Liqiao Jiang

Liqiao Jiang
Guangzhou institute of energy conversion, chinese academy of science · Lab of Combustion and Thermal Fluid

Doctor of Engineering

About

68
Publications
5,521
Reads
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557
Citations
Citations since 2016
38 Research Items
404 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Introduction
Laser diagnostics , plat and coflow flames
Skills and Expertise

Publications

Publications (68)
Article
Wall coating modification has been a potential solution to organize the combustion process in space-constrained system. For this purpose, CeO2 doping effects on the flame stability of premixed methane/air mixtures confined within an adjustable-gap narrow channel with coating ZrO2-based ceramics are experimentally investigated. A series of character...
Article
Full-text available
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
From the perspective of the thermal/chemical performance management of a slot burner, three kinds of blended coatings with the low thermal conductivity and certain chemical activities, including 30wt.%Y2O3/ZrO2, 30wt.%MgO/ZrO2 and 30wt.%Al2O3/ZrO2, were prepared on stainless steel walls plated by atmospheric plasma spraying. The effects of coating...
Article
Full-text available
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
A miniature constant-volume chamber setup was utilized to carry out experimental study of ignition and combustion characteristics of injected n-butane/air mixtures. Results indicate that the flame of the injected n-butane/air mixture forms at the hot wire surface and then spreads outwards. In the following stage,the injected n-butane/air mixtures a...
Article
Full-text available
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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The combustion of AC 10 H 20 droplets was investigated to explore the combustion performance of liquid fuels in localized stratified vortex-tube combustor (LSVC). The evaporation ratio, flame structure, stability limit, heat loss, and combustion efficiency in the LSVC were investigated under various equivalence ratios and fuel mass fluxes numerical...
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 novel vortex-tube combustor with axial fuel injection for NOx reduction was proposed to overcome the instability of ultra-lean combustion. The stability limit, flame configuration, NOx and CO emissions, and flame structure were investigated experimentally under various global equivalence ratios and fuel flow rates. The mechanisms of NOx emission...
Article
Full-text available
To solve problems of the low burn-off rate and the flame instability in a conventional rapidly mixed tubular flame (RMTF) burner and problems of the flashback and the narrow extinction limits in a premixed tubular flame burner, a new fuel/air mixing mode with multi-staged inlets was proposed and applied to a tubular flame burner, called the multi-s...
Article
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The stabilization performance and mechanisms in a diffusion‐like vortex‐tube combustor is investigated for oxygen‐enriched combustion. The stability limit, flame configuration, and pressure fluctuation are investigated under various conditions. Results show that a diffusion‐like flame structure is established in the combustor and the nonpremixed pe...
Article
The stabilization performance and mechanisms in a diffusion-like vortex-tube combustor is investigated for oxygen-enriched combustion. The stability limit, flame configuration, and pressure fluctuation are investigated under various conditions. Results show that a diffusion-like flame structure is established in the combustor and the non-premixed p...
Article
The operating limit and pressure fluctuations of a localized stratified vortex-tube combustor (LSVC) are investigated experimentally by taking methane as fuel at the inlet temperature of 300 K and the combustor pressure of 1 atm over a range of equivalence ratios (0.1-1.0). The combustion modes are distinguished according to the properties of press...
Article
The structure and instability characteristics of non-adiabatic fuel-rich n-butane/air cellular flames on McKenna burner were experimentally investigated at atmospheric pressure. Planar Laser Induced Fluorescence (PLIF-OH and PLIF-CH2O) flame diagnosis technology was utilized to probe the flame structure under varied equivalence ratio and inflow mix...
Article
The combustion characteristics in a localized stratified tubular flame burner (LSTFB) were experimentally studied under lean conditions. The stability limit and pressure fluctuation were obtained under various global equivalence ratios and fuel flow rates. The mechanisms driving the combustion instability were analyzed with the combination of numer...
