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Diesel engines are widely used in the modern industrial fields. However, the government regulations for environments are becoming increasingly stringent and encompassing more types of vehicles, such as diesel engines. The after-treatment system is a effective method to reduce the exhaust emission with keeping high efficiency of engine. The Urea-SCR system is the effective solution to reduce NOx among them. The injected urea-solution is converted into ammonia by heating the exhaust gas, then the ammonia is mixed with an exhaust gas. NOx is reduced by chemical reaction of the mixture. However, the non-reacted ammonia passes through the SCR system without chemical reaction so that the ammonia slip takes place. Therefore the precise control of urea-solution injecting from the nozzle is major factor of the Urea-SCR system. The spatial concentration and distributions of the spray, which determines the performance of the nozzle, are major factor in the Urea-SCR system. In this work, the flow and spray characteristics of the two-fluid Urea-SCR spray nozzle were measured with an air and liquid ratio(ALR). The variation of injection quantities is dependent upon a duty ratio, supplying liquid pressure and air flow-rate. Particularly, the flow-rate of carrier air is very important factor to determine the injection quantities. In addition, the spray structure;spray angle, penetration were measured using a PIV system.

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1. 서론
2. 실험장치 및 방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-556-014614213