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논문 기본 정보

자료유형
학술대회자료
저자정보
Hao Han (Yonsei University) Woong Sup Yoon (Yonsei University) Kwang Min Chun (Yonsei University)
저널정보
한국자동차공학회 한국자동차공학회 추계학술대회 및 전시회 2012년 한국자동차공학회 학술대회 및 전시회
발행연도
2012.11
수록면
494 - 501 (8page)

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초록· 키워드

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Urea-SCR, the selective catalytic reduction using urea as reducing agent, has been the most promising way to diminish NOx emissions originating from heavy duty vehicles. However, one of the shortcomings of Urea-SCR is NOx reduction performance degradation at low exhaust gas temperatures on account of ammonia slip and ammonia deposition. Therefore, in the present study, a new type of injection method is suggested which overcomes the shortcoming. The flashboiling atomization is one of the best means that improve the spray characteristics as finer droplets, shorter spray breakup length, and better distribution for enhancing the mixing of urea with exhaust gases. When liquid sheet is subjected to sufficient superheating (boiling) or pressure reduction (cavitation), it becomes formed bubbles. The subsequent growth of the bubbles drives the atomization process. In this experiment study, the injection temperature (dimensionless superheat degree) and crossflow temperature were varied. A high-speed photography technique and a laser-based optical technique (GSV, TSI Inc.) were used to characterize the breakup pattern and spray quality at the downstream of injection position. The spray breakup length and SMD distributions were measured as function of operating conditions. The experiment result proved that the atomization performance improved by flash-boiling swirl spray without being affected by exhaust gas temperatures.

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Abstract
1. INTRODUCTION
2. EXPERIMENTAL SETUP AND METHOD
3. RESULTS AND DISSCUSSION
4. CONCLUSION
References

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UCI(KEPA) : I410-ECN-0101-2014-556-000418202