Ignition of fuel films behind shock waves in air and oxygen

✍ Scribed by A.A. Borisov; S.M. Kogarko; A.V. Lyubimov

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 265 KB
• Volume: 12
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(68)90059-x

✦ Synopsis

The interaction ~,f ~seous sbock and detonation waves with liquid layer~ has been studied in a shock tube in order to elucidate the i~Jitian mechanism in heterogeneous systems consisting of a liquid fuel film and a gaseous oxidizer. It was shown t~'~tt after passage of the shock front over the liquid surface, the liquid/gas interface became hydro ~ dynamically uttslable (the Kelvin-Hclmholtz instability). The liquid layer became detached from the tube wall and formed a tl,Jn spray in the shocked 8as with the droplets having an average size or about I t~re. The ignition of very thin ~tane films in reflected shock waves was deterr.fined ma{nly by spray formation in a heated gaseaus flow and by the sul'A',equent evaporation and oxidation of the fuel droplets. The ignition delays decreased rapidly with increasing ~hock-wave intensity, but their temperature dependence, unlike the Arrhcaius equation for homogeneous mixtures, was nut exponential. The minimum shock strengths necessary to ignite cetane films in air and oxygen was determined.