Jiepeng Huo's research while affiliated with Chinese Academy of Sciences and other places

Publications (15)

Article
The flame propagation processes involving deflagration-to-detonation transition (DDT) and detonation propagation in a novel millimetre-scale spiral channel (MSDC) are studied experimentally. The channel is of 3.0 mm in width and 5.2 m in length, embedded in a stainless-steel plate. In particular, a tiny gap of 0.02-mm width is reserved between the...
Article
The effects of channel curvature on the flame propagation are examined for premixed flames in micro channels. Previous studies have shown that curved channels can enhance the flame stretching, which can significantly increase the flame propagation speed. In this study, the effect of flame stretching was excluded by the narrow channel limit in order...
Article
The laminar burning velocities (LBVs) of n-decane/toluene/air mixtures were measured at elevated temperatures using externally heated diverging channel (EHDC) method. The effects of initial temperature (up to 650 K), toluene blending ratio (RC7H8 = 0 to 1.0 by liquid volume) and equivalence ratio (ϕ = 0.6 to 1.4) on the LBVs of n-decane/toluene/air...
Article
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The hydrodynamic instability characteristics of non-adiabatic N2-diluted n-butane/air flames generated on McKenna burner were investigated experimentally under atmosphere pressure. In order to capture the quantitative structure of cellular flames, planar laser induced fluorescence technology (OH-PLIF and CH2O-PLIF) was employed, as well as the chem...
Article
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An improved two-color method, which originates from an approximate emissivity ratio model based on the empirical emissivity formula by Hottel and Broughton, was developed to measure the temperature field of soot flames generated on a McKenna burner in the present study. In conjunction with the onion-peeling method and Tikhonov regularization, the r...
Article
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The premixed flame propagation with conductive heat loss in millimeter-scale narrow closed cells of different gap widths is investigated experimentally and numerically. The flame evolution is observed in a disc-shaped cell of which the width is varied from 2.0 mm to 5.0 mm. A non-monotonic relation between the flame propagation velocity and the gap...
Article
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In this work, the structural function of char gasification is modelled theoretically. Considering that different components will have different pore characteristics after pyrolysis, char is divided into different micro-structures according to its corresponding components, and then a structural equation is constructed to realize the theoretical calc...
Article
The chemical catalytic performance of functional ceramics materials of rare earth is of great technological and scientific significance to actively regulate the flame-wall interaction in high-temperature combustion. The premixed methane-air flames in a slot burner with different wall materials were characterized by OH-PLIF technique to gain an insi...
Article
A model was established to describe the effects of inorganic matter on the char-CO2 gasification reactivity. The effects of seven inorganic elements on the char-CO2 reactivity were considered: K, Na, Ca, Mg and Fe, which play a catalytic role, and Si and Al, which play an inhibitory role. A catalytic/inhibitory index factor model and a saturated ca...
Article
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A new skeletal mechanism of n-butane is developed for describing its ignition and combustion characteristics applicable over a wide range of conditions: initial temperature 690–1430 K, pressure 1–30 atm, and equivalence ratio 0.5–2.0. Starting with a detailed chemical reaction kinetic model of 230 species and 1328 reactions (Healy et al., Combust....
Article
Full-text available
Flame propagation pictures of a propane/air mixture are captured by a high-speed camera in a visualized constant volume combustion chamber with a diameter of 150 mm, a parallel plate height of H = 1.45 mm, and an initial pressure of P0 = 1.25 ~ 3.00 bar, in the range of flammable equivalence ratios. The results show that when H of the combustion ch...
Article
The extinction characteristics and lean fuel limits of methane oxy-fuel diffusion flames with oxygen mole fractions of 0.35 and 0.4 were numerically studied by using two different radiation models, namely optically thin radiation model (OTM) and discrete ordinates method (DOM). Experimental studies on extinction limits of the oxy-fuel diffusion fla...
Article
To improve the lifetime and the flame stability of combustion-based micro devices, two coating materials (AlCrN and alumina)are deposited on STS 304 substrate to investigate the interactions between the premixed n-butane/air flame and the solid walls heated to different temperatures in a slit burner. The flame-wall interaction is characterized by t...

