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Jian Gao

Bio: Jian Gao is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Combustion & Adsorption. The author has an hindex of 6, co-authored 17 publications receiving 116 citations. Previous affiliations of Jian Gao include Toyohashi University of Technology & Hokkaido University.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors revisited the problem of opposed fire spread under limited and excessive oxygen supply and reviewed various near-limit fire phenomena, as recently observed in flaming, smoldering, and glowing spread under various environment and fuel configurations.

40 citations

Journal ArticleDOI
01 Jan 2017
TL;DR: In this paper, a comparison of flame base structures of hydrogen/methane-air diffusion flames formed over a tiny-jet is made numerically for both isothermal and thermal conductive burner conditions, in order to clarify the fuel dependent flame stabilization mechanisms.
Abstract: In this study, a comparison of flame base structures of hydrogen/methane–air diffusion flames formed over a tiny-jet is made numerically for both isothermal and thermal conductive burner conditions, in order to clarify the fuel dependent flame stabilization mechanisms. It is found that, unlike a methane flame, the flame base of a hydrogen flame always attaches to the burner. The analyses indicate that the dominant intermediate-consumption steps have significantly lower activation energies for the hydrogen flame as compared to a methane flame. More importantly, one of the HO 2 production reactions (R43f: H + O 2 + M → HO 2 + M), which has a dominant role in sustaining reactivity at the flame base, shows a negative temperature dependence, causing the heat release rate in the flame base kernel to increase as the burner wall temperature decreases. With a thermal conductive burner (thermal conductivity of 16 W/m-K) over a wide range of fuel jet velocities (0.5–4.0 m/s), it is found that the burner tip is heated to a significantly higher temperature by a hydrogen flame due to its unique stabilization mechanism. The mixing effects of hydrogen and methane are then considered. It is found that the burner tip temperature can be reduced by adding methane into the fuel flow. This is because, according to the investigation of the structures of the hydrogen/methane jet diffusion flames, the reaction rate of R43f is suppressed due to the included intermediates (e.g., CH 3 , CH 2 O) consumption steps of methane. It is expected that the flame attachment feature associated with the flame base structure can be easily controlled by mixing hydrogen and methane, making it possible to control the burner tip temperature in advance.

35 citations

Journal ArticleDOI
TL;DR: In this article, a series of two-dimensional axisymmetric numerical computations are performed for methane-air flames over a sub-millimeter (constant inner diameter of 0.8mm) jet.

27 citations

Journal ArticleDOI
TL;DR: In this paper, a transient two-dimensional axisymmetric numerical computation with a 36-step kinetic model and detailed transport properties is conducted, and the transition limit is found and depicted in the TR-ϕ plane.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the authors evaluated the application of spent tyre activated carbons (STAC) in dye adsorption, heavy metal removal from wastewater, and flue gas cleaning, and its general performance against commercial activated carbon (CAC).

20 citations


Cited by
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01 Apr 1997
TL;DR: A detailed chemical kinetic model has been used to study dimethyl ether (DME) oxidation over a wide range of conditions, such as jet-stirred reactor (JSR) at I and 10 atm, 0.2 < 0 < 2.5, and 800 < T < 1300 K.
Abstract: A detailed chemical kinetic model has been used to study dimethyl ether (DME) oxidation over a wide range of conditions. Experimental results obtained in a jet-stirred reactor (JSR) at I and 10 atm, 0.2 < 0 < 2.5, and 800 < T < 1300 K were modeled, in addition to those generated in a shock tube at 13 and 40 bar, 0 = 1.0 and 650 :5 T :5 1300 K. The JSR results are particularly valuable as they include concentration profiles of reactants, intermediates and products pertinent to the oxidation of DME. These data test the Idnetic model severely, as it must be able to predict the correct distribution and concentrations of intermediate and final products formed in the oxidation process. Additionally, the shock tube results are very useful, as they were taken at low temperatures and at high pressures, and thus undergo negative temperature dependence (NTC) behavior. This behavior is characteristic of the oxidation of saturated hydrocarbon fuels, (e.g. the primary reference fuels, n-heptane and iso- octane) under similar conditions. The numerical model consists of 78 chemical species and 336 chemical reactions. The thermodynamic properties of unknown species pertaining to DME oxidation were calculated using THERM.

280 citations

Journal ArticleDOI
TL;DR: In this article, the ozone assisted low temperature oxidation chemistry of dimethyl ether (DME) from 400k to 750k has been investigated in the mixture of DME/O3/O2/He/Ar in an atmospheric-pressure flow reactor coupled with the molecular beam mass spectrometry sampling technique.

110 citations

Journal ArticleDOI
TL;DR: A review of recent progress in detection and quantification of hydroperoxides, and to understand their reaction kinetics in combustion environments is presented in this paper, along with challenges and perspectives are offered regarding the future of accurately measuring molecule-specific hydroperoxide concentrations and understanding their respective reaction reactions.

107 citations

Journal ArticleDOI
15 Feb 2016-Fuel
TL;DR: In this paper, a 1D planar premixed cool flame induced by a hot pocket is simulated for DME/O2/N2 mixtures with detailed chemistry and transport, demonstrating the existence of a residence time window for quasi-steady propagation.

84 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of flow rate and propane blended ratio of the fuel on combustion and thermal performance were investigated in a micro thermophotovoltaic (TPV) system, and the results indicated that the flame stability and heat transfer of premixed H2/C3H8/air combustion can be significantly enhanced in PM.

67 citations