Counterflow diffusion flames of general fluids: Oxygen/hydrogen mixtures

Guillaume Ribert, Nan Zong, Vigor Yang, Laetitia Pons, Nasser Darabiha, Sébastien Candel

研究成果: Conference contribution

2 引文 斯高帕斯(Scopus)

摘要

A comprehensive framework has been established to study laminar counterflow diffusion flames for general fluids over the entire regime of thermodynamic states. The model incorporates a unified treatment of fundamental thermodynamics and transport theories into an existing model, the DMCF code, for treating detailed chemical kinetic mechanisms and multi-species transport. The resultant scheme can thus be applied to fluids at any state. Both subcritical and supercritical conditions are considered. As a specific example, diluted and undiluted H2/O2 flames are investigated at pressures of 1-250 atm and oxygen inlet temperatures of 100 and 300 K. The effects of pressure p and strain rate a on the energy release rate q̇s, extinction limit, and flame structure are examined. In addition, the impact of cross-diffusion terms, such as the Soret and Dufour effects, on the flame behavior is assessed. Results indicate that the flame thickness δ and heat release rate correlate well with the square root of the pressure multiplied by the strain rate as δf ∼/√pa and q̇s ∼ √pa. The extinction strain rate exhibits a quasi-linear dependence with p. Significant real-fluid effects take place in the transcritical regimes, as evidenced by the rapid property variations in the local flowfield. Their net influence on the flame properties, however, appears to be limited due to the ideal-gas behavior of fluids in the high-temperature zone.

原文English
主出版物標題Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
頁面16845-16858
頁數14
出版狀態Published - 2007
事件45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
持續時間: 2007 一月 82007 一月 11

出版系列

名字Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
24

Other

Other45th AIAA Aerospace Sciences Meeting 2007
國家/地區United States
城市Reno, NV
期間07-01-0807-01-11

All Science Journal Classification (ASJC) codes

  • 空間與行星科學
  • 航空工程

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