Engine Systems Laboratory, Kyushu University
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Study on Vaporization, Spontaneous Ignition and Combustion of Fuel Sprays
Liquid fuels such as kerosene and light oil are utilized in many combustors in a form of spray combustion. Spray combustion is very complex because its process contains vaporization besides fuel/oxidizer mixing and chemical reactions. In this research, vaporization, spontaneous ignition and combustion of each droplet are experimentally and numerically studied as the simplified model of a spray. The numerical model is further developed to predict vaporization rate, ignition timing and heat release rate history of sprays of commercial fuels under high pressure relevant to commercial combustors.

Flame around an fuel droplet suspended on SiC fibers, which sponataneously ignited in high-temperature air
(pressure: 1.0 MPa, fuel: n-decane, droplet diameter: 1 mm, air temperature: 595 K, in microgravity.)

Temperature histories near a spontaneously igniting fuel droplet in high-temperature air (measured by K-type thermocouples)
(pressure: 0.3 MPa, fuel: n-decane, droplet diameter: 1 mm, air temperature: 620 K, in microgravity.
Cool flame was deteted before hot-flame appearance.)