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

研究启动奖：激光点燃 Baron 团聚体在高压下的点火和燃烧现象

• 批准号: 9011737
• 负责人: Ke Nguyen
• 金额: $ 8.63万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9011737&HistoricalAwards=false
• 关键词: Research; Initiation; Awards; Ignition; Combustion

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.

本研究的目的是研究环境压力对硼团聚体点火延迟时间和燃烧时间的影响。 在这项研究中，安装在高压燃烧室内的探针支撑的硼团聚体被 CO2 激光束点燃。 激光点火技术和高压燃烧室的使用将允许环境压力和氧化剂摩尔分数的变化。 将使用近红外双色高温计对点火和燃烧过程中激光点火的硼团聚体的表面温度进行测量。 与双色高温计结合使用宽带辐射计来记录硼团聚体发出的辐射。 根据双色高温计和宽带辐射计的时间输出，可以确定作为环境压力和氧化剂摩尔分数的函数的硼团聚体的点火温度、预点火延迟时间和燃烧时间。 根据能量密度进行评估时，硼浆料比传统喷气燃料具有显着优势。 该项目将在 1 至 20 个大气压（高性能呼吸式发动机的典型工作压力）范围内对硼颗粒团聚体燃烧速率进行实验测定。