Evaluation of cavitation in injector nozzle and correlation with liquid atomization
Tóm tắt
Present paper describes the correlation between occurrence of cavitation inside injector nozzle and progress of atomization in discharged liquid jet flow. A transparent two-dimensional shape nozzle was designed and it was used for flow visualization. The visualized images both of cavitation and atomization were obtained simultaneously. The cavitation was evaluated by applying image analysis. The quantitative analysis on length, thickness and their fluctuations of cavitation was made, and the correlation with atomization was examined. The authors proposed an evaluation method of atomization in the previous study, and it was combined with evaluation method of cavitation developed in this study. It is found that the change of cavitation and progress of atomization are synchronized, and that a strong correlation between them exists. The best performance of atomization may be obtained by controlling the cavitation inside nozzle, and obtained aspects with this study will be utilized for the design of fuel injection nozzle of internal combustion engines.
Tài liệu tham khảo
Akayama D, Nishio S, Sou A (2013) Evaluation of liquid jet flow by means of image analysis. J Vis Image Process 20:47–64
Andriotis A, Gavaises M, Arcoumanis C (2008) Vortex flow and cavitation in diesel injector nozzles. J Fluid Mech 610:195–215
Bergwerk W (1959) Flow pattern in diesel nozzle spray holes. Proc Inst Mech Eng 173:655–660
Chaves H, Knapp M, Kubitzek A, Obermeier F, Schneider T (1995) Experimental study of cavitation in the nozzle hole of diesel injectors using transparent nozzles. Society of automotive engineers technical paper, No. 950290, pp 645–657
Hayashi T, Suzuki M, Ikemoto M (2012) Visualization of internal flow and spray formation with real size diesel nozzle. In: 12th triennial international conference on liquid atomization and spray systems. Heidelberg, Germany
Henry ME, Collicott SH (2000) Visualization of internal flow in a cavitating slot orifice. At Sprays 10:545–563
Hiroyasu H, Arai M, Shimizu M (1991) Break-up length of liquid jet and internal flow in a nozzle. In: Proceeding of international conference on liquid atomization and spray systems-91, pp 275–282
Miranda R, Chaves M, Martin U, Obermeier F (2003) Cavitation in a transparent real size VCO injection nozzle. In: Proceeding of international conference on liquid atomization and spray systems, Paper no. 12–6
Reitz RD, Bracco FV (1982) Mechanism of atomization of liquid jet. Phys Fluids 25(10):1730–1742
Soteriou C, Andrews R, Smith R (1995) Direct injection diesel sprays and the effect cavitation and hydraulic flip on atomization. Society of automotive engineers technical paper, No. 950080
Sou A, Hosokawa S, Tomiyama A (2007) Effects of cavitation in a nozzle on liquid jet atomization. Int J of Heat Mass Transf 50(17–18):3575–3582
Sou A, Maulana MI, Isozki K, Hosokawa S, Tomiyama A (2008) Effects of nozzle geometry on cavitation in nozzle of pressure atomization. J Fluid Sci Technol 3(5):622–632