TY - JOUR
T1 - Effects of dilution on blowout limits of turbulent jet flames
AU - Chao, Yei Chin
AU - Wu, Chih Yung
AU - Lee, Kuo Yuan
AU - Li, Yueh Heng
AU - Chen, Ruey Hung
AU - Cheng, Tsarng Sheng
N1 - Funding Information:
in the current study. For calculating the various fuel parameters, the data of kinetic viscosity, diffusivity, density, maximum laminar flame speed, and adiabatic flame temperature were calculated by the equilibrium package of the CHEMKIN collection 3 and compared with the data calculated by the software tool provided on the web site http://grashof. engr.colostate.edu/tools/SoftwareTools.html to ensure the validity of the current work. The web site is supported by Colorado State University and offers online calculation for thermal dynamics and kinetics properties of ideal gas mixtures.
Funding Information:
An extended database on blowout velocities of inert-diluted methane, propane, and hydrogen jet flames in the turbulent regime was experimentally established and used to examine and verify existing theories of blowout velocity estimation. Helium, argon, nitrogen, and carbon dioxide were used as the inert diluents to generate different initial properties at the jet exit. The theories of blowout velocity estimation by Kalghatgi (Combust. Sci. Technol., vol. 26, pp. 233–239, 1981) and Broadwell et al. (Proc. Combust. Instit., vol. 20, pp. 303–310, 1984) in the highly diluted regime were carefully examined using jet flames of different fuels diluted with inerts of different gas properties. The results showed that among the theories the blowout velocity estimation of Kalghatgi is more reliable in the extended region. On the other hand, the Accepted 11 March 2004. The financial support by National Science Council, ROC, through projects NSC90-2212-E-006-120 and NSC91-2212-E-006-039 are gratefully acknowledged. *Address correspondence to [email protected]
PY - 2004/10
Y1 - 2004/10
N2 - An extended database on blowout velocities of inert-diluted methane, propane, and hydrogen jet flames in the turbulent regime was experimentally established and used to examine and verify existing theories of blowout velocity estimation. Helium, argon, nitrogen, and carbon dioxide were used as the inert diluents to generate different initial properties at the jet exit. The theories of blowout velocity estimation by Kalghatgi (Combust. Sci. Technol., vol. 26, pp. 233-239, 1981) and Broadwell et al. (Proc. Combust. Instit., vol. 20, pp. 303-310, 1984) in the highly diluted regime were carefully examined using jet flames of different fuels diluted with inerts of different gas properties. The results showed that among the theories the blowout velocity estimation of Kalghatgi is more reliable in the extended region. On the other hand, the blowout velocity estimation of Broadwell et al. can do as well after proper modification by including the Reynolds number effect Ref. Based on the experimental results, modifications to the theories are proposed to accommodate for the deviation when they are used in the diluted regime. In addition, different from laminar jet flames, diffusive properties in terms of mass and thermal diffusivities are not the dominant parameters of blowout velocity in turbulent jet flames.
AB - An extended database on blowout velocities of inert-diluted methane, propane, and hydrogen jet flames in the turbulent regime was experimentally established and used to examine and verify existing theories of blowout velocity estimation. Helium, argon, nitrogen, and carbon dioxide were used as the inert diluents to generate different initial properties at the jet exit. The theories of blowout velocity estimation by Kalghatgi (Combust. Sci. Technol., vol. 26, pp. 233-239, 1981) and Broadwell et al. (Proc. Combust. Instit., vol. 20, pp. 303-310, 1984) in the highly diluted regime were carefully examined using jet flames of different fuels diluted with inerts of different gas properties. The results showed that among the theories the blowout velocity estimation of Kalghatgi is more reliable in the extended region. On the other hand, the blowout velocity estimation of Broadwell et al. can do as well after proper modification by including the Reynolds number effect Ref. Based on the experimental results, modifications to the theories are proposed to accommodate for the deviation when they are used in the diluted regime. In addition, different from laminar jet flames, diffusive properties in terms of mass and thermal diffusivities are not the dominant parameters of blowout velocity in turbulent jet flames.
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U2 - 10.1080/00102200490487580
DO - 10.1080/00102200490487580
M3 - Article
AN - SCOPUS:4644247776
SN - 0010-2202
VL - 176
SP - 1735
EP - 1753
JO - Combustion science and technology
JF - Combustion science and technology
IS - 10
ER -