Experimental study on the laminar flame speed of hydrogen/natural gas/air mixtures

Abstract

Laminar flame speeds of hydrogen/natural gas/air mixtures have been measured over a full range of fuel compositions (0–100% volumetric fraction of H₂) and a wide range of equivalence ratio using Bunsen burner. High sensitivity scientific CCD camera is use to capture the image of laminar flame. The reaction zone area is employed to calculate the laminar flame speed. The initial temperature and pressure of fuel air mixtures are 293 K and 1 atm. The laminar flame speeds of hydrogen/air mixture and natural gas/air mixture reach their maximum values 2.933 and 0.374 m/s when equivalence ratios equal to 1.7 and 1.1, respectively. The laminar flame speeds of hydrogen/natural gas/air mixtures rise with the increase of volumetric fraction of hydrogen. Moreover, the increase in laminar flame speed as the volumetric fraction of hydrogen increases presents an exponential increasing trend versus volumetric fraction of hydrogen. Empirical formulas to calculate the laminar flame speeds of hydrogen, natural gas, and hydrogen/natural gas mixtures are also given. Using these formulas, the laminar flame speed at different hydrogen fractions and equivalence ratios can be calculated.

Key words： laminar flame speed; experimental study; Bunsen flame

Acknowledgments

This work was supported by the National Basic Research Program of China (No. 2005CB221206).

References

1 Zaporowski B, Szczerbowski R. Energy analysis of technological systems of natural gas fired combined heat-and-power plants. Applied Energy, 2003, 75(1-2): 43-50

2 Rousseau S, Lemoult B, Tazerout M. Combustion characteristics of natural gas in a lean burn spark-ignition engine. Proceedings of the Institution of Mechanical Engineers. Part D, Journal of Automobile Engineering, 1999, 213(5): 481-489

3 Blarigan P V, Keller J O. A hydrogen fueled internal combustion engine designed for single speed/power operation. International Journal of Hydrogen Energy, 1998, 23(7): 603-609

4 Akansu S O, Dulger Z, Kahraman N, Veziroglu T N. Internal combustion engines fuelled by natural gas-hydrogen mixtures. International Journal of Hydrogen Energy, 2004, 29(14): 1527-1539

5 Scholte T G, Vaags P B. Burning velocities of mixtures of hydrogen, carbon monoxide and methane with air. Combustion and Flame, 1959, 3: 511-524

6 Liu Y, Lenze B, Leuckel W. Investigation on the laminar and turbulent burning velocities of premixed lean and rich flames of methane-hydrogen-air mixtures. Prog Astronaut Aeronaut, 1991, 131: 259-274

7 Milton B E, Keck J C. Laminar burning velocities in stoichiometric hydrogen and hydrogen-hydrocarbon gas mixtures. Combustion and Flame, 1984, 58(1): 13-22

8 Yu G, Law C K, Wu C K. Laminar flame speed of hydrocarbon+ air mixtures with hydrogen addition. Combustion and Flame, 1986, 63(3): 339-347

9 Ren J Y, Qin W, Egolfopoulos F N, Tsotsis T T. Strain-rate effects on hydrogen-enhanced lean premixed combustion. Combustion and Flame, 2001, 124(4): 717-720

10 Ren J Y, Qin W, Egolfopoulos F N, Mak H, Tsotsis T T. Methane reforming and its potential effect on the efficiency and pollutant emissions of lean methane-air combustion. Chemical Engineering Science, 2001, 56(4): 1541-1549

11 Halter F, Chauveau C, Djebaïli-Chaumeix N, Gökalp I. DjebaIli-Chaumeix N, Gokalp I. Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane-hydrogen-air mixtures. Proceedings of the Combustion Institute, 2005, 30(1): 201-208

12 Law C K, Kwon O C. Effects of hydrocarbon substitution on atmospheric hydrogen-air flame propagation. International Journal of Hydrogen Energy, 2004, 29(8): 867-879

13 Miller D R, Evers R L, Skinner G B. Effects of various inhibitors on hydrogen-air flame speeds. Combustion and Flame, 1963, 7: 137-142

14 Huang Z H, Zhang Y, Zeng K, Liu B, Wang Q, Jiang D M. Measurements of laminar burning velocities for natural gas-hydrogen-air mixtures. Combustion and Flame, 2006, 146(1-2): 302-311

15 Law C K, Sung C J. Structure, aerodynamics, and geometry of premixed flamelets. Progress in Energy and Combustion Science, 2000, 26(4-6): 459-505

16 Natarajan J, Lieuwen T, Seitzman J. Laminar flame speeds of H₂/CO mixtures: effect of CO₂ dilution, preheat temperature, and pressure. Combustion and Flame, 2007, 151(1-2): 104-119

17 Liu D D S, Macfarlane R. Laminar burning velocities of hydrogen-air and hydrogen-air-steam flames. Combustion and Flame, 1983, 49(1-3): 59-71

18 Ilbas M, Crayford A P, Yilmaz I, Bowen P J, Syred N. Laminar burning velocities of hydrogen-air and hydrogen-methane-air mixtures: an experimental study. International Journal of Hydrogen Energy, 2006, 31(12): 1768-1779

19 Takahashi F, Mizomoto M, Ikai S. Laminar burning velocities of hydrogen/oxygen/inert gas mixtures. Alternative Energy Sources. III. Nuclear Energy/Synthetic Fuels, 1983, 5: 447

20 Dowdy D R, Smith D B, Taylor S C, Williams A. The use of expanding spherical flames to determine burning velocities and stretch effects in hydrogen-air mixtures. Proceedings of the Combustion Institute, 1990, 23: 325-332

21 Aung K T, Hassan M I, Faeth G M. Flame stretch interactions of laminar premixed hydrogen/air flames at normal temperature and pressure. Combustion and Flame, 1997, 109(1-2): 1-24

22 Lamoureux N, Djebaili-Chaumeix N, Paillard C E. Laminar flame velocity determination for H₂-air-He-CO₂ mixtures using the spherical bomb method. Experimental Thermal and Fluid Science, 2003, 27(4): 385-393

23 Huang Z H, Zhang Y, Zeng K, Liu B, Wang Q, Jiang D M. Measurements of laminar burning velocities for natural gas-hydrogen-air mixtures. Combustion and Flame, 2006, 146(1-2): 302-311

24 Vagelopoulos C M, Egolfopoulos F N. Laminar flame speeds and extinction strain rates of mixtures of carbon monoxide with hydrogen, methane, and air. Proceedings of the Combustion Institute, 1994, 25(1): 1317-1323