Research Initiation Awards: Ignition and Combustion Phenomena of Laser-Ignited Baron Agglomerate at Elevated Pressures

这项研究的目的是研究 环境压力对点火延迟时间和燃烧的影响 硼团聚时间。 在这次调查中，一个探测器- 负载硼团聚安装在高压 燃烧室由CO2激光束点燃。 使用 激光点火技术与高压燃烧 腔室将允许环境压力的变化， 氧化剂摩尔分数 表面温度测量 激光点燃的硼在点燃期间聚集， 燃烧事件将使用近红外线进行， 双色高温计 结合双色 高温计，宽带辐射计用于记录 由硼附聚物发射的辐射。 来自时间 双色高温计的输出和宽带 辐射计，可以确定点火 预燃延迟时间和燃烧时间 作为环境压力的函数， 氧化剂摩尔分数 硼浆料与常规的硼浆料相比具有显著的优点， 喷气燃料时，评估的能量密度的基础上。 这 项目将提供硼的实验测定 工作压力下颗粒团聚燃烧速率 范围为1至20 atm，典型的高性能空气- 呼吸引擎

The objective of the proposed research is to study the effect of ambient pressure on the ignition delay time and the burning time of boron agglomerates. In this investigation a probe- supported boron agglomerate mounted inside a high-pressure combustion chamber is ignited by a CO2 laser beam. The use of the laser ignition technique and high-pressure combustion chamber will permit the variation of the ambient pressure and oxidant mole fraction. Surface temperature measurements of the laser-ignited boron agglomerate during the ignition and combustion events will be carried out using a near-infrared, two-color pyrometer. In conjunction with the two-color pyrometer, a broadband radiometer is used to record the radiation emitted by the boron agglomerate. From the temporal outputs of the two-color pyrometer and the broadband radiometer, it is possible to determine the ignition temperature, the preignition delay time and the burning time of the boron agglomerate as function of ambient pressure and oxidant mole fraction. Boron slurries have a significant advantage over conventional jet fuels when evaluated on an energy-density basis. This project will provide experimental determination of boron particle agglomerate burning rates in the operating pressure range of one to 20 atm, typical of high-performance air- breathing engines.