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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 한국자동차공학회논문집 자동차공학회논문집 제5권 제5호
발행연도
1997.9
수록면
51 - 66 (16page)

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A heat transfer model of the intake valve in a spark ignition engine is presented, which is cali-brated with a number of the valve temperature profiles measured druing engine warm-up for the gaseous fuel(propane). The valve is divided into four identical elements for which the assumption of lumped thermal mass is applied. The calibration is made so that the difference between the measured and simulated valve temperatures becomes minimal. Then, the model is applied to the cases of the liquid fuel(indolene) to estimate the amount of the liquid fuel vaporized from the in. take valve by assuming that fuel evaporation accounts for the deficit of the heat balance budget. The results of the model show quantitative contribution of each heat transfer source to the heat bal-The behavior of the calculated mass fraction of the fuel vaporized from the intake valve ex-plains how the liquid fuel evaporates during engine warm-up, indicating the important role of the intake valve during the early stage of engine warm-up. The mass fraction at warmed-up condi-tions is closely related with the fraction directly targeted on the valve back by the fuel spray geom-etry.

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ABSTRACT

1.Introduction

2.Heat Transfer Modeling

3.Experiment

4.Determination of Heat Transfer Coefficients

5.Calculation of Mass Flow Rates and Gas Temperature

6.Calibration of the Heat Balance Equa-tion

7.Application of the Calibrated Heat Bal-ance Equation to the Liquid Fuel Cases

8.Factors Affecting the Accuracy of the Mass Fraction Vaporized, _X evap

9.Results of Heat Balance

10.Physical Interpretation of the Mass Fration Vaporized, _X evap

11.Condusions

References

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