Article
Full-text available
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
Full-text available
Aimed to intensify the ignition and combustion process of n‐butane fuel in micro internal combustion (IC) engines, ignition delay characteristics of n‐butane/air mixtures with tert‐butyl hydroperoxide (TBHP) addition ratios below 10% were investigated numerically by CHEMKIN‐PRO software. Results show that ignition delay times of n‐butane can be sho...
Article
Full-text available
Experimental and computational results on the combustion performances and their formation mechanisms were presented and compared in two types of tubular flame burners by using methane as fuel. Results corroborate that the localized stratified tubular flame burner (LSSTFB) can achieve a large stability limit as a consequence of the edge-like flame s...
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...
Article
Full-text available
This paper explores Rayleigh scattering thermometry via a wavelength of 355 nm through a unique measurement scheme. In this context, the p-polarization and s-polarization Rayleigh scattering of flame and air (as the temperature calibration reference) are measured. Subtraction of p-polarization Rayleigh scattering intensity from that of s-polarizati...
Article
Full-text available
A three-dimensional numerical simulation of a localized stratified tubular flame burner is carried out by using propane as fuel. The characteristics of the flow field, species distribution, flame structure, and stability limit are investigated. Results show that in the cold flow field, a specific distribution of species is formed due to the unique...
Article
Full-text available
Regular pyrometry techniques have been extensively used to infer the temperature field in sooting flames from soot luminosity. However, correction for soot self-absorption along the line-of-sight needs to be considered. The original contribution of the present paper is to assess both numerical and experimental uncertainties that can be attributed t...
Article
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The laminar flame propagation in narrow confined disc-shape chambers of millimeter scale is investigated, concerning the flame front displacement speed and the influences from the changes of the gap width and radius. An asymptotic analysis treating the flame front as a discontinuity successfully predicts the velocity profiles of the flame front and...
Article
A disc-like gap chamber was developed to investigate the microscale effects on flame propagation characteristics in closed chamber, which is very important to understand the combustion process in micro internal combustion engines. Under initially normal pressure and temperature, the morphology and evolution of outwardly propagating flame, the flamm...
Article
Full-text available
The combustion characteristics of dimethyl ether (DME) in a partially premixed tubular flame burner have been investigated numerically. The species distribution, stability limit of tubular flame, wall temperature and burn-off rate have been studied at different equivalence ratios and inlet velocities. Meanwhile, the corresponding combustion charact...
Article
The current study originally presents a detailed approach to implement the p-xylene based two-color PLIF for measuring gaseous mixture temperature and mole concentration field simultaneously. An 80 ∗ 0.8 mm2 laser sheet at 266 nm is employed to excite homogenous p-xylene/nitrogen steady mixture flow in a calibration cell, where the known p-xylene m...
Article
Full-text available
This paper explores the characteristics of absorption and fluorescence spectra of p-xylene within the temperature range that is frequently encountered during the mixture formation in internal combustion engines. At 266 nm wavelength, the p-xylene absorption cross section shows a mean value of (3.4 ± 0.2) × 10−19 cm2/molecule within the temperature...
Article
The concentrations of CO2 and H2O in the combustion environment are important for the combustion characteristics of oxygen-enriched flames using hot oxidizers with large amount of CO2 and/or H2O. To understand the variations of flame temperature and stretch extinction limit of oxygen-enriched flames with H2O and CO2 concentrations, the CH4/CO2 vers...
Article
The combustion characteristics of non-premixed methane micro-jet flame in coflow air were investigated experimentally and numerically. A detailed reaction mechanism was employed in the two-dimension numerical computation. The thermal interaction between the flame and solid tube was considered by using fluid-solid coupled thermal boundaries in the n...
Article
The combustion characteristics of non-premixed hydrogen micro-jet flames in co-flow air were investigated in a wide fuel flow velocity range experimentally and numerically to extend the knowledge on non-premixed micro flame. The direct flame images were captured by a digital reflex camera with long exposure time, and the OH radical distributions in...
