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The Comparison of Spray Characteristics between FOOF and FOF Injectors used in Liquid Rockets  

임병직 (서울대학교 기계항공공학부)
정기훈 (서울대학교 기계항공공학부)
윤영빈 (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.7, no.2, 2003 , pp. 1-6 More about this Journal
Abstract
Triplet(FOF or OFO) injectors are commonly applied to liquid rockets which use LOX and hydrocarbon propellants. The FOF type injector has been known to have an advantage for the although to show lower combustion performance as compared by the OFO type. However, a large disparity between oxidizer and fuel orifice diameters of the FOF type injector may reduce both the combustion efficiency and stability so that as FOOF split triplet injector which splits a single oxidizer orifice into double orifices was designed. In the present study, spray characteristics of the FOOF injector were investigated and compared with those of the FOF injector undo. cold flow conditions. Mass distributions of oxidizer and fuel for both injectors were measured by using a PLLIF (Planar Liquid Laser Induced Fluorescence)technique, and each drop size was also measured by using an instantaneous photographic method. From the experimental results, we found out that FOOF shows more stable mixing efficiencies than the FOF. As for the drop size of both oxidizer and fuel, there was not a large difference between two injector types.
Keywords
Mixture ratio; FOF; FOOF; Momentum ratio; PLLIF; Mixing efficiency;
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