An Experimental-Numerical Investigation of Unsteady Partially Premixed Flames

非稳态部分预混火焰的实验数值研究

• 批准号: 9707000
• 负责人: Ishwar Puri
• 金额: $ 29.6万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-10-01 至 2001-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9707000&HistoricalAwards=false
• 关键词: Experimental; Numerical; Investigation; Unsteady; Partially

Abstract - Puri This is an experimental and numerical investigation of transient effects on the structure and stability of partially premixed hydrocarbon-air flames. The dominant reaction pathways, and their dependence on the elvel of premixing, are identified for both steady and unsteady flames in both coflow and counterflow configurations. The effects of perturbing the inner layer through acoustic forcing of specified amplitude and frequency on the distributin of carbon monoxide and hydrogen as well as on the reaction rates of these species and the heat release rates are examined. Similarly, the effects of perturbing the outer layer on ignition and heat release are quantified. Parametric comparisons between sealar profiles and reaction rates in coflow and counterflow flames are performed. Experimental measurements include velocity, species, temperature measurements, and high-speed videography of flame unsteadiness.

本文对部分预混碳氢化合物-空气火焰的结构和稳定性的瞬变效应进行了实验和数值研究。对于同向流动和逆流结构中的稳定和非稳定火焰，确定了主要的反应路径及其对预混能级的依赖。研究了通过特定幅度和频率的声强迫来扰动内层对一氧化碳和氢的分布以及对这些物质的反应速率和放热速率的影响。类似地，对外层扰动对点火和放热的影响进行了量化。对同向流动和逆流火焰中的密封层分布和反应率进行了参数比较。实验测量包括速度、物种、温度测量和火焰不稳定的高速摄像。