Abstract
As described in the literature review section in the previous chapter, there exists a knowledge gap how ignition initiates by a hot turbulent jet. What are the ignition mechanisms from a fundamental point of view? What are the nondimensional parameters governing the ignition mechanism? To explore the fundamental ignition mechanisms by a hot turbulent jet, an experimental setup was built that uses a dual-chamber design (a small pre-chamber resided within the big main chamber). Two fuels, methane and hydrogen, were studied. Simultaneous high-speed schlieren and OH* chemiluminescence imaging were applied to visualize the jet penetration and ignition processes. It was found there exist two ignition mechanisms – flame ignition and jet ignition. A parametric study was conducted to understand the effects of several parameters on the ignition mechanism and probability, including orifice diameter, initial temperature and pressure, fuel/air equivalence ratios in both chambers, and pre-chamber spark position. The mean and fluctuation velocities of the transient hot jet were calculated according to the measured pressure histories in the two chambers. A limiting global Damköhler number was found for each fuel, under which the ignition probability is nearly zero. Lastly, the ignition outcome of all tests (no ignition, flame ignition, and jet ignition) was marked on the classical turbulent combustion regime diagram. These results provide important guidelines for design and optimization of efficient and reliable pre-chambers for natural gas engines.
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References
Smith, G.P., et al.: Low pressure flame determinations of rate constants for OH(A) and CH(A) chemiluminescence. Combust. Flame. 131(1), 59–69 (2002)
Luque, J., et al.: CH(A-X) and OH(A-X) optical emission in an axisymmetric laminar diffusion flame. Combust. Flame. 122(1), 172–175 (2000)
Orain, M., Hardalupas, Y.: Measurements of local mixture fraction of reacting mixture in swirl-stabilised natural gas-fuelled burners. Appl. Phys. B. 105(2), 435–449 (2011)
Elhsnawi, M., Teodorczyk, A.: Studies of mixing and ignition in hydrogen-oxygen mixture with hot inert gas injection. In: Proceedings of the European Combustion Meeting. Warsaw University of Technology ITC, Nowowiejska, Warszawa (2005)
Sadanandan, R., et al.: 2D mixture fraction studies in a hot-jet ignition configuration using NO-LIF and correlation analysis. Flow Turb. Combust. 86(1), 45–62 (2010)
Sadanandan, R., et al.: Detailed investigation of ignition by hot gas jets. Proc. Combust. Inst. 31(1), 719–726 (2007)
Iida, N., Kawaguchi, O., Sato, G.T.: Premixed flame propagating into a narrow channel at a high speed, part 2: transient behavior of the properties of the flowing gas inside the channel. Combust. Flame. 60(3), 257–267 (1985)
Law, C.K.: Combustion Physics, vol. xviii, p. 722. Cambridge University Press, Cambridge, MA/New York (2006)
Crane Co: Engineering Division. In: Flow of Fluids through Valves, Fittings, and Pipe. Crane Company Technical paper. Crane Co, Chicago (1957)
Peters, N.: Turbulent combustion. In: Cambridge Monographs on Mechanics, vol. xvi, p. 304. Cambridge University Press, Cambridge, MA/New York (2000)
Reaction Design: Reaction Workbench 15131 San Diego (2013) http://www.reactiondesign.com/support/help/help_usage_and_support/how-to-citeproducts/
Debonis, J.R., Scott, J.N.: Large-Eddy simulation of a turbulent compressible round jet. AIAA J. 40(7), 1346–1354 (2002)
Uzun, A., Hussaini, M.Y.: Investigation of high frequency noise generation in the near-nozzle region of a jet using large eddy simulation. Theor. Comput. Fluid Dyn. 21(4), 291–321 (2007)
Iglesias, I., et al.: Numerical analyses of deflagration initiation by a hot jet. Combust. Theory Modell. 16(6), 994–1010 (2012)
Carpio, J., et al.: Critical radius for hot-jet ignition of hydrogen–air mixtures. Int. J. Hydrog. Energy. 38(7), 3105–3109 (2013)
Borghi, R.P.: On the structure and morphology of turbulent premixed flames. In: Casci, C. (ed.) Recent Advances in the Aerospace Sciences, pp. 117–138. Springer, Boston (1985)
Peters, N.: Laminar flamelet concepts in turbulent combustion. Int. Symp. Combust. 21(1), 1231–1250 (1988)
Abdel-Gayed, R.G., Bradley, D., Lung, F.K.K.: Combustion regimes and the straining of turbulent premixed flames. Combust. Flame. 76(2), 213–218 (1989)
Poinsot, T., Veynante, D., Candel, S.: Diagrams of premixed turbulent combustion based on direct simulation. Int. Symp. Combust. 23(1), 613–619 (1991)
Williams, F.A.: Combustion theory: the fundamental theory of chemically reacting flow systems. In: Combustion Science and Engineering Series, vol. xxiii, 2nd edn, p. 680. Benjamin/Cummings Pub. Co, Menlo Park (1985)
Chen, Y.C., et al.: The detailed flame structure of highly stretched turbulent premixed methane-air flames. Combust. Flame. 107(3), 223–244 (1996)
Chen, Y.C., Mansour, M.S.: Measurements of the detailed flame structure in turbulent H2-Ar jet diffusion flames with line-Raman/Rayleigh/LIPF-OH technique. Int. Symp. Combust. 26(1), 97–103 (1996)
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Biswas, S. (2018). Ignition Mechanisms. In: Physics of Turbulent Jet Ignition. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-76243-2_2
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DOI: https://doi.org/10.1007/978-3-319-76243-2_2
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