Volume 38 Issue 4
Jul.  2018
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YUAN Hongliang, KONG Wenjun. Soot Formation in Laminar Diffusion Flame under Microgravityormalsize[J]. Journal of Space Science, 2018, 38(4): 517-523. doi: 10.11728/cjss2018.04.517
Citation: YUAN Hongliang, KONG Wenjun. Soot Formation in Laminar Diffusion Flame under Microgravityormalsize[J]. Journal of Space Science, 2018, 38(4): 517-523. doi: 10.11728/cjss2018.04.517

Soot Formation in Laminar Diffusion Flame under Microgravityormalsize

doi: 10.11728/cjss2018.04.517
  • Received Date: 2017-08-22
  • Rev Recd Date: 2018-05-17
  • Publish Date: 2018-07-15
  • The soot formation in a coflow ethylene/air laminar flame at 1g/0g (normal gravity and zero gravity) has been studied using particular fuel oxidation and PAH mechanism. The nucleation process is regarded as the dimerization of two large PAH, and HACA mechanism is used to describe the surface growth process. The collision of soot and PAH is mainly taken into account for the condensation process in soot surface. The initial nucleation, soot surface growth, condensation and oxidation are simulated with a discrete sectional aerosol model to capture the different size soot with different mass. The calculating results show that the peak temperature of the flame at 0g decrease by 230K, whereas the peak soot volume fraction is nearly twice larger than that of the 1g condition. This paper also studied the distribution of precursors (C2H2 and PAH), nucleation rate, surface growth rate, and condensation rate under microgravity. It is indicated that the condensation is the major process of soot formation in the centerline of flame for both 1g and 0g conditions, and it plays a more important role under microgravity. The average diameter of soot is lager due to long residence time under microgravity.

     

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