Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Study on Behavior of Spray and Spark Channel by Air Flow Characteristics According to Operating Conditions in Gasoline Direct Injection Engine

가솔린 직분사 엔진에서 운전 조건에 따른 공기 유동 특성에 의한 분무 거동 및 점화 채널에 관한 연구

  • 이호승 (한양대학교 대학원 융합기계공학과) ;
  • 박성욱 (한양대학교 기계공학부)
  • Received : 2023.12.06
  • Accepted : 2023.12.19
  • Published : 2023.12.31
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Abstract

In this study, visualization of in-cylinder spray behavior and spark channel stretching by air flow characteristics depending on engine operating conditions were investigated. For in-cylinder spray behavior, increase in engine rpm did not alter the counter-clockwise air flow direction and location of in-cylinder dominant air flow but increased average air flow velocity, which hindered spray propagation parallel to the piston surface. When injection timing was retarded, direction of in-cylinder dominant air flow was changed, and average air flow velocity was reduced resulting in an increase in spray penetration length and change in direction. For spark channel stretching, increase in air flow speed did not affect spark channel stretch direction but affected length due to increase in spark channel resistance and limitation of energy ignition coil can handle. Change in air flow direction affected spark channel stretch direction where the air flow was obstructed by ground electrode which caused spark channel direction to occur in the opposing direction of air flow. It also affected spark channel stretch length due to change in air flow speed around the spark plug electrode from the interaction between the air flow and ground electrode.

Keywords

Acknowledgement

이 연구는 2023년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원을 받아 수행한 연구 과제입니다('No. 20018492').

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