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자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 Symposium 한국자동차공학회 2001년 심포지움(PROCEEDINGS OF BUSAN ENGINE INTERNATIONAL)
발행연도
2001.12
수록면
197 - 204 (8page)

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The dilatation effect on turbulence kinetic energy was analyzed by experiments and calculations for a rapid compression-expansion machine. The theoretical of the k-ε two equation model has revealed that the turbulence characteristic time (=k-ε) at the beginning of compression is a key factor to whether the turbulence kinetic energy increases or decreases during compression. The result of numerical computations for a disk-shaped combustion chamber assuming a uniform turbulence field shows that the turbulence kinetic energy increases or decreases during compression when the initial turbulence characteristic time is longer or shorter, respectively, than a critical value. It is also shown that the critical value becomes smaller as an engine speed increases. To validate the theoretical finding, experiments and three, dimensional simulations were performed for a rapid compression, expansion machine, which was designed to generate a swirl motion or a tumble motion in a cylinder before compression at various turbulence strengths. The turbulence characteristic time was measured with a hot, wire anemometer in the initial steady-flow fields at various turbulence strengths. The results indicated that the turbulence characteristic time is shorter with increasing turbulence strength. This is explained by the fact that the measurements of integral length scale are almost unchanged under different strengths of turbulence and therefore the product of the turbulence characteristic time and the turbulence strength is kept almost constant. Measurements of turbulence kinetic energy during compression and expansion strokes were performed using a LDV. The experimental results show that the turbulence kinetic energy increases during a compression stroke when the initial value of turbulence characteristic time is longer than the critical value, validating the theoretical finding.

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Abstract

1.Introduction

2.A Key Factor to the Dilatation Effect

3.Experimental apparatus and Velocity Measurements

4.Governing Equations and a Method of Numerical Calculation

5.Measurements of Turbulence Characteristic Time at BDC

6.Measurements of Turbulence Kinetic Energy during Compression and Expansion Strokes

7.Computational Analysis in Consideration of the Non-Uniformity in the Turbulent Field

8.Conclusions

References

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