Volume 38 Issue 6
Nov.  2018
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CUI Yanling, WANG Baorui, YUAN Hongliang, KONG Wenjun. Effects of Laser and Hot Wire Modes on Ignition and Combustion of Single Multicomponent Droplet[J]. Chinese Journal of Space Science, 2018, 38(6): 900-908. doi: 10.11728/cjss2018.06.900
Citation: CUI Yanling, WANG Baorui, YUAN Hongliang, KONG Wenjun. Effects of Laser and Hot Wire Modes on Ignition and Combustion of Single Multicomponent Droplet[J]. Chinese Journal of Space Science, 2018, 38(6): 900-908. doi: 10.11728/cjss2018.06.900

Effects of Laser and Hot Wire Modes on Ignition and Combustion of Single Multicomponent Droplet

doi: 10.11728/cjss2018.06.900
  • Received Date: 2018-04-20
  • Rev Recd Date: 2018-06-20
  • Publish Date: 2018-11-15
  • The ignition and combustion characteristics of multicomponent fuel as single suspended droplet are conducted. The effects of laser and hot wire ignition on droplet burning rate, flame morphology and ignition delay time are analyzed. The experimental results show that, as the hot wire ignition time increases, the burning rate increases with the increase of natural convection around the droplet. Under ambient environment, the droplet flame is a teardrop shaped flame, and the maximum ratio between the flame height and the initial droplet diameter is about 18. When t/tb>0.4, the flame height of the droplet when heated by the hot wire is 5D0 higher than that in subsequent non-heating stage, and 5~10D0 higher than that of the droplet ignited by the laser. Compared with the hot wire ignition, the laser ignition responses faster and causes less interference to the flow field near the droplet. Therefore, the laser ignition is an ideal method of the droplet combustion experiments on the ground. With a fixed laser pulse time, the ignition delay time of single droplet becomes shorter when the laser intensity increases.

     

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