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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 Symposium 한국자동차공학회 2001년 심포지움(PROCEEDINGS OF BUSAN ENGINE INTERNATIONAL)
발행연도
2001.12
수록면
213 - 219 (7page)

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A fiber-optic heterodyne interferometry system was developed to obtain the temperature histories of an unburned mixture with high temporal resolution non-intrusively. In laser interferometry, the effective optical path length of the test beam changes with the gas density and corresponding changes of the refractive index. Therefore, the temperature history of an unburned gas can be determined from the pressure and phase shift of the heterodyne signal. A polarization-preserving fiber is used to deliver the lest beam to and from the test section, to improve the feasibility of the system as a sensor probe. The temperature of the unburned mixture in the end-gas region of a constant volume combustion chamber and in an engine cylinder was measured during flame propagation. The accuracy of the measurements and the feasibility of this system are discussed. The measurement accuracy of our system was sufficient to be applied to temperature history measurement of an unburned gas compressed by flame propagation in a constant-volume combustion chamber. The uncertainly of this method is within ±10 K. The resolution of the temperature measurement is approximately 0.5 K, and is dependent on both the sampling clock speed of the A/D converter and the length of the test section. This fiber-optic heterodyne interferometry system can also be used for other applications that require a transient temperature with a fast response time.

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Abstract

1.Introduction

2.Experimental Method and Procedure

3.Transient Temperature of Unburned Gas Compressed by Flame Development in a Constant-Volume Vessel

4.Measurement Accuracy

5.Temperature Measurement of Unburned End-Gas in an Engine Cylinder during Flame Propagation

6.Conclusions

References

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