Home Books eBooks Journals References & Proceedings Authors, Editors, Reviewers A-Z Product Index Awards
ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

HOLOGRAPHIC INTERFEROMETRIC VISUALIZATION OF THE HIGH PRESSURE INJECTION OF MULTIPLE SUPERSONIC DIESEL FUEL JETS

H. H. Shi
Tohoku University, Sendai, Japan

K. Takayama
Shock Wave Research Center, Institute of Fluid Science, Tohoku University, Sendai, Japan

Y. Aoyagi
Hino Motors Ltd, Tokuo, Japan

H. Sugihara
Hino Motors Ltd, Tokuo, Japan

Abstract

Supersonic diesel fuel jets were generated by a compact gas gun. Using a metal piston as a momentum exchanger of impacting projectile, diesel fuel was injected into the atmosphere through a five-hole diesel injector. Diesel fuel was also injected through titanium alloy nozzles with single and double holes. Air shock wave structure and jet shapes were visualized by a double exposure holographic interferometry. In the two-hole nozzle experiment, two supersonic fuel jets with a 30° diverging angle were produced. The shock-shock interaction and shock-jet interaction were examined. In the cases of two parallel supersonic jets and two opposed supersonic jets, merger and liquid fragmentation appeared. In the injection, the jet-jet interaction created complicated multi-shock-waves around the fuel jet. A pressure chamber coupled with a PVDF (Polyvinylidendifluorid) pressure gauge was designed for measuring the pressure inside nozzles caused by the metal piston compression after the primary impact of a projectile. The high frequency response pressure gauge recorded the structure of the pressure wave with a peak pressure value of about 140 MPa.