• Title/Summary/Keyword: 희석공

Search Result 535, Processing Time 0.031 seconds

Experimental Study on Combustion Performances with Variations in Main Air-ratio and Dilution hole-pattern (주연소 영역 공기배분 및 희석공기공 배치에 따른 연소 성능 변화 연구)

  • Kim, Minkuk;Kim, Hanseok;Jung, Seungchai;Park, Heeho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2017.05a
    • /
    • pp.254-257
    • /
    • 2017

  • As a part of the development of aircraft gas turbines, combustion performance tests have been conducted in the single combustor sector. The effects of change in the amount of air supplied to the main combustion zone to the performance of the combustor, such as a pollutant emission, a liner temperature distribution and an exit temperature patterns, were studied. Emissions of CO and NOx increased with the main air-ratio and exit temperature pattern was improved. When changing the pattern of the dilution holes, it was shown that the temperature patterns on the exit plane of the combustor and the surface of liner changed depending on the main flame structure and mixing with diluent air. These observations will be applied to combustor liner designs to improve combustor durability and emissions reduction performance.

  • PDF

Effect of $CO_2$ dilution on Combustion Instabilities in dual premixed flame (이중 예혼합화염에서 $CO_2$ 희석이 연소불안정에 미치는 영향)

  • Lee, Kang-Yeop;Kim, Hyung-Mo;Park, Poo-Min;Hwang, O-Sik;Yang, Soo-Seok;Ko, Young-Sung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2011.11a
    • /
    • pp.763-768
    • /
    • 2011

  • The effects of $CO_2$-dilution on combustion instability were studied in order to apply biogas in a dual lean premixed gas turbine combustor on a real-scale dual lean premixed burner head which is originally developed for Natural Gas fuel. Combustion instability is reduced by $CO_2$ dilution effect according to the result of dynamic pressure signal and phase-resolved $OH^*$ images. The reason for this is that dilution of $CO_2$ reduces heat release perturbation and increases flame volume due to reduction of the flame speed and expansion of flame surface.

  • PDF

Nitrogen Dilution Effects on Liftoff Flame Stability in Non-premixed Turbulent Hydrogen Jet with Coaxial Air (질소희석이 부상된 수소 난류확산화염의 화염안정성에 미치는 영향)

  • Oh, Jeong-Seog;Yoon, Young-Bin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2008.11a
    • /
    • pp.393-396
    • /
    • 2008

  • The study of nitrogen dilution effect on flame stability was experimentally investigated in non-premixed turbulent lifted hydrogen jet with coaxial air. hydrogen gas was used as a fuel and coaxial air was injected to make flame liftoff. And both of the fuel jet and coaxial air velocity were fixed as $u_F$=200 m/s and $u_A$=16 m/s, while nitrogen diluents mole fraction was varied from 0 to 0.2. For the analysis of flame structure and flame stabilization mechanism, the simultaneous measurement of PIV/OH PLIF had been performed. It was found that the turbulent flame propagation velocity increased as decreasing of nitrogen mole fraction. We concluded that the turbulent flame propagation velocity was expressed as a function of turbulent intensity, even though the mole fraction of nitrogen diluents gas was changed.

  • PDF