Chunkan Yu
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View article: Numerical investigation on spark ignition and flame kernel formation of lean premixed hydrogen/air flame under ICE condition
Numerical investigation on spark ignition and flame kernel formation of lean premixed hydrogen/air flame under ICE condition Open
The present work investigates the spark ignition and flame kernel formation processes in hydrogen–air mixtures under real engine-relevant conditions from a chemical-physical perspective. A one-dimensional numerical model based on the INSFL…
View article: A mathematical approach to spark ignition process in premixed flame systems: modeling and analysis
A mathematical approach to spark ignition process in premixed flame systems: modeling and analysis Open
This study enhances the classic perfectly stirred reactor model by introducing an additional energy source to effectively model the spark ignition process within a laminar premixed flame in a counterflow configuration. A non-dimensional go…
View article: Numerical Study of the Stagnation-Flow Premixed Lean Hydrogen/Air Flame Stabilized at the Wall with the Focus on NO Emission and Flame-Solid Interaction
Numerical Study of the Stagnation-Flow Premixed Lean Hydrogen/Air Flame Stabilized at the Wall with the Focus on NO Emission and Flame-Solid Interaction Open
In this study, we perform a numerical investigation of a steady laminar stagnation flow flame stabilized at a wall with the consideration of heat transport, focusing on a lean hydrogen/air mixture with a fuel/air equivalence ratio 0.6. We …
View article: Mathematical thermo‐mechanical analysis on flame‐solid interaction: Steady laminar stagnation flow flame stabilized at a plane wall coupled with thermo‐elasticity model
Mathematical thermo‐mechanical analysis on flame‐solid interaction: Steady laminar stagnation flow flame stabilized at a plane wall coupled with thermo‐elasticity model Open
A laminar stagnation flow flame stabilized at a plane wall is theoretically analyzed, coupled with a thermo‐elasticity model in the wall. Mathematical models for both the flame and the wall will be proposed, and corresponding analytical so…
View article: Perspectives on NO<sub><i>X</i></sub> Emissions and Impacts from Ammonia Combustion Processes
Perspectives on NO<sub><i>X</i></sub> Emissions and Impacts from Ammonia Combustion Processes Open
Climate change and global warming necessitate the shift toward low-emission, carbon-free fuels. Although hydrogen boasts zero carbon content and high performance, its utilization is impeded by the complexities and costs involved in liquefa…
View article: Comprehensive Assessment of STGSA Generated Skeletal Mechanism for the Application in Flame-Wall Interaction and Flame-Flow Interaction
Comprehensive Assessment of STGSA Generated Skeletal Mechanism for the Application in Flame-Wall Interaction and Flame-Flow Interaction Open
In this study, we conduct a thorough evaluation of the STGSA-generated skeletal mechanism for C 2 H 4 /air. Two STGSA-reduced mechanisms are taken into account, incorporating basic combustion models such as the homogeneous reactor model, o…
View article: An experimental and modeling study on extinction strain rate in C2H flames with varied oxygen content
An experimental and modeling study on extinction strain rate in C2H flames with varied oxygen content Open
The extinction strain rates (ESR) is an important physical-chemical properties of fuels. Therefore, an experiment study on ESR is crucial for studying emission reduction techniques. In this work, the ESR and laminar burning velocity (LBV) …
View article: Ammonia combustion and emissions in practical applications: a review
Ammonia combustion and emissions in practical applications: a review Open
Ammonia is emerging as a viable alternative to fossil fuels in combustion systems, aiding in the reduction of carbon emissions. However, its use faces challenges, including NOx emissions and low flame speed. Innovative approaches and techn…
View article: Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions
Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions Open
Polyoxymethylene dimethyl ether (PODEn, n ≥ 1) is a promising alternative fuel to diesel with higher reactivity and low soot formation tendency. In this study, PODE3-4 is used as a pilot ignition fuel for methane (CH4) and the combustion c…
View article: Ignition characteristics of hydrogen-enriched ammonia/air mixtures
Ignition characteristics of hydrogen-enriched ammonia/air mixtures Open
Ammonia is an attractive hydrogen carrier and potential fuel which could play a role in decarbonizing process heat, power or transport applications. However, the combustion properties of ammonia are disadvantageous for many technical proce…
View article: Experimental and numerical investigation of the induced ignition process in ammonia/air and ammonia/hydrogen/air mixtures
Experimental and numerical investigation of the induced ignition process in ammonia/air and ammonia/hydrogen/air mixtures Open
Ammonia is a prospective fuel for sustainable and clean combustion systems. However, its low reactivity makes ignition and stable combustion difficult, and H2 addition is considered as a means to enhance the combustion. This study addresse…
View article: Stochastic Modeling of Partially Stirred Reactor (PaSR) for the Investigation of the Turbulence-Chemistry Interaction for the Ammonia-Air Combustion
Stochastic Modeling of Partially Stirred Reactor (PaSR) for the Investigation of the Turbulence-Chemistry Interaction for the Ammonia-Air Combustion Open
The Partially Stirred Reactor (PaSR) model is carried out for the ammonia-air combustion system by means of stochastic modeling, namely by solving the transport equation for the joint Probability Density Function (PDF). The turbulent mixin…
View article: Autoignition Problem in Homogeneous Combustion Systems: GQL versus QSSA Combined with DRG
