Multiple pulsed hypersonic liquid diesel fuel jetsdriven by projectile impact

K. Pianthong, K. Takayama, B. E. Milton, M. Behnia

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Further studies on high-speed liquid diesel fuel jets injected into ambient air conditions have been carried out. Projectile impact has been used as the driving mechanism. A vertical two-stage light gas gun was used as a launcher to provide the high-speed impact. This paper describes the experimental technique and visualization methods that provided a rapid series of jet images in the one shot. A high-speed video camera (106 fps) and shadowgraph optical system were used to obtain visualization. Very interesting and unique phenomena have been discovered and confirmed in this study. These are that multiple high frequency jet pulses are generated within the duration of a single shot impact. The associated multiple jet shock waves have been clearly captured. This characteristic consistently occurs with the smaller conical angle, straight cone nozzles but not with those with a very wide cone angle or curved nozzle profile. An instantaneous jet tip velocity of 2680 m/s (Mach number of 7.86) was the maximum obtained with the 40 \circs nozzle. However, this jet tip velocity can only be sustained for a few microseconds as attenuation is very rapid.

Original languageEnglish
Pages (from-to)73-82
Number of pages10
JournalShock Waves
Volume14
Issue number1-2
DOIs
Publication statusPublished - Jun 2005
Externally publishedYes

Keywords

  • Hypersonic diesel fuel jets
  • Jet shock wave
  • Multiple pulsed jet

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