Experimental and Theoretical Studies on the Structure of Highly Preheated Air Flames

以甲烷或丙烷为燃料，研究了在高度预热空气条件下火焰的结构。具体的问题包括火焰稳定性极限，火焰特征，火焰辐射和发射-吸附光谱，火焰温度，以及受空气预热温度，燃料和火焰等效比影响的火焰中的化学物质。实验设备使用一对蓄热式燃烧器，允许测试部分保持在高达1800(K)的任何温度；燃烧空气可以预热到1300(K)，比传统炉子的空气温度高得多。测试部分是光学可达的，允许使用许多光学诊断。高预热空气燃烧具有许多潜在的优点，但目前尚未被认为具有实用性。它可以减少高达30%的燃料消耗，减少二氧化碳排放，减少设备尺寸，并减少20-30%的污染物。本研究中使用的再循环系统可能是利用这些好处的实用方法。

Abstract-Gupta The structure of flames is examined under conditions of highly preheated air using methane or propane as the fuel. Specific matters of interest include flame stability limits, flame signature, flame radiation and emission-adsorption spectra, flame temperature, and chemical species within the flame as affected by air preheat temperature, fuel, and flame equivalence ratio. The experimental facility uses a pair of regenerative burners which allow the test section to be maintained at any temperature up to 1800( K; combustion air can be preheated up to 1300( K, giving a much higher air temperature than in conventional furnaces. The test section is optically accessible permitting the use of a number of optical diagnostics. Highly-preheated air combustion offers many potential advantages but has not been deemed practical up to now. It can reduce fuel consumption up to 30%, reduce carbon dioxide emissions, reduce equipment size, and reduce pollutants by 20-30% for a given therm production. The recirculating system used in this study may be a practical way to exploit these benefits.