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The PIEZO injector, as 3-generation injector, can be operated from high pressure above 1800bar, It has a higher driven-efficiency than the existing solenoid-injector. Moreover the atomization of diesel fuel, that is injected by high pressure, can be improved in the engine cylinder. A fast response of needle is carried by the characteristics of piezo-electric actuator in PIEZO injector. In this study, a behavior analysis of the internal flow inside nozzle of PIEZO injector performed by the numerical method. The 3-D geometry for numerical model was considered by the central cross-section regarding of one injection hole. Also this geometry classified into the needle lift of 0.1㎜ and 0.2㎜mm with mini. sac volume boundary section, that has sharp edge and round edge, respectively. The computation test was applied with inlet pressure of injector of 400bar and 1300bar and the outlet pressure, that means back-pressure in combustion chamber, of 1 bar and 30bar. Firstly we obtained the basic data under steady state for PIEZO injector before application of moving-mesh. As a result, we found that the round edge appears a high velocity and pressure-drop. Also the obtained research results regarding of the verification of the basic model and simulation of fuel flow inside nozzle of PIEZO injector can be useful applicable the analysis for the moving mesh model.

목차

Abstract
1. 서론
2. 이론적 해석
3. 결과 및 분석
4. 피에조 인젝터의 분무특성
5. 결론
Acknowledgement
References

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UCI(KEPA) : I410-ECN-0101-2009-556-016555426