A5089824825- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Biodiesel Production and Applications
- Combustion and Detonation Processes
- Fire dynamics and safety research
- Thermochemical Biomass Conversion Processes
- Vehicle emissions and performance
- Electrocatalysts for Energy Conversion
- Oil and Gas Production Techniques
- Catalytic Processes in Materials Science
- Reservoir Engineering and Simulation Methods
- Fuel Cells and Related Materials
- Fluid Dynamics and Thin Films
- Adhesion, Friction, and Surface Interactions
- Coal and Coke Industries Research
- Fluid Dynamics and Heat Transfer
- Lipid metabolism and biosynthesis
- Petroleum Processing and Analysis
- Enhanced Oil Recovery Techniques
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Catalysis and Hydrodesulfurization Studies
- Drilling and Well Engineering
- Water Systems and Optimization
- Fluid Dynamics and Mixing
- Lattice Boltzmann Simulation Studies
Lanzhou University
2025
University of Leeds
2012-2024
Ningbo Polytechnic
2024
University College London
2024
Imperial College London
2016
Chalmers University of Technology
2009-2012
Wuhan University
1998
Spherically expanding flame propagations have been employed to measure speeds for H2/CH4/air mixtures over a wide range of H2 fractions (30 %, 50 70 and 100 % hydrogen by volume), at initial temperatures 303 K 360 K, pressures 0.1, 0.5 1.0 MPa. The equivalence ratio (ϕ) was varied from 2.5 pure 0.8 1.2 methane/hydrogen mixtures. Experimental laminar burning velocities Markstein numbers methane/hydrogen/air high pressures, which are crucial gas turbine applications, very rare in the...
Metal foam flow-fields (MFFs) exhibit immense potential for enhancing the performance of polymer electrolyte fuel cells (PEFCs) owing to their advantageous pore connectivity and abundant gas pathways. Nevertheless, challenges remain with conventional MFF concerning reactant homogeneity water management. To address these concerns, this study incorporates a fractal manifold into design. By employing operando neutron imaging, device-level testing, electrochemical impedance spectroscopy (EIS),...
The extraction of cellular structure feature on the spherical premixed flame surface faces accuracy challenges. Schlieren technique was employed to obtain hydrogen-air flames images in a constant volume vessel at room temperature and atmospheric pressure under an equivalent ratio 0.8 this work. A bio-inspired Cellpose 2.0, driven by deep learning, is innovatively introduced train cell segmentation model combustion field. After labeling training cells different shapes sizes, efficient...
In this study, the influences of pressure, temperature and equivalence ratio on onset cellular instabilities in premixed hydrogen/air laminar flames were studied using a constant volume fan-stirred combustion vessel. The instability is marked by critical stretch rate, at which flame speed rapidly deviates from its prior response to stretch. It noted that Peclet number, Pecl, increases with increasing both temperature, indicating more stable flame. Whilst, Pecl decreases initial pressure due...
Darrieus–Landau (D-L) instability can cause significant acceleration in freely expanding spherical flames, which lead to accidental large-scale gas explosions. To evaluate the potential of using high-pressure lab-scale experiments predict onset cellular instabilities atmospheric explosions, experimental measurements for hydrogen and methane mixtures are conducted, laboratory explosions at elevated pressures. These compared with those from several experiments. Comprehensive correlations...
Laminar flame characteristics of ethane/hydrogen/air (with XH2 = 25 %, 50 75 % and 100 by volume) within an equivalence ratio from 0.7 to 1.3 were determined in a spherical constant volume combustion vessel at elevated pressure up 0.5 MPa, temperature 360 K. Key such laminar burning velocity, Markstein length/number, thickness, effective Lewis number, thermal expansion coefficient critical conditions the onset cellular instability including radius Peclet either measured or calculated. These...
The use of biodiesel in conventional diesel engines results increased<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>NO</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>emissions; this presents a barrier to the widespread biodiesel. origins phenomenon were investigated using chemical kinetics simulation tool: CHEMKIN-2 and CFD KIVA3V code, which was modified account for physical properties incorporate semidetailed...
The cellular flame area continues to increase with the development of cells on spherical surface, which will greatly promote burning rate and propagation speed. This work mainly focuses a new three-dimensional (3D) reconstruction method structure attempting quantitatively characterize real area. Initially, visualization investigation hydrogen-air premixed flames within constant volume vessel was conducted using Schlieren optical technique under room temperature atmospheric pressure...
The self-acceleration and global pulsation of spherically expanding laminar hydrogen-air flames were studied in a spherical explosion vessel, over wide range equivalence ratios (0.4–2.0), initial temperatures (300–400 K), pressures (0.1–0.7 MPa). Comprehensive quantitative data on the propagation unstable obtained. results show that self-similarity appears after onset instability, previous assertion acceleration exponent α = 1.5 is not valid for flames. derived values such vary from 1.125...
Coal-based naphtha features a low Octane number and is promising fuel as potential energy supplements for advanced compression ignition engines where the auto-ignition dominates combustion process. However, its characteristics including delay times (IDTs), knocking propensity have not been well studied yet. In present work, Leeds optical Rapid Compression Machine (RCM) equipped with simultaneous pressure acquisition high-speed photography was implemented to study IDTs knock properties of...
Particle image velocimetry (PIV) was employed to investigate the disturbance of unstable laminar hydrogen-air outwardly propagating spherical flames in a explosion vessel. Both flame speed and gas velocities exhibit acceleration due wrinkled surface. This occurs throughout cycle strong weak phases, which is driven by division expansion cells across front. The exponent, α, velocity ahead αg, are nearly identical. suggests close interrelation between self-acceleration (Sn) front (ug). Stronger...
Coal-based naphtha is a promising alternative fuel as it fits the standards of energy replacement and technologically mature, safe, dependable. However, its laminar combustion characteristics have not been well studied. The burning velocities Markstein lengths kind coal-based (C6.97142H15.88244) over range initial conditions were measured by Particle Imaging Velocimetry (PIV) in spherical explosions. In addition, 3-component surrogate model (62.4 mol% n-C6H14, 32.5 i-C8H18 5.1 i-C7H16) based...