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Effects of Orifice Internal Flow on Transverse Injection into Subsonic Crossflows  

김정훈 (서울대학교 기계항공공학부)
안규복 (서울대학교 기계항공공학부)
윤영빈 (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.7, no.1, 2003 , pp. 28-39 More about this Journal
Abstract
Effects of the orifice internal flow such as cavitation and hydraulic flip on transverse injection into subsonic crossflows have been studied. The liquid column breakup length and the liquid column trajectory were measured by changing the orifice diameter (d), the orifice length/orifice diameter (L/d), the injection pressure and the shapes (sharp and round) of orifice entrance, and were compared with previous results. It is found that cavitation bubbles, which occur inside the sharp-edged orifice, make the liquid jet very turbulent and especially in the orifices with L/d ＝ 5 hydraulic flip appear as cavitation bubbles are emitted from the orifice. The breakup length is shorter as cavitation bubbles grows and hydraulic flip appears. However, the liquid column trajectories normalized by the effective diameter and the effective momentum ratio have a similar tendency irrespective of cavitation and hydraulic flip.
Keywords
Transverse injection; Cavitation; Hydraulic flip; Liquid Column Breakup length; Liquid column trajectory;
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