Some Effects of Hydrogen Self-Ignition and Combustion in Supersonic Flow

Authors

  • U. Zhapbasbayev al-Farabi Kazakh National University, 050038, al-Farabi av. 72, Almaty, Kazakhstan
  • V. Zabaykin Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 630090 Novosibirsk, Russia
  • Y. Makashev al-Farabi Kazakh National University, 050038 Al-Farabi av. 71, Almaty, Kazakhstan
  • A. Tursynbay al-Farabi Kazakh National University, 050038, al-Farabi av. 72, Almaty, Kazakhstan
  • B. Urmashev al-Farabi Kazakh National University, 050038, al-Farabi av. 72, Almaty, Kazakhstan

DOI:

https://doi.org/10.18321/ectj188

Abstract

Results are presented of computational and experimental investigations of the influence of temperature and flow composition on the hydrogen combustion kinetics for a coaxial fuel supersonic flow. Depending on the flow parameters, combustion is shown to occur with an intense heat release governed by the speed of chemical reactions, or a diffusion combustion with heat release governed by mixing. The computational results are in good agreements of with laboratory data and portrays many important features of supersonic combustion. The influence of the gas temperature and composition on the diffusion combustion of a circular hydrogen jet in supersonic coaxial flow at the over expanded exhaust regimes is investigated. It is found that at low flow temperatures (Т2 ~ 900 K) and in the absence of water vapors in the oxidizer gas composition, the speed of chemical reactions is the determining factor for combustion. An increase in the flow temperature (Т2 > 1200 K) causes a reduction of the induction time of the reactive mixture, because the mixing of fuel with oxidizer decreases, and a “sluggish” diffusion combustion of non-mixed gases is observed. The presence of water vapor and active radicals in the gas ensures the self-ignition from the start of the mixing, and the diffusion combustion mode is limited by mixing of the hydrogen jet with the coaxial flow (similar to the case with high initial temperatures of the air stream). In the case of the delay combustion process the maximum pressure level on the wall is 10% more than that in the combustion mode with ignition at the start of mixing. A sluggish combustion regime may lead to an incomplete hydrogen burnout.

 

 

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Published

2014-09-30

How to Cite

Zhapbasbayev, U., Zabaykin, V., Makashev, Y., Tursynbay, A., & Urmashev, B. (2014). Some Effects of Hydrogen Self-Ignition and Combustion in Supersonic Flow. Eurasian Chemico-Technological Journal, 16(2-3), 245–253. https://doi.org/10.18321/ectj188

Issue

Vol. 16 No. 2-3 (2014)

Section

Articles

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