合金属颗粒的燃烧机制，通常是由另一种金属，如镍，钛或锆，在惰性或氧化气氛中覆盖的铝芯。 该研究包括控制单个粒子的点火和燃烧以及粒子云中反应波的传播的基本过程。 燃烧的化学，形态（大小和形状），和颗粒的浓度，以及气相的组成的影响，澄清在微观（单颗粒）和宏观（颗粒云）尺度。 为此，开发了基于电动悬浮和电动流化的先进实验技术。 此外，计算机辅助电热图的复杂的金属丝被用来获得金属-金属和金属-气体反应的动力学数据。 这些数据为模拟复杂金属颗粒的燃烧提供了基础，说明了诸如金属间反应和固体壳体的破裂等特征。这项工作的结果与材料合成和推进的应用直接相关。 颗粒悬浮物在气体中的燃烧是一种连续制备金属间化合物的有吸引力的方法。 与纯铝相比，火箭推进剂中的复合金属颗粒具有更低的团聚和更低的点火温度。