Autoignition Problem in Homogeneous Combustion Systems: GQL versus QSSA Combined with DRG Open
The global quasi-linearization (GQL) is used as a method to study and to reduce the complexity of mathematical models of mechanisms of chemical kinetics. Similar to standard methodologies, such as the quasi-steady-state assumption (QSSA), …
View article: Numerical Study on the Combustion Properties of Ammonia/DME and Ammonia/DMM Mixtures
Numerical Study on the Combustion Properties of Ammonia/DME and Ammonia/DMM Mixtures Open
Ammonia (NH3) is considered a promising zero-carbon fuel and was extensively studied recently. Mixing high-reactivity oxygenated fuels such as dimethyl ether (DME) or dimethoxymethane (DMM) with ammonia is a realistic approach to overcome …
View article: Numerical Investigation on the Head-on Quenching (HoQ) of Laminar Premixed Lean to Stoichiometric Ammonia–Hydrogen-Air Flames
Numerical Investigation on the Head-on Quenching (HoQ) of Laminar Premixed Lean to Stoichiometric Ammonia–Hydrogen-Air Flames Open
The Head-on Quenching (HoQ) of laminar premixed ammonia–hydrogen-air flames under lean to stoichiometric condition is numerical investigated. Detailed chemistry including 34 reactive species and detailed multi-component transport model inc…
View article: GQL-RedChem: A MatLAB-based tool for the model reduction for chemical kinetics based on the Global Quasi-linearization (GQL) approach
GQL-RedChem: A MatLAB-based tool for the model reduction for chemical kinetics based on the Global Quasi-linearization (GQL) approach Open
The Global Quasi-linearisation (GQL) approach has been developed for the dimension reduction of the chemical kinetics, which aim at speeding up the numerical simulation of reacting flows. GQL-RedChem is a MatLAB-based package that integrat…
View article: Combustion Characteristics of a Novel Ammonia Combustor equipped with Stratified Injection for Low Emissions
Combustion Characteristics of a Novel Ammonia Combustor equipped with Stratified Injection for Low Emissions Open
Ammonia – a carbon-free fuel- is being considered by various research groups and organizations as a potential alternative fuel to tackle some global warming issues of the 21st century. However, ammonia faces some challenges as a fuel, part…
View article: Numerical and Experimental Investigations of CH4/H2 Mixtures: Ignition Delay Times, Laminar Burning Velocity and Extinction Limits
Numerical and Experimental Investigations of CH4/H2 Mixtures: Ignition Delay Times, Laminar Burning Velocity and Extinction Limits Open
In this work, the influence of H2 addition on the auto-ignition and combustion properties of CH4 is investigated experimentally and numerically. Experimental ignition delay times (IDT) are compared with simulations and laminar burning velo…
View article: Intrinsic low-dimensional manifold (ILDM)-based concept for the coupling of turbulent mixing with manifold-based simplified chemistry for the turbulent flame simulation
Intrinsic low-dimensional manifold (ILDM)-based concept for the coupling of turbulent mixing with manifold-based simplified chemistry for the turbulent flame simulation Open
Manifold based simplified chemistry is an efficient reduction technique for the chemical kinetics, which aims to reduce the computational effort in numerical simulations. While the concept of reduced chemistry has been used for decades and…
View article: Combustion features of CH4/NH3/H2 ternary blends
Combustion features of CH4/NH3/H2 ternary blends Open
The use of so-called “green” hydrogen for decarbonisation of the energy and propulsion sectors has attracted considerable attention over the last couple of decades. Although advancements are achieved, hydrogen still presents some constrain…
View article: Implementation of the Scalar Dissipation Rate in the REDIM Concept and its Validation for the Piloted Non-Premixed Turbulent Jet Flames
Implementation of the Scalar Dissipation Rate in the REDIM Concept and its Validation for the Piloted Non-Premixed Turbulent Jet Flames Open
In order to address the impact of the concentration gradients on the chemistry – turbulence interaction in turbulent flames, the REDIM reduced chemistry is constructed incorporating the scalar dissipation rate, which is a key quantity desc…
View article: A novel model for incorporation of differential diffusion effects in PDF simulations of non-premixed turbulent flames based on reaction-diffusion manifolds (REDIM)
A novel model for incorporation of differential diffusion effects in PDF simulations of non-premixed turbulent flames based on reaction-diffusion manifolds (REDIM) Open
In this work, reaction-diffusion manifold (REDIM) reduced chemistry is used in the simulation of turbulent non-premixed flames based on a transported-probability density function model. Differential molecular diffusion is applied in the ge…
View article: Methane/Air Auto-Ignition Based on Global Quasi-Linearization (GQL) and Directed Relation Graph (DRG): Implementation and Comparison
Methane/Air Auto-Ignition Based on Global Quasi-Linearization (GQL) and Directed Relation Graph (DRG): Implementation and Comparison Open
In this work, two different reduction methods for simplification of chemical kinetics, the Global Quasi-linearization (GQL) and the Directed Relation Graph (DRG), are implemented and compared for ignition of CH 4/air homogeneous reacting s…
View article: Methane/Air Auto-Ignition Based on Global Quasi-Linearization (GQL) and Directed Relation Graph (DRG): Implementation and Comparison
Methane/Air Auto-Ignition Based on Global Quasi-Linearization (GQL) and Directed Relation Graph (DRG): Implementation and Comparison Open
In this work, two different reduction methods for simplification of chemical kinetics, the Global Quasi-linearization (GQL) and the Directed Relation Graph (DRG), are implemented and compared for ignition of CH 4/air homogeneous reacting s…