SC4-2: Imaging of the Flow and Cavitation Formation in a Transparent Real-Size Six-Hole Nozzle under Realistic Conditions(SC: Spray and Spray Combustion,General Session Papers)

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A novel experimental system has been developed in order to provide full access to the transient two-phase flow present inside a real-size transparent six-hole diesel injector nozzle. The purpose of this experiment is to investigate the formation and development of cavitation inside the sac volume and nozzle holes during an injection event as a function of geometric and operating parameters. A conventional common rail fuel injection system has been employed but whose metallic injector tip is replaced by a transparent section of identical geometric characteristics to those of the production nozzle. A CCD and an advanced high speed camera have been employed to record images of the in-nozzle flow in all holes during an injection event lasting about 4ms at a 250bar rail pressure within a VCO and a MiniSac nozzle. The obtained images of the cavitation patterns are compared with observations obtained previously at City University London using enlarged nozzle models of similar geometry as well as real-size nozzles but with optical access to only one of the holes. In this paper first the experimental setup is briefly described, which allows high quality images using the CCD camera as a function of the needle lift and operating conditions to be obtained, followed by an investigation of the transient flow using a high speed camera which is able to record 10000 frames per second at a 512X512 pixels resolution. Combination of the images from the two cameras with their complementary spatial and temporal resolutions, has provided very good understanding of the formation and development of both the geometric and string cavitation in the sac volume and the holes of production diesel injector nozzles.
2008-07-28

SC4-2: Imaging of the Flow and Cavitation Formation in a Transparent Real-Size Six-Hole Nozzle under Realistic Conditions(SC: Spray and Spray Combustion,General Session Papers)

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