Citations

... Further investigations on mechanism evaluation using multi-stage IDT based on combination of existing data measured by RCM and ST can be implemented to explore the first stage heat release for gasoline surrogate fuels under wide range of conditions. For laminar burning velocity data, experimental measurements were obtained using four approaches: spherically expanding flame (SEF) in constant volume/pressure chamber [34], counterflow or stagnation flame [35], burner-stabilized flame (heat flux method) [36], and stabilized planar flame in the diverging channel [37,38]. The dilutions of the reactive mixtures vary a lot because of different Exhaust Gas Recirculation (EGR) compositions and ratios used in different studies [39,40]. ...
... To obtain insight into in-cylinder particle formation and oxidation, the two-color method was applied. The two-color method constitutes an established pyrometric method for determining the temporally resolved soot concentration and temperature in sooting flames [33][34][35]. Soot particles within a flame emit radiation over the entire electromagnetic spectrum. The spectral radiance of a soot cloud is given as where T is the temperature, the wavelength, ( ) the dimensionless emission coefficient, and Ts the temperature of an ideal black body emitting the equivalent radiance as the nonideal radiator with ( ) ≠ 1 . ...
... The advantages of employing TGA in biomass gasification offer flexibility for interested researchers to investigate several important factors affecting gasificationsample feedstocks (including their preparation), the use of catalysts, and operational parameters [77][78][79]. The effects of various catalysts and minerals composition inherently present in biomass feedstocks and chars on the gasification of lignocellulosic biomass have been investigated thoroughly in the literature. ...
... Lu et al. [24] found that the existence of heterogeneous reactions can improve the combustion efficiency in a flow reactor. Li et al. [25] applied Y 2 O 3 -ZrO 2 coating on the walls of a small combustion channel to improve combustion stability of methane/air flames. Additionally, blended combustion can also promote micro-flame stability [26]. ...
... Thermogravimetric analysis (TGA) is a versatile technique used to examine the thermal degradation behaviour, temperature profiles, and waste potential properties of potential biomass-based raw materials for energy recovery [19]. Numerous studies have employed TGA to examine the thermal behaviour and energy recovery potential of biomass feedstock through torrefaction [20,21], pyrolysis [22,23], and gasification [24,25] in the literature. TGA is typically performed under either oxidative (air/oxygen) or nonoxidative (nitrogen, carbon dioxide) conditions to simulate combustion, pyrolysis, or torrefaction. ...
... 41 Usually, sensitivity analysis is performed to eliminate or retain the unimportant species and reactions with relatively lower contribution rates to achieve the optimal reduced skeletal mechanism. 46 It is incorporated with the help of the Jacobi matrix method, which accounts for the effects of temperature difference on the reaction rate of the species involved in n- 3. RESULTS AND DISCUSSION 3.1. Mechanism Reduction. ...
... Xing Li et al. [17] conducted experiments to investigate the effect of external air on the characteristics of non-premixed methane/air flame. Daiqing Zhao et al. [18] found a thermal coupling between micro flame and nozzle, and the influence of the nozzle on the flame was significant. In previous studies, hydrogen, methane, n-butane, etc., were primarily used as combustible gas. ...
... Many studies have shown that since the Planck mean absorption coefficient of CO 2 is high, the radiative heat loss may have influence on the predicted extinction strain rates, depending on the studied combustion systems [100][101][102][103]. Furthermore, if the heat radiation is important on the studied combustion system, an accurate model for the prediction of radiative heat loss is necessary. ...
... The same OH-PLIF system has been described in detail in [42,43]. Briefly, a pulsed ultra-violet (UV) laser beam generated with a Nd:YAG laser (Quanta-Ray Pro-230) pumped dye laser (Sirah PSCAN-G-30) was transferred to a laser sheet with a height of 60 mm and a thickness of 0.1 mm by some cylindrical and spherical lenses. ...