Spontaneous Ignition of n-Decane and n-Decane/Ethanol Isolated Droplets in Pressurized Hot Air
Abstract
Spontaneous ignition of isolated fuel droplets in hot ambient gas was experimentally studied under microgravity condition using the drop shaft in Toki, Japan. Ambient gas was air, and it was pressurized up to 1 MPa. Fuel was pure n-decane or n-decane/ethanol blended fuel. Droplet diameter was 1 mm. Gas-phase temperature near the droplet was measured by K-type thermocouples. The backlit droplet images and hot-flame behavior were also recorded. Ignition delays both of cool flame and of hot flame and typical temperatures of cool flame were evaluated from the thermocouple measurements. Vaporization rate and flame diameter were evaluated from the recorded video. The effect of the fuel composition on the evaluated outputs are examined and discussed.
- Publication:
-
38th COSPAR Scientific Assembly
- Pub Date:
- 2010
- Bibcode:
- 2010cosp...38.3597M