Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on Measurement of Laminar Burning Velocity and Markstein Length of SNG Fuel in Spherical Propagation Flame

구형 전파화염에서 SNG 연료의 층류연소속도와 마크스타인 길이 측정에 관한 연구

  • SONG, JUNHO (Department of Aerospace Engineering, Sunchon National University) ;
  • LEE, KEEMAN (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • 송준호 (순천대학교 우주항공공학과) ;
  • 이기만 (순천대학교 기계.우주공학부)
  • Received : 2018.12.27
  • Accepted : 2019.02.28
  • Published : 2019.02.28
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Abstract

An experimental study was conducted to measure laminar burning velocity and Markstein length of SNG fuel with 3% of hydrogen contents from spherical propagating flames at normal and elevated initial pressure. These results were compared with numerical calculations by Premix code with GRI-mech 3.0, USC II and UC San Diego to provide suitable mechanism for SNG fuel. As a result of this work, it was found that the burning velocities and Markstein lengths of SNG fuel decrease with increase of initial pressure regardless of equivalence ratio. In addition, numerical calculations with GRI-mech 3.0 were coincided with experimental results.

Keywords

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Fig. 1. Schematic diagram of experimental system

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Fig. 2. Stretched burning velocities of SNG/air as function of K at 0.1 MPa condition and 298 K: (a) Φ=0.8, (b) Φ=1.0, and (c) Φ=1.2

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Fig. 3. Effects of different models on extracted laminar burning velocities at 0.1 MPa condition and 298 K: (a) Φ=0.8, (b) Φ =1.0, and (c) Φ=1.2

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Fig. 4. Comparison of laminar burning velocities between experiments and calculations at 298 K: (a) P =0.1 MPa, (b) P=0.3 MPa, and (c) P =0.5 MPa

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Fig. 5. Experimental and numerical laminar burning velocities s function of Φ with different pressure condition at 298 K

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Fig. 6. Markstein lengths as function of equivalence ratio withdifferent pressure condition at 298 K

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Fig. 7. Schlieren images of SNG/air premixed flames at Φ=0.7 and 298 K (a) 0.5 MPa, (b) 0.1 MPa

Table 1. Experimental conditions

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Table 2. Average error in calculated laminar burning velocity of SNG with different mechanisms

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