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서지반출
IMPROVING THE PREDICTIVENESS OF THE QUASI-D COMBUSTION MODEL FOR SPARK IGNITION ENGINES WITH FLEXIBLE INTAKE SYSTEMS
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  • IMPROVING THE PREDICTIVENESS OF THE QUASI-D COMBUSTION MODEL FOR SPARK IGNITION ENGINES WITH FLEXIBLE INTAKE SYSTEMS
  • IMPROVING THE PREDICTIVENESS OF THE QUASI-D COMBUSTION MODEL FOR SPARK IGNITION ENGINES WITH FLEXIBLE INTAKE SYSTEMS
저자명
Lee. T.K.,Filipi. Z.S.
간행물명
International journal of automotive technology
권/호정보
2011년|12권 1호|pp.1-9 (9 pages)
발행정보
한국자동차공학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Fast and predictive simulation tools are prerequisites for pursuing simulation based engine control development. A particularly attractive tradeoff between speed and fidelity is achieved with a co-simulation approach that marries a commercial gas dynamic code $WAVE^{TM}$ with an in-house quasi-dimensional combustion model. Gas dynamics are critical for predicting the effect of wave action in intake and exhaust systems, while the quasi-D turbulent flame entrainment model provides sensitivity to variations of composition and turbulence in the cylinder. This paper proposes a calibration procedure for such a tool that maximizes its range of validity and therefore achieves a fully predictive combustion model for the analysis of a high degree of freedom (HDOF) engines. Inclusion of a charge motion control device in the intake runner presented a particular challenge, since anything altering the flow upstream of the intake valve remains "invisible" to the zero-D turbulence model applied to the cylinder control volume. The solution is based on the use of turbulence multiplier and scheduling of its value. Consequently, proposed calibration procedure considers two scalar variables (dissipation constant $C_{eta}$ and turbulence multiplier $C_M$), and the refinements of flame front area maps to capture details of the spark-plug design, i.e. the actual distance between the spark and the surface of the cylinder head. The procedure is demonstrated using an SI engine system with dual-independent cam phasing and charge motion control valves (CMCV) in the intake runner. A limited number of iterations led to convergence, thanks to a small number of adjustable constants. After calibrating constants at the reference operating point, the predictions are validated for a range of engine speeds, loads and residual fractions.