대형 저속 2행정 디젤기관의 연소 특성 해석에 관한 연구

Abstract

Among the various technologies for emission reduction, The best selection of Fuel Atomizer is widely used as an economical and effective method to control emission and engine performance.

To provide an insight into the combustion characteristics according to atomizer geometry, Four atomizers type have been studied for a large low speed two-stroke diesel engine using FIRE CFD code. The measured cylinder pressure data and emission trends were good agreement with calculated data.

And heat flux calculation for combustion components is also performed and the result shows the similar trend with measurment temperature value. However, some injection and combustion model constants did need to be re-optimized to improve accuracy with the large low speed two-stroke diesel engine. The computational results celarly show that atomizer with mixed hole size and relatively larger injection area is more advantage than that of same hole diameter for NOx emission.

The results obtained in this simulation study further demonstrate that the CFD code can be used as an effective design tool for optimizing engine performance and emission, thereby saving a considerable amount of time and resources.