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    국내학술지 제목 게시판 내용
    제목(국문) 반 쐐기형 연소실을 채택한 SI기관에서 포트형상이 정상유동 특성에 미치는 영향(3) - 평가방법과 평가위치의 비교 -
    제목(영문)
    저자 현지혜 (Jihye Hyun ,서울과학기술대학교 대학원 기계공학과 박사과정 ) ▷공저자네트워크등록하기
    엄인용 (Inyong Ohm ,서울과학기술대학교 기계-자동차공학과 ) ▷공저자네트워크등록하기
    초록
    초록(영문)

    This paper reports on the third study worldwide on the steady flow characteristics considering the port
    shape in an SI engine with a semi-wedge combustion chamber. The evaluation methods of the impulse swirl
    meter (ISM) and the particle image velocimetry (PIV) are compared. A straight port and a helical port were
    applied to the combustion chamber and the swirl was evaluated with ISM and PIV from 1.75B, (1.75 times the
    bore position apart from the bottom of head), to 6.00B positions. The comparison showed that the ISM
    evaluation was higher than the PIV, and the ISM evaluation decreases as the measuring position shifts
    downstream regardless of the shape of the port. The decrease in the helical port was larger than that of the
    straight one. PIV evaluation also slightly increases to 3.00B regardless of port shape, and then decreases.
    However, as the evaluation position shifts downstream, the ISM assessment is significantly reduced though the
    decrease in the PIV assessment is relatively small, thereby reducing the difference between the two assessments.
    The significant reduction in swirl according to the assessment location in the ISM method is due to the increase
    in wall friction and the overestimation due to the assumption of the ISM evaluation in the upstream being
    resolved downstream by the flow development. When considering the steady flow characteristics and the flow of the actual engine at the same time, the position of 5.00-6.00B is suitable for consistent evaluation.

    keyword Steady Flow Bench, Semi-Wedge Combustion Chamber, Swirl Flow, Impulse Swirl Meter, PIV, Velocity Profile, Eccentricity, Straight Port, Helical Port
    저널명 대한기계학회논문집 B ▷관련저널보기
    VOL 42
    PAGE 0631
    발표년도 2018
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