To understand the effect of high pressure on nitrogen oxides (NOx) formation in water added methane flames, opposed nonpremixed Water-methane/air (H2O-CH4/air) flames are numerically studied with high initial pressure. With GRI 3.0 detailed kinetic mechanism, NOx emissions are predicted for various strain rates. Due to high pressure, the chemical species are distributed in a narrow region, which means the thickness of the flame is thin. This can be clearly seen with high strain rate. Elevated pressure increases maximum temperature of flames which results in increased NOx emission. Even with elevated initial pressure, NOx emissions for H2O added methane flames are significantly decreased compare to pure methane flame. In addition, increased strain rate is also significant factor for decreasing NOx emission. With detailed rate of production analysis, in case of high pressure, it is confirmed that NO2 pathway is the most dominant reaction pathway than any other pathways.

ABSTRACT
 1. 서 론
 2. 연구 방법
  2.1 지배방정식
  2.2 계산 방법
 3. 결과 및 분석
  3.1 물 첨가율과 스트레인율에 따른 NOx 분포
  3.2 NOx 생성률와 배출지수
 4. 결 론
 References

• 금성민(Halla University, School of Mechanical and Automotive Engineering) | Sung-Min Kum
• 이승로(Chonbuk National University, Department of Mechanical Engineering) | Seungro Lee Corresponding Author