Article
Full-text available
Flame propagation characterisitcs of outwardly propagating flames were experimentally studied in a 2 mm gap disc-like micro chamber filled with equivalence ratios at ø=1.0-1.6 quiescent propane/air mixture ignited in the centre at atmospheric pressure and temperature by a high speed camera. The smooth, wrinkled and crack flame shapes are observed....
Article
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The combustion characteristics of methane non-premixed micro-jet-flames in coflow airs were studied experimentally for development of micro-combustor and extension of combustion theory of micro-combustion. Stainless steel tubes with the inner diameters of 710 μ m, 425 μ m and 280 μ m were employed in the study. The flame shapes, heights, blow off l...
Article
A detailed modeling study was performed to investigate the inhibitory effect of the interior surface of a reactor in the process of low-temperature oxidation of methanol–air mixture. By using the reduction technique, which is for the gas-phase kinetic mechanism, a modified nine-step skeletal mechanism for the low-temperature methanol oxidation was...
Article
A micro gas turbine combustor with sintered porous chamber wall as inlet was tested and simulated. When burning methane in the 2.14 cm3 chamber volume combustor, its maximum power density reached 336M W/m3. The combustion efficiency was above 90% when produced 850~1100K exit gas. The pressure drop ratio of porous inlet was below 5kPa with 6L/min pr...
Article
Full-text available
A surface reaction kinetic model for the combustion of methanol/air mixture was developed in order to investigate the ignition inhibitory mechanism of wall on the premixed gas in a micro closed volume. In this model, except for H, O, OH and CH3 radicals, the absorption of hydrogen peroxide and hydroperoxyl on the surface were also considered. By ap...
Article
Full-text available
The ignition process of premixed methane/air in a micro-scale chamber is simulated with the combination of surface chemistry and gas-phase reactions. The effect of different parameters on the ignition characteristics are analyzed in detail and the sensitive analysis is performed on main elementary reactions. It is found that the ignition of the mix...
Article
To examine the effects of the wall on flame quenching, an OH-PLIF investigation of a premixed methane/air flame was conducted with a slit burner between two parallel walls. Three types of materials, i.e., stainless steel 304, silicon, and zirconia ceramics, were tested at wall temperatures of 300 and 600 °C. The quenching process, captured by an in...
Article
Full-text available
The flame configuration of three linearly arranged premixed micro flames was investigated experimentally by adjusting the distance between tubes, jet velocity and equivalence ratio. Intensified charge coupled device (ICCD) was used to record the flame configurations and the distribution of CH. The result shows that with the decrease of the distance...
Article
Full-text available
Proposed in this paper is a method to measure the temperature of micro flames using an auto-scanning micro thermocouple. In the investigation, first, the effects of thermocouple size and hot flue gas velocity on the measurement error are theoretically analyzed. Next, the effects of data acquisition time interval and thermocouple moving velocity on...
Conference Paper
Full-text available
The effects of flame interaction on flame configuration and temperature distribution among three linearly arranged partially premixed jet micro flames were investigated experimentally. Equivalence ratio, jet velocity and the distance between jet tubes are adjusted to obtain interacting flames with different extents. In the experiment, an intensifie...
Article
This paper investigated the emission characteristic of formaldehyde and NOx in DME/LPG premixed plane flame under different fuel proportions. The results show that the concentration of formaldehyde increases with the mass proportion of DME at the same fuel-air equivalence ratio and fuel mass. The concentration peak value of formaldehyde in the mixe...
Article
Effects of different surface conditions on flame quenching of premixed methane/air flame were investigated by using a slit burner between two parallel walls. Influencing factors of effect of different materials on quenching characteristics were discussed basing on surface analysis. The obtained results show that surface temperature and surface char...
Article
Effects of different surface conditions on OH intensity above the surface of premixed methane/air flame at slit burner between two parallel walls were investigated by OH-PLIF (Planar Laser-Induced Fluorescence) testing technology. The obtained results show that instability flame propagation appears in slit flame with the decrease of distance betwee...
