LES Analysis of Mixture Formation in a High-Speed Unsteady Hydrogen-Jet(Thermal Engineering)

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  • 高速非定常水素噴流における混合気形成過程のLES解析(熱工学,内燃機関,動力など)
  • 高速非定常水素噴流における混合気形成過程のLES解析
  • コウソク ヒテイジョウ スイソ フンリュウ ニ オケル コンゴウキケイセイ カテイ ノ LES カイセキ

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Abstract

Mixing process in a high-speed unsteady hydrogen jet is investigated by using large eddy simulation (LES) with the pseudo nozzle concept at inlet boundary. The results show that a jet shape of LES is similar to that of visualization image and the development of jet is well described in various injection coditions. Furthermore, the effects of injection condition such as injection pressure and nozzle diameter on mixture formation are investigated. As a result, low-injection pressure and small nozzle diameter promote mixing quickly, because the core region become small. And the effect of jet-fluid on mixing process is also investigated. As a result, the volume of entrainment is less and mixing inside jet is suppressed in case of hydrogen compared with methane in the same injection condition, because the density of hydrogen is much lower than the ambient air so the flow motion which promotes mixing inside jet quickly decreases when the air is entrained.

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