한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제22권6호
  • /
  • Pages.56-63
  • /
  • 2018
  • /
  • 1226-6027(pISSN)
  • /
  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
권호 표지
DOI QR코드

DOI QR Code

저선회 연소기의 입구 속도에 따른 비반응 유동구조 분석

Non-Reacting Flow Structure of a Low Swirl Combustor with respect to Inlet Velocities

  • Jeong, Hwanghui (School of Mechanical Engineering, Gwangju Institute of Science and Technology) ;
  • Lee, Bok Jik (School of Mechanical Engineering, Gwangju Institute of Science and Technology) ;
  • Lee, Keeman (School of Aerospace and Mechanical Engineering, Sunchon National University)
  • 투고 : 2018.06.24
  • 심사 : 2018.09.07
  • 발행 : 2018.12.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

저선회 연소기에서는 노즐출구의 속도장과 예혼합화염의 전파속도 간 균형에 의해 화염이 부상되어 존재한다. 저선회 화염의 부상높이에 대한 이해는 연소기의 안정성 및 노즐팁의 열화와 관련하여 중요한 문제이다. 이전의 실험적 연구로부터 입구 속도의 증가에 따라 화염부상높이가 오히려 감소하는 현상이 관찰된 바 있다. 선회익을 통과하는 환형 유동과 난류생성판을 통과하는 중심유동 간의 복잡한 유동장을 규명하기 위하여, 입구 속도를 바꾸어가며 비반응 유동장에 대한 수치해석을 수행하였다. 입구 속도에 따른 노즐 출구에서의 유동구조를 분석하여 실험에서 관찰된 비직관적 경향에 대한 정성적 설명을 도출하였다.

In low swirl combustors the flame is lifted above the nozzle to achieve balance between the flame speed and velocity field at the exit of the nozzle. Characterization of the flame liftoff height is important because it affects the stability of the combustor and degradation of the nozzle material. In experiments, a counter-intuitive trend of flame liftoff heights with respect to inlet velocities was observed. To elucidate the complicated flow field in a low swirl combustor having swirl vanes and a turbulence generator, a series of numerical simulations of non-reacting flows was conducted by varying the inlet velocity. The flow structures at the exit of the nozzle with respect to the inlet velocities are investigated to support the observation in the experiments.

키워드

참고문헌

  1. Park, T.J., Hwang, C.H. and Lee, K., "Development of Hydrogen/Dual Jet Combustor for a MGT(Part I: Experimental Study on Geometric Optimization)," Journal of the Korean Society of Propulsion Engineers, Vol. 17, No. 5, pp. 60-69, 2013. https://doi.org/10.6108/KSPE.2013.17.5.060
  2. Jang, M. and Lee, K., "A Study of Combustion Instability Mode according to the Variation of Combustor Length in Dual Swirl Gas Turbine Model Combustor," Journal of The Korean Society of Combustion, Vol. 21, No. 2, pp. 29-37, 2016. https://doi.org/10.15231/jksc.2016.21.2.029
  3. Kim, T.H., Kim, S.D., Jin, Y.I. and Min, S.K., "Effects of Flare Angle in Counter-Roataing Swirler on Swirling Flow," Journal of The Korean Society of Combustion, Vol. 21, No. 1, pp. 31-37, 2016. https://doi.org/10.15231/jksc.2016.21.1.031
  4. Kim, L., Hong, J.S., Jeong, W.C., Yoo, K.H., Kim, J.C. and Sung, H.G., "Turbulent Combustion characteristics of a Swirl Injector in a Gas Turbine Annular Combustor Using LES and Level-set Flamelet," Journal of the Korean Society of Propulsion Engineers, Vol. 18, No. 2, pp. 1-9, 2014. https://doi.org/10.6108/KSPE.2014.18.2.001
  5. Cheng, R.K., "Velocity and Scalar Characteristics of Premixed Turbulent Flames Stabilized by Weak Swirl," Combustion and Flame, Vol. 101, No. 1-2, pp. 1-14, 1995. https://doi.org/10.1016/0010-2180(94)00196-Y
  6. Cheng, R.K., Yegian, D.T., Miyasato, M.M., Samuelsen, G.S., Benson, C.E., Pellizzari, R. and Lofus, P., "Scaling and Development of Low-Swirl Burners Low Emission Furnaces and Boilers," Proceedings of the Combustion Institute, Vol. 28, No. 1, pp. 1305-1313, 2000. https://doi.org/10.1016/S0082-0784(00)80344-6
  7. Plessing, T., Kortschik, C., Peters, N., Mansour, M.S. and Cheng, R.K., "Measurements of the Turbulent Burning Velocity and the Structure of Premixed Flames on a Low-Swirl Burner," Proceedings of the Combustion Institute, Vol. 28, No. 1, pp. 359-366, 2000. https://doi.org/10.1016/S0082-0784(00)80231-3
  8. Jeong, H. and Lee, K., "Effect of Swirl Angles and Combustion Characteristics of Low Swirl Model Combustor," Journal of the Korean Society of Propulsion Engineers, Vol. 20, No. 4, pp. 40-49, 2016. https://doi.org/10.6108/KSPE.2016.20.4.040
  9. Jeong, H., Han, M.S., Kang, K., Lee, Y. and Lee, K., "An Experimental Study on the Effect of a Turbulence Generating Plate in Low Swirl Combustor," Journal of Mechanical Science and Technology, Vol. 31, No. 12, pp. 6077-6084, 2017. https://doi.org/10.1007/s12206-017-1152-7
  10. Jeong, H., Kang, K. and Lee, K., "A Study on the Combustion Characteristics with Hydrogen Contents of SNG Fuel in Low-Swirl Combustor," Transactions of the Korean Hydrogen and New Energy Society, Vol. 28, No. 2, pp. 181-189, 2017. https://doi.org/10.7316/KHNES.2017.28.2.181
  11. Jeong, H., Lee, B.J., Han, M.S. and Lee, K., "A Study on the Flame Liftoff Height in a Lean-Premixed Low Swirl Combustor," Journal of The Korean Society of Combustion, Vol. 23, No. 3, pp. 36-42, 2018. https://doi.org/10.15231/jksc.2018.23.3.036
  12. Weller, H.G., Tabor. G., Jasak, H. and Fureby, C., "A tensorial approach to computational continuum mechanics using object-oriented techniques," Computers in Physics, Vol. 12, No. 6, pp. 620-631, 1998. https://doi.org/10.1063/1.168744
  13. Yochizawa, A. and Horiuti, K., "A Statistically-Derived Subgrid-Scale Kinetic Energy Model for the Large-Eddy Simulation of Turbulent Flows," Journal of the Physical Society of Japan, Vol. 54, No. 8, pp. 2834-2839, 1985. https://doi.org/10.1143/JPSJ.54.2834
  14. Sohankar, A., Davidson, L. and Norberg, C., "A Dynamic One-Equation Subgrid Model for Simulaion of Flow around a Square Cylinder," Engineering Turbulence Modelling and Experiments 4, pp. 227-236, 1999.