Heat release and UV–Vis radiation in non-premixed hydrogen–oxygen flames

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• 作者：Thomas Fiala ; Thomas Sattelmayer
• 刊名：Experiments in Fluids
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：56
• 期：7
• 全文大小：1,815 KB
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• 作者单位：Thomas Fiala (1)
  Thomas Sattelmayer (1)
  
  1. Lehrstuhl für Thermodynamik, Technische Universit?t München, Boltzmannstr. 15, 85747, Garching, Germany
  
• 刊物类别：Engineering
• 刊物主题：Engineering Fluid Dynamics
  Fluids
  Industrial Chemistry and Chemical Engineering
  Measurement Science and Instrumentation
  Thermodynamics
  Theoretical and Applied Mechanics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1114

文摘

The relationship between the volumetric heat release rate and radiation of non-premixed hydrogen–oxygen flames at atmospheric and elevated pressure is investigated. Both the radiation of the excited hydroxyl radical (\({\hbox {OH}^*}\)) and the continuous blue radiation are considered. To physically interpret radiation and heat release, the phenomena are first analyzed within laminar flames following a hybrid approach: a pressurized jet flame experiment is set up to correctly measure the \({\hbox {OH}^*}\) and blue radiation. The heat release rate is obtained from a complementary CFD simulation. Radiation and heat release are clearly uncorrelated for changes in pressure. Spatially, radiation and heat release occur at separate locations. To further scrutinize the laminar flame structure, non-premixed counterflow flame simulations are performed. By considering statistical ensembles of flamelets, these findings are transferred onto turbulent flames. As before, no general direct proportionality between radiation and heat release rate is observed because of flame straining. A technique for correcting these effects is applied, and its potential is evaluated. The impact of self-absorption of \({\hbox {OH}^*}\) radiation at elevated pressures on its interpretation is discussed.