논문 : 디젤 엔진의 인젝터 설계 변수가 노즐 코킹에 미치는 영향 분석
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영문초록
Recent common-rail injector of a diesel engine needs more smaller nozzle hole to meet the stringent emission regulation, But, small nozzle hole diameter can cause nozzle coking which is occurred due to the deposits of post-combustion products, Nozzle coking has a negative effect on the performance of fuel injector because it obstructs the fuel flow inside a nozzle hole, In this study DFSS (Design for six sigma) method was applied to find the effect of nozzle design parameter on nozzle coking, Total 9 injector samples were chosen and tested at diesel engine, The results show that nozzle hole diameter and K-factor have more effect on nozzle coking than A-mass and hole length. Large hole diameter and A-mass, small hole length and K-factor give more positive performance on nozzle coking in these experimental conditions. But, a performance about nozzle coking and exhaust gas emission shows the opposite tendency. More detail studies are needed to find the connection relation between nozzle coking and emission at the optimization work of injector nozzle development.
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