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Effect of Elavated-Pressure and Radiative Heat Loss on Rotating Counterflow Twin Flame

  • UEMICHI Akane
    Department of Mechanical Engineering, The Univertisy of Tokyo
  • OSAKI Yasuo
    Department of Engineering Mechanics and Energy, University of Tsukuba
  • NISHIOKA Makihito
    Department of Engineering Mechanics and Energy, University of Tsukuba

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  • 回転対向流双子火炎における圧力および輻射熱損失の影響
  • カイテン タイコウリュウ フタゴ カエン ニ オケル アツリョク オヨビ フクシャ ネツ ソンシツ ノ エイキョウ

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<p>The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated. The range of pressure is from 1 to 8 atm. We performed numerical simulations with and without radiative heat loss. The loss was evaluated by using an optically thin model, which does not consider reabsorption of radiative energy. Without radiation, the leanest extinction limits reached ultralean conditions; the higher the pressure is, the leaner the extinction limits are. On the other hand, with radiative heat loss, the leanest extinction limits are shifted to richer condition as the pressure becomes higher; above 2 atm, the leanest extinction limits cannot reach ultralean condition. The response curves of the flame temperature to the equivalence ratio are distorted when radiative heat loss is considered. Under high pressure, the flame thickness is thinner and the heat release rate is enhanced mainly because of the increase of gaseous density in the both cases of with and without radiation heat loss. However, the temperature behind the flame zone much decreases due to the radiative heat loss in the high pressure case. This is because of increments of partial pressures of the radiative species and the length of the residence time of fluid in the backflow region of burned gas.</p>



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