Article
A centimeter magnitude thermoelectric (TE) power generation system based on a plat-flame micro combustor burning DME (dimethyl ether) has been developed. The chamber wall of this micro combustor was made of two parallel sintered porous plates which acted as mixture inlet. The main virtue of this combustor is that it can keep combustor wall at lower...
Article
A centimeter magnitude plat-flame micro combustor, which burns hydrocarbon mixture and provides heat source for thermoelectric(TE) power generation system, has been developed the performance of the micro combustor and the TE power generation system have been tested. The working principle of the plat-flame micro combustor is that two porous parallel...
Article
A numerical simulation of chemical kinetic process in DME/air counterflow diffusion flame with a detailed kinetic model is performed. The chemical kinetic process of dimethyl ether oxidation in the diffusion flame is obtained by analyzing the reaction rates of the elementary reactions, the key intermediate species and radicals. The results indicate...
Article
Aimed to optimize a low heat loss micro-combustor whose chamber wall is made of porous material, the combustion characteristics of methane/air premixed flames on porous wall surface was investigated experimentally. The results show that flat flames form at a limited range of mixture flow velocity (v) and equivalence ratio (φ). At φ<1, The limited v...
Article
The combustion characteristics of micro methane/air premixed flames in quiescent air have been experimentally studied. Both flame height characteristics and micro-scale effects on flame extinction characteristics have been investigated. The results show that micro premixed flames are laminar flames, that flame height is proportional to mean rejecti...
Article
At different fuel equivalence ratio and mixture flow rate of methane/air mixture, based on penetration combustion in a micro combustor with cylindrical porous wall, this study investigated the key parameters, both inner diameter (d) and height (h) of chamber, how to influence the performance of the combustor. The results showed the blow off velocit...
Article
The methane micro diffusion flames in micro nozzle in air are investigated numerically, with the focus on the influence of heat and mass transfer in the nozzle on the characteristics of the flames. The results show that at low flow velocity, the mixing process of fuel and air takes place in the nozzle whose inner diameter is 0.3 mm and where the fu...
Article
A novel miniature cylindrical combustor, whose chamber wall is made of porous material, has been designed and experimented for reducing heat loss and enhancing flame stability. The combustor has the function of reducing wall heat loss, extending residence time and avoiding radical chemical quenching with a self-thermal insulation concept in which h...
Article
Full-text available
Numerical analysis was used to study the deposition and burning characteristics of combining co-combustion with slagging combustion technologies in this paper. The pyrolysis and burning kinetic models of different fuels were implanted into the WBSF-PCC2 (wall burning and slag flow in pulverized co-combustion) computation code, and then the slagging...
Article
The methane micro diffusion flames in micro nozzle in air are investigated numerically. We focus on the influence by heat and mass transfer in the nozzle on the characteristic of the flame. The results show that at constant low flow velocity conditions, with the inner diameter decreases, the transport of mass and heat happen in the opposite directi...
Article
Based on the previous studies of cold experiment and modeling, the numerical simulation of combustion characteristics of low NOx swirling coal-fired furnace was carried on using the CFD software, STAR-CD3.15. Two zones, swirling reductive zone and burnout zone, appear obviously in the furnace with different features. Coal particles swirl and break...
Article
An experimental study has been conducted of a new method for reducing the heat loss of a miniature burner, the working principle of which lies in its preheating of unburned gas mixture by admitting gas uniformly through porous wall surfaces and in the meanwhile by reducing the temperature of the wall surfaces, thus effectively lowering the heat los...
Article
In a slagging combustor or furnace, the high combustion temperature makes the molten slag layer cover the wall and capture the particles. If these particles contain combustible matter, they will continue to burn on the running slag. As a result, the total amount of ash deposition will be much greater than that in dry-wall combustors and the total h...
Article
The structure and extinction characteristics of methane micro-diffusion flames were investigated in quiescent air with small-size ports with diameter varied from 0.2 mm to 1.0 mm. When the diameter is less than 0.53 mm, the methane micro-diffusion flames were laminar flames; the flame height was linear to the port injected velocity, and at the same...